How do I calculate what percentage one number is of another?

This tool calculates "X% of Y". To find what percentage one number is of another, divide the first by the second and multiply by 100 — for example, 30 is 15% of 200 because 30 ÷ 200 × 100 = 15.

Can I use decimal percentages, like 12.5%?

Yes, both fields accept decimal values.

Percentage Calculator

Calculate a percentage of any value instantly.

Percentage (%)

Of value

Result

10% of 200 is 20.

Your file never leaves this browser tab — everything runs locally on your device.

Was this tool helpful?

How to use percentage calculator

Enter the percentage you want to calculate, e.g. 10.
Enter the value it applies to, e.g. 200.
The result updates instantly — no button needed.

Common use cases

Working out a discount, tip or tax amount on a purchase.
Calculating a commission or bonus based on a percentage rate.
Checking a percentage figure from a report or spreadsheet by hand.

Related tools

Calculator

A calculator for everyday arithmetic, with an optional scientific mode for trig, logs and powers.

Compound Interest Calculator

Calculate the maturity amount and interest earned with compounding.

Simple Interest Calculator

Calculate simple interest and the total amount payable.

Profit and Loss Calculator

Find your profit or loss amount and percentage from cost and selling price.