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Calculate your monthly mortgage payment with down payment using our free home loan calculator. Ge...
Add, subtract, or find the difference between times in hours, minutes, and seconds. Supports HH:M...
Calculate your Body Mass Index (BMI), check where you fall on the BMI chart, find your ideal weig...
A full-featured scientific calculator with trigonometry, logarithms, exponents, roots, factorials...
Convert between different units of measurement including length, weight, temperature, volume, are...
Use our free percentage calculator to calculate percent of a number, percentage increase, decreas...
Calculate your GPA (Grade Point Average) for high school or college. Supports weighted and unweig...
Use our free compound interest calculator to see how your investments grow over time with daily, ...
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Math
Filling a pool, sizing an aquarium, or ordering heating oil? Tank volume is just the volume of a cylinder or box converted into the capacity units you actually buy in — gallons and litres. This guide covers the formulas for cylindrical and rectangular tanks, the cubic-foot-to-gallon conversions, partially full horizontal tanks, pool and aquarium volume, and the five mistakes that throw the numbers off.
Timer
Adding 45 minutes and 30 minutes isn't 75 — it's 1 hour 15. Time looks like ordinary arithmetic but runs in base 60, and that mismatch is why hours-and-minutes math trips everyone up. This guide breaks down how to add, subtract, and convert time correctly by hand, where the carry and the borrow really go, and the minutes-to-decimal-hours conversion that quietly breaks payroll.
Math
A magnitude-6 earthquake isn't 50% worse than a magnitude-4 — it's 100 times stronger. Earthquakes, sound, acidity, starlight, music, and even your own senses all run on logarithmic scales that compress enormous ranges into small numbers. This is the intuition behind logarithms: not how to compute them, but why so much of reality multiplies instead of adds.
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