Free Percentage Calculators

Fast, accurate, and completely free. Choose a calculator below to get started.

Percentage Calculator

Find X% of Y, what percent one number is of another, and solve for the missing whole.

Increase / Decrease

Calculate the percentage change between two values, or apply a percent increase or decrease.

Percent Change

Compare any two numbers to find the percent difference — ideal for prices, scores, and statistics.

Why Use PercentLab?

✓Privacy first: All calculations run locally in your browser. We never collect your data.
✓Instant results: Get answers as you type — no page reloads, no waiting.
✓Free forever: No sign-up, no subscription, no hidden fees.
✓Works offline: Once loaded, all the tools continue to function without an internet connection.