All Calculators

Use our free retirement calculator to plan your financial future. Calculate how much you need to retire, see if you're on track, and find out when ...

Use our free investment calculator to see how your investments will grow over time. Calculate investment returns with compound interest, dividends,...

Use our free salary calculator to convert gross to net salary, hourly to annual pay, and see your take-home pay after taxes and deductions.

Use our free tax calculator to estimate your income tax, see your tax bracket, and calculate net salary after federal and state taxes with deductions.

Use our free savings calculator to see how your money will grow over time with compound interest. Calculate future value, monthly contributions nee...

Convert between 150+ world currencies with live exchange rates. Get real-time forex rates for USD, EUR, VND, GBP, JPY and more.

Use our free tip calculator to calculate tip amount, total bill with tip, and split among friends. Perfect for restaurants, delivery, hotels, and a...

Use our free discount calculator to calculate sale prices, discount percentages, and savings instantly. Works with single discounts, double discoun...

Use our free split bill calculator to divide expenses among friends. Split evenly or unevenly, add tip and tax, and see exactly what each person owes.

Use our free percentage calculator to calculate percent of a number, percentage increase, decrease, change, and difference instantly. Perfect for d...

Use our free profit margin calculator to calculate gross profit margin, markup percentage, and find selling price from cost. Perfect for business p...

Use our free amortization calculator to generate detailed loan payment schedules showing principal and interest breakdown for each payment. Works f...

Use our free VAT calculator to add VAT to a net price, remove VAT from a gross price, or calculate the VAT amount. Works with any VAT rate for UK, ...

Use our free loan calculator to calculate your monthly payment, EMI, and total interest for any loan. Works for personal loans, home loans, car loa...

Use our free interest calculator to calculate simple interest, compound interest, and total interest earned or paid. Works for savings accounts, lo...

Use our free ROI calculator to calculate return on investment for any investment type. Calculate ROI percentage, total profit, and annualized retur...

Use our free debt payoff calculator to create a personalized debt repayment plan. Compare debt snowball vs debt avalanche strategies, see how extra...

Calculate your monthly mortgage payment with down payment using our free home loan calculator. Get instant results for mortgage cost, interest rate...

Calculate your student loan monthly payment, total interest, and payoff date. Compare repayment plans side by side, see how extra payments save mon...

Calculate your personal loan monthly payment, total interest, and total cost including origination fees. Compare 24, 36, 48, and 60-month terms sid...

Plan your monthly budget using the 50/30/20 rule or other methods. Enter your after-tax income and see exactly how much to allocate for needs, want...

Calculate how much your car or truck loses in value each year. Choose from declining balance (realistic market), straight-line, MACRS tax depreciat...

Estimate the full cost of a college degree — tuition, housing, books, meals, and personal expenses — with annual inflation projections. See how...

Plan your wedding budget by category — venue, catering, photography, flowers, and more. Enter your total budget and guest count to get a personal...

Use our free car loan calculator to estimate your monthly car payment, loan amount, total interest, and total cost of ownership. Compare 36, 48, 60...

Use our free PayPal fee calculator to compute the exact PayPal transaction fee, net amount received, and the gross amount you need to charge to net...

Use our free FIRE calculator to find your Financial Independence, Retire Early number. Calculate your years to FIRE, monthly savings needed, and ex...

Use our free capital gains tax calculator to estimate federal and state tax on selling stocks, real estate, crypto, or other investments. Computes ...

Use our free auto loan calculator to estimate your monthly car payment, loan amount, total interest, and total cost of ownership. Compare 36, 48, 6...

Use our free credit card payoff calculator to see how long it takes to eliminate credit card debt, how much interest you'll pay, and what monthly p...

Use our free stock profit calculator to compute net profit, profit percentage, and total return from any stock trade. Includes commissions, dividen...

Use our free life insurance calculator to find out how much coverage you really need. Computes coverage three ways (income replacement, DIME method...

Convert an hourly wage to a full-year salary — or a salary to its equivalent hourly rate — instantly. Supports custom hours per week, weeks per...

Use our free health insurance calculator to estimate your total yearly cost including monthly premium, deductible, coinsurance, and out-of-pocket m...

Use our free down payment calculator to plan how much to save for a house. Enter the home price, target down payment percent, current savings, and ...

Use our free rent vs buy calculator to compare the true cost of renting versus buying a home over your planned stay, including opportunity cost, ap...

Use our free inflation calculator to see how inflation erodes purchasing power over time. Calculate past, present, and future value of money using ...

