Percentage Calculator

Find percentages, percentage change and percentage difference with the formula shown.

Loading tool...

How to use the Percentage Calculator

Open the Percentage Calculator.
Enter your input in the fields provided - results update as you type where practical.
Use Copy or Download to take the result with you, or Reset to start again.

About this Percentage Calculator

This percentage calculator handles the three questions people ask most: what is X% of Y, X is what percent of Y, and what is the percentage change or difference between two numbers. Every result shows the formula used, so you can check homework, discounts, tax, tips and price increases instead of trusting a black box.

How it works

Percentage = (part / whole) x 100. Percentage change = ((new - old) / |old|) x 100. Percentage difference uses the average of the two values as the denominator.

Privacy note: this tool runs locally in your browser. Your input is not uploaded, stored in analytics, or placed in the page URL.

Frequently asked questions

Is the Percentage Calculator free?

Yes. It is completely free, needs no account, and runs in your browser.

Is my data uploaded when I use the Percentage Calculator?

No. Processing happens locally on your device. We do not upload your inputs, files or generated passwords.

How does the Percentage Calculator work?

Percentage = (part / whole) x 100. Percentage change = ((new - old) / |old|) x 100. Percentage difference uses the average of the two values as the denominator.

Related tools

Calculators