Percentage Calculator
Find a percentage of a number quickly and clearly.
How to use the Percentage Calculator
- Enter the percentage (for example 15).
- Enter the number you want the percentage of.
- The answer appears instantly.
Result = (Percentage ÷ 100) × Value
About the Percentage Calculator
This calculator answers the everyday question “what is X% of Y?” by computing X ÷ 100 × Y, and alongside it shows Y plus that amount and Y minus that amount — the three operations behind almost every discount, tip, tax and markup you will ever meet.
Those two extra rows hide something worth knowing. Adding a percentage and then subtracting the same percentage does not bring you back where you started. Add 15% to 200 and you get 230; take 15% off 230 and you get 195.50, not 200. The two percentages are taken from different bases — the first from 200, the second from the larger 230 — so the fall is worth more than the rise. This is why a 50% crash after a 50% gain leaves you down 25%, and why “50% off” followed by “20% off” is a 60% discount rather than 70%.
The same asymmetry explains why removing a tax is not the same as subtracting its rate: to strip 20% VAT from a gross price you divide by 1.2, not multiply by 0.8. If you want the change between two known values instead of a percentage of one, use the percentage change calculator; for shop prices, the discount calculator is more direct.
Frequently asked questions
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. 30 out of 200 is (30 ÷ 200) × 100 = 15%.
Why doesn’t adding then subtracting 15% get me back to the start?
Because the second percentage is taken from a bigger number. 200 + 15% = 230, but 15% of 230 is 34.50, so you land on 195.50. Percentages are always relative to whatever base they are applied to.
How do I remove a percentage that is already included in a price?
Divide rather than subtract. A price that includes 20% tax is 1.2 times the net price, so divide by 1.2. Subtracting 20% would take too much off.
Do two discounts add up?
No. 50% off then 20% off means paying 0.5 × 0.8 = 0.4 of the original — a 60% discount, not 70%. Stacked percentages multiply.
Can I enter a percentage over 100?
Yes. 150% of 200 is 300. Percentages above 100 simply mean more than the whole.
Guides & articles about this tool
How to Calculate Percentages Fast (No Calculator Needed)
Everyone needs to know how to calculate percentages. Whether you’re splitting a restaurant bill or working out a discount in the sales, it’s a skill that…