Use our free invoice calculator to add line items, apply discounts and tax, account for deposits, and compute the balance due. Includes a late paym...

Use our free net worth calculator to calculate your total net worth by adding up all assets and subtracting liabilities. Track your financial posit...

Use our free compound interest calculator to see how your investments grow over time with daily, monthly, quarterly, annual, or continuous compound...

Use our free break even calculator to find the break-even point in units and revenue from fixed costs, variable cost per unit, and price per unit. ...

Use our free emergency fund calculator to find out how much you need based on monthly expenses and job stability. See current progress, amount stil...

Use our free real estate tax calculator to estimate annual property tax, monthly property tax payment, and total real estate costs including transf...

Use our free closing cost calculator to estimate buyer or seller closing costs on a home purchase. Enter the home price, loan amount, select buyer ...

Use our free 401k calculator to project your 401(k) balance at retirement, including employer match, salary growth, and inflation. See how much you...

Use our free Stripe fee calculator to compute the exact Stripe processing fee, net amount received, and the gross amount you need to charge to net ...

Use our free refinance calculator to find out if refinancing your mortgage will save you money. Computes new monthly payment, monthly savings, brea...

Use our free dividend yield calculator to compute annual dividend yield, total dividend income, and per-payment amount for any dividend-paying stoc...

Use our free cap rate calculator to compute the capitalization rate, net operating income (NOI), gross rent multiplier, and operating expense ratio...

Use our free car insurance calculator to estimate your monthly and annual premium based on driver age, vehicle value, driving record, coverage type...

Use our free home insurance calculator to estimate dwelling coverage, personal property, liability, and annual premium based on rebuild cost, squar...

Use our free P/E ratio calculator to compute price-to-earnings ratio, earnings yield, and PEG ratio for any stock. Compare against industry average...

Use our free marginal tax rate calculator to find your 2024 federal tax bracket, marginal rate, effective rate, and take-home pay. Includes a compl...

Use our free home buying cost calculator to estimate the total upfront cash you need to buy a house, including down payment, closing costs, inspect...

Use our free mortgage affordability calculator to find out how much house you can afford. Enter your annual income, monthly debts, down payment per...

Compute the present value, future value, or periodic payment of an annuity. Supports ordinary annuities (payment at end of period) and annuities du...

Use our free Roth IRA calculator to project your tax-free retirement balance. Enter your age, annual contribution, expected return, and see the pow...

Use our free home selling cost calculator to estimate total selling costs and net proceeds. Includes agent commission (5-6%), closing costs, repair...

Use our free WACC calculator to compute weighted average cost of capital from market values of equity and debt, cost of equity (direct or CAPM-deri...

Use our 401k match calculator to see exactly how much your employer will contribute to your 401(k), whether you're capturing the full match, and ho...

Use our free beta calculator to compute stock beta from 3 methods: historical returns dataset, covariance/variance directly, or convert unlevered b...

Use our free cash on cash return calculator to compute the actual return on the cash you invest in a rental property. Includes mortgage payments, d...

Use our free effective tax rate calculator to find your overall tax burden as a percentage of gross income. Includes federal, state, local income t...

Use our free debt to equity ratio calculator to compute D/E, debt ratio, equity ratio, and financial leverage from a company's balance sheet. Inclu...

Use our free CAGR calculator to compute the compound annual growth rate of any investment, stock, or business metric. Enter beginning value, ending...

Use our free current ratio calculator to assess a company's short-term liquidity. Computes current ratio, working capital, quick ratio (acid test),...

Use our free inheritance tax calculator to estimate federal estate tax based on estate value, debts, charitable contributions, and state inheritanc...

Use our free Sharpe Ratio calculator to measure risk-adjusted return for portfolios, funds, and investments. Computes excess return over risk-free ...

Use our free Traditional IRA calculator to project your tax-deferred retirement balance. Enter your age, annual contribution, expected return, and ...

Use our free rental yield calculator to compute gross and net rental yield, plus cash yield after mortgage payments. Perfect for buy-to-let investo...

Use our free disability insurance calculator to figure out how much income protection you need and what it will cost. Computes monthly benefit, tot...

Use our free NPV calculator to compute net present value, discounted cash flow, profitability index, and payback period for any project or investme...

Use our free quick ratio (acid test) calculator to measure a company's ability to meet short-term obligations using only liquid assets — cash, ma...

Use our free corporate tax calculator to estimate federal and state corporate income tax based on revenue, expenses, depreciation, and deductions. ...

Use our free bond yield calculator to compute current yield, yield to maturity (YTM), and total return on any coupon bond. Enter face value, coupon...

