Calculators
Percentage Calculator
Work out percentages, increases, decreases and percentage differences.
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About this percentage calculator
Percentages trip people up because the same word covers four different sums. This calculator splits them out so you pick the question rather than the formula.
Everything updates as you type and nothing is sent anywhere — the maths runs in your browser.
How to use it
- Choose the type of percentage question you have.
- Fill in the two numbers you know.
- The answer appears immediately, with the working shown underneath.
Percentage Calculator — FAQ
How do I calculate a percentage increase?
Subtract the old value from the new one, divide by the old value, then multiply by 100. The Increase/Decrease tab does this for you.
What is 15% of 80?
12. Use the 'What is X% of Y' tab and enter 15 and 80.
Is the calculation done on a server?
No, it runs entirely in your browser. Nothing you type leaves your device.
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