FreeDev Tools

Percentage Calculator

Calculate X% of Y, what percent X is of Y, and percentage change between two numbers.

Runs locally in your browser. Your input is not uploaded.

How to Use

  1. 1

    Pick the calculation

    Choose percent-of, what-percent, percent change, increase, or decrease.

  2. 2

    Enter number pairs

    Two numbers per line separated by a comma or space, e.g. "15, 200".

  3. 3

    Read the answers

    Each line returns a fully worded result you can copy directly.

Frequently Asked Questions

Choose the "X% of Y" mode and enter the pair on one line, e.g. "15, 200" → 15% of 200 = 30. Multiple lines are calculated together.

Related Tools

Text to HEXEncode text as hexadecimal and decode backTimestamp ConverterConvert Unix epoch timestamps to human dates with timezone supportcURL to CodeConvert cURL commands to JavaScript fetch or Python requestsColor ConverterConvert between HEX, RGB, and HSL color formatsColor Palette GeneratorGenerate complementary and analogous color schemesUnit ConverterConvert length, weight, temperature, area, and volumeBase ConverterConvert between binary, octal, decimal, and hexadecimalRoman NumeralsConvert between Arabic numbers and Roman numerals