Use our free IRR calculator to compute the internal rate of return for any project or investment. Enter initial investment and yearly cash flows to...

Use our free inventory turnover calculator to measure how efficiently your business manages inventory. Computes turnover ratio and Days Inventory O...

Use our free money transfer fee calculator to find the true all-in cost of an international transfer. Combines flat fees, percentage fees, receivin...

Use our free property value calculator to estimate fair market value using the three standard appraisal approaches: income, sales comparison, and c...

Use our free unemployment insurance calculator to estimate your weekly state UI benefit. Computes the standard 50% wage replacement, applies state-...

Use our free Cash Conversion Cycle (CCC) calculator to measure how long your cash is tied up in operations. Inputs: DIO + DSO − DPO directly, or ...

Use our free currency hedging calculator to size your forex hedge, estimate hedge cost, and compare hedged versus unhedged outcomes. Built for impo...

Use our free import export cost calculator to compute total landed cost of an international shipment. Includes FOB, freight, insurance, CIF, duty, ...

Use our free inflation-adjusted return calculator to find your real rate of return after accounting for inflation. Computes both the Fisher equatio...

Use our free purchasing power calculator to see how inflation erodes the real value of money over time. Convert between past, present, and future p...

Use our free insurance deductible calculator to compare high-deductible and low-deductible plans. Computes break-even claim years, expected total c...

Use our free cross rate calculator to derive any forex cross currency rate from two quoted pairs. Built for FX traders, treasurers, and importers w...

Use our free gross rent multiplier (GRM) calculator to quickly screen rental property investments. Computes GRM from price and gross rent, effectiv...

Use our free import export tax calculator to compute customs duty and VAT on international shipments. Uses standard CIF-based duty assessment plus ...

Use our free real interest rate calculator with the Fisher equation to convert nominal interest into inflation-adjusted real returns. Find out what...

Use our free forward rate calculator to price an FX forward contract using interest rate parity. Enter the spot rate, domestic and foreign interest...

Use our free road tax calculator to estimate annual vehicle tax in the UK, Germany, France, or US based on engine size, CO2 emissions, weight, and ...

Use our free travel insurance calculator to estimate the premium for any trip. Factors in age, destination, trip cost, duration, coverage level, an...

Use our free Economic Value Added (EVA) calculator to determine if a business is creating or destroying shareholder value. Computes EVA = NOPAT −...

Convert between different units of measurement including length, weight, temperature, volume, area, speed, time, data storage, energy, and pressure.

A full-featured scientific calculator with trigonometry, logarithms, exponents, roots, factorials, and more. Supports degrees/radians and shows ste...

Calculate the average (mean), median, mode, range, and other statistics for any set of numbers. Supports weighted averages and step-by-step explana...

Solve quadratic equations (ax² + bx + c = 0) instantly. Find real and complex roots, discriminant, vertex, and axis of symmetry with detailed step...

Add, subtract, multiply, and divide fractions with ease. Simplify fractions, convert to decimals or percentages, and see step-by-step solutions.

Calculate, simplify, and solve ratios and proportions. Find equivalent ratios, convert to fractions or percentages, and compare ratios with step-by...

Calculate the area of any shape instantly. Find area of triangles, circles, rectangles, squares, trapezoids, ellipses and more with step-by-step fo...

Generate random numbers between any two values. Supports multiple numbers, no duplicates option, integers or decimals. Perfect for raffles, games, ...

Solve any triangle by entering sides and angles. Calculate area, perimeter, height, angles, and identify triangle type. Uses Law of Sines, Law of C...

Calculate the hours and minutes between two times. Perfect for work hours, payroll calculations, timesheets, and shift scheduling. Supports break d...

Calculate powers and exponents including squares, cubes, negative exponents, and fractional powers. Get step-by-step solutions with exponent rules ...

Calculate the Least Common Multiple (LCM) and Greatest Common Divisor (GCD/HCF) of two or more numbers. See step-by-step solutions using Euclidean ...

Check if a number is prime, find prime factors, generate prime numbers in a range, and discover the next or previous prime. Get step-by-step primal...

Calculate logarithms with any base, natural log (ln), log base 10, log base 2, and antilog. Get step-by-step solutions and learn how logarithms work.

Convert numbers between Binary (base 2), Octal (base 8), Decimal (base 10), Hexadecimal (base 16), and any base from 2-36. See step-by-step convers...

Calculate Fibonacci numbers, generate sequences, check if a number is Fibonacci, and explore the golden ratio. See step-by-step solutions with mult...

