Tool
Percentage Calculator
Three modes: find a percentage of a number, work out what percentage one value is of another, or calculate percentage change. Pick a mode, type your numbers.
About this calculator
This percentage calculator covers the three questions people actually search for. The first mode answers "what is X% of Y?" — useful for working out tips, discounts, tax amounts, or commission. Type 20 and 150, get 30.
The second mode answers "X is what percentage of Y?" — for when you got 43 out of 60 on a test and want to know the score, or you want to know what fraction of a budget has been spent. Divide and multiply by 100, displayed instantly.
The third mode calculates percentage change between two values. Enter the starting value and the ending value, and it tells you whether that's an increase or decrease and by how much. The formula — (new − old) ÷ |old| × 100 — is shown below the result so you can verify the math.
All three modes show the formula used, not just the answer. If you need to explain the result to someone else (or a teacher), the working is right there.
Everything runs in your browser. No data is sent anywhere.
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