Percentage Calculator
Free percentage calculator. Find what percent one number is of another, calculate X% of Y, and compute percentage increase or decrease — with formulas shown.
30
15% of 200 is 30
Formula
15% × 200 = (15 ÷ 100) × 200
How to use Percentage Calculator
- 1
Pick one of the three modes (percent of, what percent, percent change).
- 2
Enter the two numbers involved.
- 3
The result — and the formula behind it — appears instantly.
- 4
Copy the result into your document or spreadsheet.
Key features
X% of Y calculator
X is what percent of Y
Percentage increase / decrease
Formulas shown for every result
Instant results while typing
Copy any result
Percentage Calculator — FAQ
Divide the increase by the original value and multiply by 100. For example, 50 → 75 is an increase of 25, which is 50% of 50.
It multiplies Y by X/100. For example, 15% of 200 = 200 × 0.15 = 30.
Showing the working makes the calculation transparent and helps you learn to do it yourself — no black boxes.
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