Calculate factorial (n!), double factorial (n!!), permutations (nPr), and combinations (nCr). See step-by-step solutions with formulas and explanat...

Calculate speed, distance, or time using the fundamental motion formula. Convert between units like km/h, mph, and m/s. Perfect for travel planning...

Calculate the distance between two points in 2D, 3D, or on a map using latitude and longitude. Supports Euclidean, Manhattan, and great-circle (Hav...

Calculate standard deviation, variance, and mean from your data set with step-by-step explanation. Supports both sample and population standard dev...

Perform decimal arithmetic and convert between decimals, fractions, and percentages. Handles repeating decimals with step-by-step solutions.

Calculate z-scores, percentiles, and probabilities from raw scores, mean, and standard deviation. Includes normal distribution visualization and re...

Calculate derivatives of any function with step-by-step solutions. Supports polynomials, trigonometric, exponential, and logarithmic functions. Fin...

Add, subtract, or find the difference between times in hours, minutes, and seconds. Supports HH:MM:SS format, AM/PM clock times, work hours with br...

Compute definite and indefinite integrals with step-by-step solutions. Enter any expression to find its antiderivative symbolically, or evaluate a ...

Calculate probabilities for any scenario with step-by-step solutions. Supports basic, conditional, binomial, dice, and card probability calculation...

Perform all matrix operations with step-by-step solutions. Add, subtract, multiply matrices, find the determinant, inverse, transpose, and row-redu...

Check if any year is a leap year, find the next or previous leap year, or list all leap years within a date range. Explains the full Gregorian cale...

Calculate permutations (nPr) and combinations (nCr) instantly. Supports both with and without repetition, shows step-by-step factorial breakdowns, ...

Free circle calculator — enter any one value (radius, diameter, circumference, or area) and instantly get the other three, plus sector, arc, and ...

Evaluate, simplify, and analyze boolean expressions with step-by-step solutions. Generate truth tables, find minterms and maxterms, create SOP/POS ...

Perform all complex number operations with step-by-step solutions. Add, subtract, multiply, divide complex numbers, find modulus, argument, conjuga...

Evaluate the limit of any function numerically. Enter a function expression, choose the variable, the value it approaches, and the direction. See t...

Calculate the perimeter of any shape including rectangle, square, triangle, circle, parallelogram, trapezoid, ellipse, rhombus, and regular polygon...

Free descriptive statistics calculator. Enter your data set and instantly compute count, mean, median, mode, standard deviation, variance, quartile...

Solve the Pythagorean theorem (a² + b² = c²) instantly. Find the hypotenuse, missing leg, or compute the 2D distance between two points with ste...

Calculate the volume and surface area of any 3D shape including cube, sphere, cylinder, cone, pyramid, prism, ellipsoid, and torus. See step-by-ste...

Calculate a mod b — the remainder when dividing a (dividend) by b (divisor). Supports integers and decimals, and shows both math (floored, non-ne...

Calculate the determinant of any square matrix up to 5×5 with detailed step-by-step cofactor expansion. Instantly check whether a matrix is singul...

Calculate with mixed numbers instantly. Add, subtract, multiply, and divide mixed fractions with step-by-step solutions. Convert between mixed numb...

Convert between decimal, scientific notation (m × 10^n), engineering notation, and E-notation. Counts significant figures and shows the order of m...

Calculate your Body Mass Index (BMI), check where you fall on the BMI chart, find your ideal weight range, and understand what your BMI means for y...

Calculate your pregnancy due date, find out how many weeks pregnant you are, track your pregnancy timeline week by week, and estimate conception da...

Calculate your ovulation date, predict your fertile window, and find the best days to conceive based on your menstrual cycle. Track multiple cycles...

Calculate the best times to sleep and wake up based on 90-minute sleep cycles. Find your optimal bedtime to wake up refreshed, or discover when to ...

Calculate your optimal daily water intake based on body weight, activity level, and climate. Get personalized hydration recommendations to stay hea...

Calculate your daily macronutrient needs (protein, carbs, fat) based on your TDEE, body composition, and fitness goals. Get personalized macro spli...

Calculate how many calories you should eat per day for weight loss, muscle gain, or maintenance. Our free calorie calculator uses BMR and TDEE to g...

Calculate your optimal daily protein intake based on body weight, activity level, and fitness goals. Get personalized protein recommendations for m...

Calculate your body fat percentage using the accurate Navy method with waist and neck measurements. Find your lean body mass, fat mass, and see how...

