Percentage Calculator
Work out X% of a number, what percent one number is of another, the whole from a part, the percentage change, or a price with or before tax or a discount.
Runs in your browser. Nothing you enter is uploaded.
How to use
This calculator works out the six sums people most often need percentages for, and shows how each answer was reached.
- Percentage of a number: 25% of 200 is 50. Use it for a tip, a share, or how much a discount saves.
- What percent one number is of another: 25 out of 200 is 12.5%. Use it for a test score or a share of a budget.
- The whole, from a part: 15 is 20% of 75. Use it when you know a share and its percentage, such as a 15 deposit that is 20% of the price.
- Percentage change: from 80 to 100 is an increase of 25%, and from 100 to 80 a decrease of 20%.
- Add or take off a percentage: choose Add for a price with tax, such as 100 with 21% added, 121, or Take off for a discount, such as 30% off 60, 42.
- Before tax or a discount: 121 is up 21% from 100, the price before 21% tax. Choose down for a discount: 42 is down 30% from 60. Taking 21% off 121 gives 95.59, which is too little, as the tax was a share of the smaller number.
Answers appear as you type, with the working underneath, and Copy copies an answer. Type numbers with a point or a comma for decimals (12.5 or 12,5), with or without separators between thousands. Answers are written the way your device writes numbers.
A percentage change and a difference in percentage points aren't the same: a rate going from 10% to 12% is 2 points higher, but a 20% increase.
Frequently asked questions
How do I work out a percentage increase?
Take the old number from the new one, divide by the old number, and multiply by 100. From 80 to 100: 20 ÷ 80 × 100 = 25%. Type both numbers under Percentage change to do it here.
Why is a 50% rise followed by a 50% fall not back where it started?
The fall is a share of the larger number. 100 up 50% is 150, and 50% off 150 is 75. Each percentage is of the number at that moment.
How do I find the price before tax?
Divide the price with tax by 1 plus the rate: with 21% tax, 121 ÷ 1.21 = 100. Type 121 and 21 under Before tax or a discount to do it here. Taking 21% off 121 gives 95.59, which is too little.
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