Percentage Calculator

The three most common percentage questions — one tool, three tabs, instant answers.

What is% of?

Result

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Every tool runs 100% in your browser — your inputs never leave your device.

How to use

How to use — Percentage Calculator

01 Pick one of the three modes.
02 Enter the numbers.
03 Results update automatically.

About this tool

Percentages appear in nearly every business context — discounts, margins, growth, bonuses. This tool breaks the three most common cases into three tabs so you never have to look up a formula: percent of a number, ratio between two numbers, and change (increase / decrease).

FAQ

How do I compute a discount percentage?

Use the third mode: old price → new price. A negative result means a discount.

Does it support decimals?

Yes. Use a period as the decimal separator (e.g. 12.5).

Often used together