Calculate your ideal body weight based on height, age, and gender. Our free ideal weight calculator uses multiple scientific formulas (Devine, Robi...

Calculate your Total Daily Energy Expenditure (TDEE) to know exactly how many calories you burn each day. Essential for weight loss, muscle gain, o...

Calculate your Basal Metabolic Rate (BMR) - the number of calories your body burns at rest. Use multiple formulas including Mifflin-St Jeor and Har...

Calculate your intermittent fasting schedule for 16:8, 18:6, 20:4, or OMAD protocols. Enter your last meal time to get your eating window, fasting ...

Predict your next period, track your menstrual cycle, and identify your fertile window. Enter your last period date and average cycle length for pe...

Calculate your estimated blood alcohol content (BAC) based on weight, gender, number of drinks, and time elapsed. See how long until you're sober a...

Calculate your running pace, finish time, or distance instantly. Enter any two values to find the third. Includes race finish time predictions for ...

Calculate TDEE, calorie deficit or surplus, and macro targets (protein/carbs/fat) for cutting, lean bulk, or recomp. Choose mild, moderate, or aggr...

Convert your dog's age to human-equivalent years using the 2019 Cell Systems (Wang et al.) epigenetic formula, adjusted for size. Includes life sta...

Use our free calories burned calculator to estimate calories burned during 25+ exercises and activities. Uses scientifically-accurate MET values. E...

Use our free blood pressure calculator to interpret your BP reading. Get the AHA 2017 category (Normal, Elevated, Hypertension Stage 1/2, Crisis), ...

Convert your cat's age into human years using the AAHA (American Animal Hospital Association) standard formula. Get life stage (kitten, junior, adu...

Estimate your one rep max (1RM) from any submaximal lift using the Epley, Brzycki, or Lombardi formula — plus a full percentage training chart sh...

Free heart rate calculator using the Karvonen formula. Calculate your max heart rate (MHR), heart rate reserve, and 5 target training zones for fat...

Calculate your ideal calorie cycling plan for body recomposition. Get separate training day and rest day calories with optimized macro splits to bu...

Use our free max heart rate calculator with 4 proven formulas (Tanaka, Fox, Gulati for women, Nes) plus 5 training zones for fat burn, cardio, and ...

Track your daily caffeine intake from coffee, tea, and energy drinks. Calculate caffeine half-life decay, time to clear your system, and compare ag...

Use our free heart rate zone calculator with the Karvonen formula to compute 5 training zones (Recovery, Fat Burn, Aerobic, Threshold, Maximum) fro...

Use our free VO2 max calculator to estimate your maximum oxygen uptake using 4 validated test methods: Cooper 12-minute run, Rockport 1-mile walk, ...

Free LDL cholesterol calculator that analyzes your lipid panel: computes LDL via the Friedewald equation, derives non-HDL cholesterol and total/HDL...

Use our free blood sugar calculator to convert glucose readings between mg/dL and mmol/L, estimate A1C from average glucose, and classify your read...

Use our free cardiovascular risk calculator to estimate your 10-year risk of heart attack or stroke based on age, sex, cholesterol, blood pressure,...

Use our free pregnancy weight gain calculator to track healthy weight gain based on pre-pregnancy BMI, current week, and singleton or twin pregnanc...

Use our free waist-hip ratio (WHR) calculator to assess body fat distribution and metabolic risk. Computes WHR and waist-to-height ratio, classifie...

Use our free vitamin and mineral calculator to look up the daily Recommended Dietary Allowance (RDA) for all 13 essential vitamins and 12 essential...

Use our free waist to height ratio (WHtR) calculator to assess central obesity and cardiometabolic risk. Accepts cm or inches, shows your healthy w...

Use our free sodium calculator to find your daily sodium limit per FDA and AHA guidelines, adjusted for hypertension, kidney disease, age, and athl...

Use our free carbohydrate calculator to determine your optimal daily carb intake based on body weight, total calories, activity level, and goal (lo...

Use our free muscle mass calculator to estimate skeletal muscle mass and skeletal muscle mass index (SMI) using the Lee 2000 equation. Screens for ...

Use our free lean body mass (LBM) calculator with three formulas — Boer, James, and Hume — plus body-fat-based calculation if you know your BF%...

Use our free fiber calculator to determine your daily fiber recommendation based on age, sex, and calorie intake. Returns total, soluble, and insol...

Use our free fat intake calculator to compute your daily fat grams based on calorie needs and goals. Covers total, saturated, unsaturated, and omeg...

