Percentage calculator
Three quick sums: a percent of a number, what percent one number is of another, and the percentage change between two numbers. Free, no sign-up, nothing leaves your browser.
What is X% of Y?
X is what percent of Y?
Percentage increase or decrease
How to work out a percentage
To find a percent of a number, multiply the number by the percent and divide by 100. Fifteen percent of 80 is 80 times 15 divided by 100, which is 12.
Percentage increase and decrease
Take the old number from the new one, divide by the old number and multiply by 100. Going from 50 to 60 is a 20% increase. Going from 60 back to 50 is only a 16.7% decrease, because the starting number is different.
Where percentages matter in business
Margins, discounts, VAT, card fees and growth rates are all percentages. Try the profit margin calculator, the discount calculator or the VAT calculator.
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