How do I calculate percentage of a number?

To calculate percentage of a number, multiply the number by the percentage and divide by 100. For example, 20% of 150 = (20 × 150) / 100 = 30. Or convert the percentage to decimal first: 20% = 0.20, then 0.20 × 150 = 30.

How do I calculate percentage increase?

Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, if a price increased from $50 to $65: ((65-50)/50) × 100 = 30% increase. Our percentage increase calculator does this automatically.

How do I calculate percentage decrease?

Percentage decrease = ((Old Value - New Value) / Old Value) × 100. For example, if a price dropped from $80 to $60: ((80-60)/80) × 100 = 25% decrease. Use our percentage decrease calculator for instant results.

How do I find what percent one number is of another?

To find what percent A is of B, divide A by B and multiply by 100. Formula: (A / B) × 100 = Percentage. For example, what percent is 25 of 200? (25/200) × 100 = 12.5%.

How do I calculate discount percentage?

Discount percentage = ((Original Price - Sale Price) / Original Price) × 100. For example, an item originally $100 now $75: ((100-75)/100) × 100 = 25% discount. Our discount percentage calculator shows this instantly.

How do I calculate percentage change between two numbers?

Percentage change = ((New - Old) / |Old|) × 100. Positive result means increase, negative means decrease. For example, from 40 to 50: ((50-40)/40) × 100 = 25% increase.

How do I convert percentage to decimal?

To convert percentage to decimal, divide by 100. Simply move the decimal point two places to the left. Examples: 25% = 0.25, 7.5% = 0.075, 150% = 1.50. Our percentage to decimal calculator does this instantly.

How do I convert decimal to percentage?

To convert decimal to percentage, multiply by 100. Simply move the decimal point two places to the right and add %. Examples: 0.45 = 45%, 0.08 = 8%, 1.25 = 125%.

How do I calculate profit percentage?

Profit percentage = ((Selling Price - Cost Price) / Cost Price) × 100. For example, bought for $80, sold for $100: ((100-80)/80) × 100 = 25% profit. Our percentage profit calculator handles this calculation.

How do I calculate grade percentage?

Grade percentage = (Points Earned / Total Points) × 100. For example, 85 points out of 100 = (85/100) × 100 = 85%. Our grade percentage calculator works for any scoring system.

How do I calculate tax percentage?

Tax amount = Price × (Tax Rate / 100). For example, 8% tax on $50: 50 × 0.08 = $4 tax. Total = $54. To find tax rate: (Tax Amount / Price) × 100.

What is the percentage formula?

The basic percentage formula is: Percentage = (Part / Whole) × 100. Variations include: Part = (Percentage × Whole) / 100, and Whole = (Part × 100) / Percentage. These cover all percentage calculations.

How do I calculate percentage in Excel?

In Excel, use formulas: For percentage of a number: =A1*B1/100 or =A1*B1%. For percentage change: =(New-Old)/Old. Format cells as Percentage (Ctrl+Shift+%) to display results with % symbol.

Is this the best free percentage calculator online?

Our percentage calculator handles all calculation types in one place: percent of a number, percentage increase/decrease, percentage change, and conversions. It's completely free, shows step-by-step solutions, and is considered one of the best free percentage calculator online options.

Percentage Calculator

Our comprehensive percentage calculator handles all percentage calculations in one place. Calculate what percent X is of Y, find percentage of a number, determine percentage increase or decrease between values, and more. Whether you need a discount percentage calculator, grade percentage calculator, or tax percentage calculator, this tool shows results with step-by-step explanations.

star 4.9 (8,547 ratings)

calendar_today Updated: March 2025

auto_awesome AI Insights AI

Hot

What is X% of Y?

Percentage

Value

Result

Formula

25% × 200 = 50

Steps

1. Convert 25% to decimal: 25 ÷ 100 = 0.25

2. Multiply: 0.25 × 200 = 50

As Decimal

0.25

As Fraction

1/4

auto_awesome AI Analysis

Calculation: 15% of 200 = 30

Method: Convert 15% to decimal (0.15), multiply by 200
Result: 0.15 × 200 = 30
Reverse check: 30 ÷ 200 = 0.15 = 15% ✓

Quick tip: To find 15% mentally, find 10% (20) + 5% (10) = 30

lightbulb Tips

•10% = move decimal one place left
•Percentage = (Part ÷ Whole) × 100
•To convert %→decimal: divide by 100
•Increase: Original × (1 + %/100)

functions Percentage Formulas

X% of Y

Y × (X / 100)

X is what % of Y

(X / Y) × 100

% Change

((New - Old) / Old) × 100

Increase by X%

Y × (1 + X/100)

Decrease by X%

Y × (1 - X/100)

How to Use This Calculator

calculate

Select Calculation Type

Choose what you want to calculate: percent of a number, what percent X is of Y, or percentage change.

edit

Enter Your Values

Input the numbers based on your selected calculation type.

check_circle

Get Instant Results

See your result with step-by-step explanation and alternative formats.

The Formula

Percentage represents a fraction of 100. To find what percent A is of B, divide A by B and multiply by 100. For percentage change, subtract the old value from new, divide by old, and multiply by 100.

Percentage = (Part / Whole) × 100%

lightbulb Variables Explained

Percentage The percent value (result)
Part The portion of the whole
Whole The total or base amount
Change % ((New - Old) / Old) × 100%

tips_and_updates Pro Tips

To convert percentage to decimal, divide by 100 (e.g., 25% = 0.25)

To convert decimal to percentage, multiply by 100 (e.g., 0.75 = 75%)

Percentage increase: ((New - Old) / Old) × 100

Percentage decrease: ((Old - New) / Old) × 100

For discounts: Sale Price = Original × (1 - Discount%/100)

Tip: 10% of any number is just moving the decimal one place left

To find what percent A is of B: (A ÷ B) × 100

Calculate Any Percentage Instantly

Our free percentage calculator handles all percentage calculations in one place. Whether you need to find percent of a number, calculate percentage increase or decrease, determine percentage change, or convert between percentages and decimals, this tool provides instant results with step-by-step explanations.

Percentage Increase & Decrease Calculator

Calculate percentage increase or decrease between any two values. Our percentage increase calculator and percentage decrease calculator show the exact change with the formula used. Perfect for tracking price changes, stock performance, sales growth, and more.

Discount Percentage Calculator

Quickly calculate discount percentages and sale prices. Enter original and sale prices to find the discount percentage, or enter a discount to calculate the final price. Essential for shopping, retail pricing, and promotional planning.

Grade & Score Percentage Calculator

Calculate your grade percentage from points earned and total points. Our grade percentage calculator works for tests, assignments, and overall course grades. Simply enter your score and the maximum possible score.

Percentage Converter

Convert between percentages, decimals, and fractions instantly. Our percentage to decimal calculator and decimal to percentage calculator show the conversion steps. Also includes fraction conversions for complete understanding.

Frequently Asked Questions

Related Tools

View all Financial View all arrow_forward

payments