Calculators
About the Percentage Calculator
The Percentage Calculator is a free online calculator from Toolbench. Percent of, percent change, increase and decrease. Enter your numbers and the answer — with the formula used — updates as you type.
- Category
- Calculators
- Price
- Free
- Account
- Not required
- Runs
- Entirely in your browser
How to use the Percentage Calculator
- Enter the values (calculate, x, y).
- Read the result — it updates as you type.
- Check the breakdown rows to see exactly how it was calculated.
Worked example
| Calculate | What is X% of Y? |
|---|---|
| X | 15 |
| Y | 200 |
| 15% of 200 | 30 |
| Formula | X ÷ 100 × Y |
Formula: X% of Y = X ÷ 100 × Y. “X is what percent of Y” = X ÷ Y × 100. Percent change from X to Y = (Y − X) ÷ |X| × 100.
Inputs
| Calculate | What is X% of Y? · X is what % of Y? · % change from X to Y · Y increased by X% · Y decreased by X% |
|---|---|
| X | Default: 15 |
| Y | Default: 200 |
Privacy
Everything runs in your browser: what you type or paste is processed by JavaScript on your device, not on a server. If you are signed out, nothing is saved at all. If you sign in with Google, your inputs and settings are saved privately to your account so they sync across devices.
Frequently asked questions
Is the Percentage Calculator free?
Yes. Percentage Calculator is completely free with no sign-up, no usage limits and no watermarks.
Is my data private?
Yes. The Percentage Calculator processes everything in your browser. Signed out, nothing is saved; signed in, your inputs sync privately to your own account.
How does the percentage calculation work?
X% of Y = X ÷ 100 × Y. “X is what percent of Y” = X ÷ Y × 100. Percent change from X to Y = (Y − X) ÷ |X| × 100.
Does it work on my phone?
Yes. Toolbench runs in any modern browser on desktop, tablet or phone — there is nothing to install.
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