Calculate percentages, percentage of a number, percentage change, and more. Perfect for math, finance, and everyday calculations.
Calculate percentages, changes, markups, discounts, and more with precision
Quick 10% Calculation
Move decimal point one place left
Quick 25% Calculation
Divide by 4
Quick 50% Calculation
Divide by 2
Quick 75% Calculation
Multiply by 3, divide by 4
A percentage is a way to express a number as a fraction of 100. It's represented by the symbol % and is commonly used to describe proportions, rates, and changes.
To calculate a percentage of a number, multiply the number by the percentage and divide by 100. For example, 25% of 80 = (25 × 80) ÷ 100 = 20.
To find what percentage one number is of another, divide the first number by the second number and multiply by 100. For example, 20 is what percent of 80? (20 ÷ 80) × 100 = 25%.
Percentage change = ((new value - old value) ÷ old value) × 100. A positive result indicates an increase, while a negative result indicates a decrease.
Percentage points measure the absolute difference between percentages, while percentages measure relative values. For example, going from 10% to 15% is a 5 percentage point increase, but a 50% increase.
To add a percentage, multiply by (1 + percentage/100). To subtract a percentage, multiply by (1 - percentage/100). For example, adding 20% to 100: 100 × 1.20 = 120.