Tools / Percentage calculator
Percentage calculator
Five everyday percentage questions in one place. Type the numbers – results appear instantly.
What is% of
is what % of
% change fromto
Increaseby%
Decreaseby%
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🔒 Runs entirely in your browser – nothing you enter is uploaded or stored.
How to use it
- Pick the question that matches your problem.
- Enter the two numbers (decimals with a dot or comma both work).
- Read the result on the right – it updates as you type.
Last checked: October 2026. Found a mistake? Use the form below – we fix confirmed errors and update the date.
Frequently asked questions
How do I calculate X% of a number?
Multiply the number by X and divide by 100. Example: 15% of 80 = 80 × 15 ÷ 100 = 12.
How do I calculate percentage change?
(New − Old) ÷ Old × 100. Example: from 80 to 100 = (100 − 80) ÷ 80 × 100 = +25%.
Why is +20% then −20% not the original value?
Because the second percentage applies to the new value. 100 + 20% = 120, and 120 − 20% = 96.
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