Percentage Calculator
Work out a percentage of a number, what percent one number is of another, a percent increase or decrease, or the price after a discount. Results update as you type.
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How to use the percentage calculator
Pick what you want to work out from the menu, then fill in the two boxes. The answer appears instantly — there's no button to press and nothing is sent anywhere.
What is X% of a number? Use this for tips, sales tax, or "20% of 150." Enter the percent and the number, and you get the amount.
X is what percent of a number? Use this to turn a score or a part into a percentage — for example, "30 out of 120 is 25%."
Percent increase or decrease. Enter a starting value and a new value to see how much it went up or down in percent — handy for price changes, raises, or test scores.
Discount / percent off. Enter a price and the percent off to see the final price and how much you save.
Everything runs in your browser — the numbers you type are never uploaded.
Common percentage questions
How do I find a percentage of a number? Multiply the number by the percent, then divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I work out what percent one number is of another? Divide the first number by the second, then multiply by 100. For example, 30 ÷ 120 × 100 = 25%.
How do I calculate a percent increase? Subtract the old value from the new value, divide by the old value, then multiply by 100. Going from 100 to 125 is a 25% increase.
How do I work out a price after a discount? Multiply the price by the percent off and divide by 100 to get the savings, then subtract that from the price. $80 with 25% off becomes $60, saving $20.
How do I calculate a percent decrease? Subtract the new value from the old value, divide by the old value, then multiply by 100. Going from 200 to 150 is a 25% decrease. Use the percent increase or decrease option and the tool shows a drop as a negative change.