Free Online Percentage Calculator
Each mode shows the arithmetic, so you can check the answer or explain the method to someone else.
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How to use Percentage Calculator
- Choose the question type.
- Fill the two numbers.
- Read the answer and the worked steps.
Questions about Percentage Calculator
From 40 to 52 — what is the percentage increase?
30 percent: divide the difference by the original number, so 12 / 40 = 0.3.
Why is a 20 percent rise then 20 percent fall not neutral?
The second change uses the new, larger base. 100 becomes 120, then 96.
About Percentage Calculator
Find percentages, increases and shares with our free online Percentage Calculator. 100% browser-based, fast, and private—no login or file uploads required.
These calculators and converters turn everyday numbers into answers instantly: percentages, BMI, loans and interest, units, colours and dates, with the formula shown so you can check the working.
This tool runs in your browser. The file is not uploaded. Results update as you type and are rounded for display; for money or legal figures keep the unrounded value and double-check against your own spreadsheet before relying on it.