Percentage Calculator
Three percentage calculations in one place: a percentage of a number, what share one number is of another, and the change between two values. Each one shows the formula it used.
Percentage Calculator
15% of 60
9
Show the working
| As a decimal | 15 ÷ 100 | 0.15 |
|---|---|---|
| Multiplied by the value | 0.15 × 60 | 9 |
How to use it
- Pick the calculation you need from the three tabs at the top.
- Type your numbers into the two boxes. The answer updates as you type — there is no button to press.
- Read the working under the result if you need to show it or check it.
- Note that a change from 4% to 6% is both 2 percentage points and a 50% increase. Both are correct; pick the one you mean.
- Percentage changes do not cancel out: down 20% then up 20% leaves you at 96, not 100.
Frequently asked questions
- How do I calculate a percentage of a number by hand?
- Divide the percentage by 100, then multiply. 15% of 60 is 0.15 × 60 = 9. As a mental check, 10% is the number with the decimal point moved one place left.
- What is the percentage increase formula?
- Subtract the old value from the new one, divide by the old value, then multiply by 100. From 80 to 100 is (100 − 80) ÷ 80 × 100 = a 25% increase. The old value is always the denominator.
- Does this send my numbers anywhere?
- No. The page is a static file and the arithmetic runs in your own browser. You can confirm it by turning off your connection and using it offline.
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Built and maintained by Kavitha Kanchana
Software engineer at Cortana AI and co-founder of Ryzera Technologies, based in Sri Lanka. Found a bug or a wrong number? Email me.