How to calculate a percentage of any number
"What is X percent of this number?" comes up every day: working out a shop discount, a restaurant tip, a sales commission, an annual pay rise or a student's mark out of a total. This calculator is built for exactly that question. Enter the percentage and the number, and it returns that percentage of the number.
The calculation runs in your browser using a simple formula: result = percentage ÷ 100 × number, rounded to two decimal places.
How to use it
- Type the percentage in "Percentage %", for example 15.
- Type the base number in "Of number", for example 200.
- Press "Calculate".
- The result appears; in this example, 30.00.
What you can control
- The percentage can be a whole number or a decimal such as 2.5 or 0.75.
- It can exceed 100, so 150% of a number gives one and a half times its value.
- The base number accepts large amounts and fractions.
- Results are always shown with two decimal places.
Handy tricks with the same tool
- Price after an increase: to add 10%, enter 110 instead of 10 and you get the increased figure directly. For example, 110% of 2,000 = 2,200.
- Price after a discount: for 25% off, enter 75. For example, 75% of 360 = 270.
- Tips and commissions: enter the rate and the bill to see the amount added.
Practical examples
- An employee getting a 4% rise on a salary of 12,500 sees the rise is 500.
- A student who scored 85% on a test marked out of 40 learns their mark is 34.
- An affiliate earning 7.5% on 8,000 of sales sees a commission of 600.
- A shop owner checks how much 30% off a 149 item takes off the price.
Important notes
- This calculator works out "X% of Y" only. It has no separate mode for percentage change between two numbers or for what percentage one number is of another.
- To find what percentage one number is of another, calculate (part ÷ whole) × 100; for example, 45 out of 60 is 75%.
- For percentage change: ((new − old) ÷ old) × 100. A price rising from 80 to 100 is a 25% increase.
- An increase followed by a decrease of the same percentage does not return you to the start: 100 plus 10% is 110, and 10% off 110 is 99.
For related calculations, try the discount calculator, which shows the sale price and your saving together, the VAT calculator, and the ratio calculator.