Percentage calculator

The three percentage problems everyone needs: what is X% of Y, X is what percent of Y, and the percentage change from one value to another — all in one click.

How to Percentage calculator

1. Step 1. Enter your two values and the operation you need (of / is-what-% / change).
2. Step 2. The result updates live as you type.
3. Step 3. Copy the result or the underlying formula.

Frequently asked questions

How do I calculate 20% of 150?

Multiply 150 × 0.20 = 30. The tool’s “X% of Y” mode does exactly this instantly.

How do I calculate percentage increase?

Divide the new value by the old value, subtract 1, and multiply by 100. The change mode handles it live.

Is the percentage calculator free?

Yes, 100% free in your browser with zero latency and no signup required.