Use our free EKG calculator to compute QTc using both Bazett and Fridericia formulas, derive heart rate from RR interval, and classify PR and QRS d...

Use our free stroke volume calculator to compute SV from end-diastolic and end-systolic volumes (or from cardiac output and heart rate) plus ejecti...

Use our free cardiac output calculator to compute heart output in L/min from heart rate and stroke volume. Optionally includes cardiac index normal...

Use our free rest time calculator to find the optimal rest period between sets based on your training goal (strength, hypertrophy, endurance, or po...

Calculate your vehicle's fuel consumption, trip cost, and CO2 emissions. Supports both metric (L/100km) and imperial (MPG) units with fuel cost est...

Calculate solar panel system size, daily energy output, number of panels needed, and estimate potential energy savings. Essential for planning sola...

Calculate stair dimensions including rise, run, number of steps, stringer length, and angle. Design safe, code-compliant stairs for decks, interior...

Calculate voltage drop in electrical wiring for single-phase and three-phase circuits. Determine if wire size meets NEC 3% voltage drop recommendat...

Calculate total resistance for series and parallel resistor circuits, decode 4-band and 5-band resistor color codes, and solve for resistance using...

Calculate electrical power, current, voltage, or resistance from any two known values. Supports DC circuits, single-phase AC, and three-phase AC sy...

Calculate concrete volume and materials needed for your construction project. Supports slabs, footings, columns, and custom shapes with material br...

Calculate air flow rate (CFM), duct velocity, and duct sizing for HVAC systems. Determine ventilation requirements and optimize duct design.

Calculate battery capacity, runtime, charging time, and battery bank sizing. Supports multiple battery types including lithium-ion, lead-acid, and ...

Calculate heat transfer through materials using conduction, convection, and radiation formulas. Determine R-value, U-value, and heat loss for build...

Calculate torque from force and lever arm distance, convert between torque units, and calculate power from torque and RPM.

Calculate resonant frequency for LC circuits, RLC circuits (with Q factor and bandwidth), and mechanical spring-mass systems. Supports multiple uni...

Calculate force using Newton's second law (F=ma), net force from multiple forces, weight, friction, centripetal force, spring force (Hooke's Law), ...

Calculate roof pitch from rise and run, convert pitch to degrees, find rafter length, and determine the slope percentage. Essential for roofing, fr...

Calculate HVAC heating and cooling load requirements using Manual J simplified methodology. Determine BTU capacity, tonnage, and system sizing base...

Calculate the correct wire size for your electrical installation. Find AWG or metric wire gauge based on current, voltage, and distance with voltag...

Calculate EV charging time, cost, and energy usage for any electric vehicle. Compare Level 1, Level 2, and DC fast charging speeds with your electr...

Free Ohm's Law calculator. Solve for voltage (V), current (I), resistance (R), or power (P) using V=IR and P=VI. Interactive Ohm's Law wheel, insta...

Calculate beam deflection, bending stress, and maximum load capacity for simply supported and cantilever beams. Supports wood and steel beam analysis.

Calculate exactly how much paint you need for any interior or exterior project. Enter room dimensions, doors, windows, and coats — get gallons or...

Calculate the correct HVAC duct size based on airflow (CFM), velocity, and duct type. Supports round, rectangular, and oval duct calculations with ...

Calculate normal stress (σ = F/A), shear stress (τ = V/A), bending stress (σ = Mc/I), strain (ε = σ/E), and factor of safety for structural an...

Calculate gear ratios, output speed, and torque multiplication for gear trains, sprockets, pulleys, and transmissions. Supports single and compound...

Calculate subnet mask, network address, broadcast address, host range, and usable hosts from any IPv4 CIDR notation. Includes wildcard mask, binary...

Calculate fluid flow rate, velocity, pressure drop, and Reynolds number for pipes. Determine if flow is laminar or turbulent and estimate head loss.

Calculate exactly how many tiles you need for any floor, wall, bathroom or backsplash project. Enter room dimensions, tile size, grout joint width ...

Calculate velocity, speed, distance, or time using v = d/t. Solve all four kinematic equations with unit conversion between m/s, km/h, mph, and ft/s.

Calculate kinetic energy (KE = ½mv²) for any object given its mass and velocity, or solve the equation backwards for mass or velocity. Supports t...

Calculate electricity costs for any appliance based on wattage, usage hours, and your electricity rate. Estimate daily, monthly, and yearly energy ...

Calculate pressure using force and area (P = F/A), fluid pressure by depth (P = ρgh), or convert between psi, bar, kPa, MPa, atm, and torr.

