Percentage Calculator

Calculate percentages instantly. Find what percent one number is of another, percentage increase/decrease, and more.. Free, no signup, works in your browser.

Percentage (%)

Number

All calculations happen in your browser. No data is sent to any server.

About Percentage Calculator

This percentage calculator handles all common percentage operations in one tool. Calculate what percent a number is of another, find a percentage of a number, and compute percentage increase or decrease between two values. Features four calculation modes: (1) What is X% of Y? (2) X is what percent of Y? (3) Percentage change from X to Y (4) Increase/decrease X by Y%. All calculations happen instantly in your browser with no data sent to any server. Perfect for students, shoppers calculating discounts, investors tracking gains, and anyone working with percentages.

Frequently Asked Questions

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

Use the 'X is what % of Y?' mode. Enter the part (X) and the whole (Y). The calculator divides X by Y and multiplies by 100. For example, 25 is 50% of 50.

How do I calculate percentage increase or decrease?

Use the 'Percentage change' mode. Enter the old value and new value. The calculator uses the formula: ((new - old) / old) × 100. A positive result means increase, negative means decrease.

Can I calculate a percentage of a number?

Yes. Use the 'What is X% of Y?' mode. Enter the percentage and the number. For example, 15% of 200 = 30.

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