Calculate exactly how much mulch you need for any garden bed, tree ring, flower border or playground. Enter the bed dimensions, mulch depth and bag...

Calculate gravitational potential energy (PE = mgh) or elastic potential energy (PE = ½kx²). Solve for any variable: energy, mass, height, gravit...

Calculate power factor, real power (kW), reactive power (kVAR), apparent power (kVA), and capacitor sizing for power factor correction in AC electr...

Calculate posts, panels, gates, concrete and total cost for any residential or commercial fence project. Enter linear feet, post spacing, gate coun...

Calculate projectile motion parameters: range, maximum height, time of flight, and trajectory. Enter initial velocity and launch angle to get full ...

Calculate exactly how much carpet you need for any room or commercial space. Enter room dimensions and waste factor — get square footage, square ...

Use our free square footage calculator to compute the area of any room or space in square feet. Supports rectangle, triangle, circle, and trapezoid...

Calculate RPM (revolutions per minute) for pulley systems, gear drives, and rotating belts or wheels. Solve for any unknown: driver or driven RPM, ...

Convert between frequency, wavelength, wave speed and period for any wave type. Supports light, sound, radio waves and custom media. Shows full wav...

Estimate and compare cloud computing costs across AWS, Azure, and GCP. Calculate pricing for compute instances, storage, data transfer, and serverl...

Calculate RC circuit time constant (τ), cutoff frequency, capacitor charge/discharge time, and voltage at any time point. Supports low-pass and hi...

Use our free capacitance calculator for parallel-plate capacitors, series and parallel combinations, RC time constants, and stored energy calculati...

Use our free engineering tolerance calculator to compute dimensional limits, tolerance width, and shaft/hole fit type (clearance, transition, or in...

Calculate your final grade, current course grade, or what score you need on your final exam. Supports weighted assignments, multiple categories, an...

Calculate your GPA (Grade Point Average) for high school or college. Supports weighted and unweighted calculations, multiple grading scales, and cu...

Enter your current course grade, the final exam weight, and the grade you want — instantly see the exact score you need on the final exam to hit ...

Convert CGPA to percentage (and back) using the 10-point, 7-point, or 4-point scale with CBSE × 9.5, × 10, or a custom multiplier. Returns equiva...

Convert scores between IELTS, TOEFL iBT, PTE Academic, Duolingo English Test, and CEFR levels. Uses official ETS concordance tables and verified da...

Calculate future college cost, project 529 plan growth with tax-free compounding, and see exactly how much you need to contribute each month to clo...

Estimate your Digital SAT total score (400-1600), section scores, and percentile from raw correct answers. Includes a superscore calculator for com...

Use our free language proficiency calculator to estimate your CEFR level (A1-C2) plus IELTS and TOEFL score equivalents based on your vocabulary si...

Calculate your exact age in years, months, and days from your date of birth. Find out how old you are today, your age in days, weeks, hours, and co...

Calculate days between two dates, add or subtract days from a date, find business days excluding weekends, and get accurate date differences in yea...

Convert time between different time zones instantly. Compare multiple cities, plan international meetings, and see current time around the world wi...

Count words, characters, sentences, paragraphs, and estimate reading time instantly. Live updates as you type. Supports with/without spaces, readab...

Check how strong your password is with our free password strength calculator. See entropy bits, estimated crack time, and get personalized tips to ...

Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more — instantl...

Convert Unix timestamps to human-readable dates and dates to Unix timestamps instantly. Shows current time, supports seconds and milliseconds, UTC ...

Decode and inspect JWT tokens instantly. View header, payload, claims, expiration time, and issued time. Color-coded display of all three JWT parts...

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text instantly. Compare hash values, copy results, and verify data integrity. All processing ...

Encode or decode URLs, query strings, and special characters instantly. Supports percent encoding (RFC 3986), UTF-8, component encoding, and full U...

Test and debug regular expressions with live match highlighting, capture groups, flags support, and replace mode. Essential developer tool for buil...

Encode text to Base64 or decode Base64 to readable text instantly. Supports standard and URL-safe Base64, UTF-8, and one-click copy. All processing...

Format, validate, and minify JSON online. Pretty print with customizable indentation, syntax highlighting, error detection, and copy-to-clipboard. ...

Parse and translate cron expressions to human-readable text instantly. See next run times, validate syntax, and understand each field. Supports sta...

Calculate AI token count, cost, and usage for OpenAI GPT-4o, Claude, Gemini, and other LLMs. Convert words to tokens, estimate API costs, and compa...

Generate QR codes instantly for URLs, text, WiFi credentials, email, phone numbers, and vCards. Customize colors, size, and error correction level....

Compare two pieces of text, code, JSON, YAML or any plain-text file side by side. The diff checker highlights added, removed and changed lines with...

Convert Markdown to clean HTML instantly with GitHub Flavored Markdown support, live side-by-side preview, and one-click copy. Pure client-side ren...

A generic cost and price calculator with three modes. Find the price per unit and compare two products side by side, estimate total cost including ...

Use our free working days calculator to count the number of business days between two dates or add a specific number of business days to a start da...

Calculate aspect ratios from pixel dimensions, find missing width or height, and resize images while preserving proportions. Includes presets for Y...

Convert JSON to YAML online — fast, free, browser-side. Paste JSON, get clean YAML with correct indentation, type preservation, and quoting for a...

Convert CSV to JSON online — fast, free, browser-side. Paste CSV, get clean JSON arrays with type-correct values, automatic header detection, RFC...

Convert YAML to JSON online — fast, free, browser-side. Paste any YAML and get clean JSON with type-correct numbers, booleans, null, arrays, and ...

Convert numbers between binary, decimal, hexadecimal, and octal. Perform binary arithmetic and bitwise operations with step-by-step explanations.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Also calculate temperature differences and thermal expansion (ΔL = α·L₀·�...

Convert colors between HEX, RGB, HSL, HSV, and CMYK formats instantly. Live color preview, one-click copy, and built-in color picker for designers ...

Convert between all digital data units instantly — bits, bytes, KB, MB, GB, TB, PB and binary IEC units (KiB, MiB, GiB, TiB). Enter any value in ...

Convert between running pace and speed instantly. Supports min/km, min/mile, km/h, and mph — enter any value and see all four equivalents plus a ...

Convert between bandwidth units (Mbps, MBps, Gbps, Kbps, Tbps) and calculate file download times based on your internet speed. Includes streaming s...

Convert between cups, tablespoons, teaspoons, mL, fluid ounces, grams, and more. Get accurate weight conversions for common baking ingredients like...

Convert between every common length unit instantly — mm, cm, m, km, inches, feet, yards, miles, nautical miles, micrometers, nanometers, furlongs...

Use our free shoe size converter to instantly convert between US, EU, UK, and JP (CM) shoe sizes for men, women, and kids. See all equivalent sizes...

Convert between every common weight and mass unit instantly — kilograms, grams, milligrams, micrograms, metric tons, pounds, ounces, stone, US to...

Convert between every common volume unit — millilitres, litres, cubic metres and centimetres, US and UK gallons, cups, pints, quarts, fluid ounce...

Convert between every common speed unit — m/s, km/h, mph, knots, ft/s, ft/min, and Mach. Bidirectional conversion with a common-equivalents grid ...

A fully-featured Pomodoro timer with customizable work/break durations, visual progress ring, session counter, daily focus stats, alarm sound, and ...

Calculate travel time from distance and speed, find your arrival time from a departure time, or solve for any variable in the speed-distance-time r...

Free online countdown timer with alarm sound, full-screen mode, and event date countdown. Set any duration in hours, minutes, and seconds. Perfect ...

Estimate the full cost of any trip — road trips, flights, or vacations. Enter your travel details to get a complete cost breakdown by category an...

Enter your birthday to instantly discover your Western zodiac sun sign and Chinese zodiac animal. Get your element, ruling planet, key personality ...

Plan your study schedule by deadline, estimate total exam prep hours by topic difficulty and knowledge level, or break today's study time into focu...

Estimate your CO2 carbon footprint from driving, flights, and home energy use. Get a full emissions breakdown by category and see how many trees it...

Free online typing speed test to measure your words per minute (WPM) and accuracy. Choose from 1, 2, 3, or 5 minute timed tests or paragraph mode. ...

Generate strong, random passwords instantly. Choose your length and character types — uppercase, lowercase, numbers, and symbols. Includes real-t...

Calculate when you'll finish a program, course, or project. Enter total hours needed and weekly availability to get your estimated completion date ...

Generate UUIDs (Universally Unique Identifiers) instantly — v4 random, v1 timestamp, v7 sortable, or nil. Bulk generate up to 100 at once with fo...

Estimate how long it takes to read any text. Paste your content or enter a word count, pick a reading speed (WPM), and get instant reading time plu...

Flip a virtual coin once or 10,000 times. See live heads/tails counts, probability charts, and exact binomial probability for N heads in M flips �...