Percentage calculator
Discounts, pay rises, % change
Worked out in your browser. No sign-up.
Pick what you need: a percentage of a number, what percentage one number is of another, the percentage change between two values, or an amount after a rise or discount. For a percentage of a number, multiply the number by the percentage and divide by 100. So 15% of 2,400 is exactly 360.
How it works
- X% of Y: Y × X / 100
- X as a % of Y: X / Y × 100
- Change: (new − old) / old × 100
- Amount after a change: Y × (1 + X / 100), with X negative for a discount.
A 20% rise followed by a 20% cut doesn't take you back to where you started. From 1,000, +20% gives 1,200, and −20% of that leaves 960.
Worked example
Discount: a jacket costs €80 with 25% off. In “Number ± X%” enter −25 and 80. You pay €60.
Pay rise: your salary went from €2,000 to €2,150 a month. “% change” gives +7.5%.
Share: 12 out of 30 pupils passed the test, which is 40%.
Questions people ask
How do I work out a percentage on a calculator?
On most calculators type 350 × 7 % and you get 24.5. With no % key, type 350 × 7 ÷ 100.
How do I work out a percentage decrease?
Take the new price from the old one, divide the difference by the old price and multiply by 100. From 2,500 down to 2,000: 500 / 2,500 × 100 = 20% less.
How do I calculate a percentage in Excel?
With the part in A2 and the whole in B2, type =A2/B2 and format the cell as a percentage. The change from A2 to B2 is =(B2-A2)/A2.
What is a percentage point?
When an interest rate goes from 4% to 5%, it has risen by 1 percentage point, but by 25% compared with the old rate.
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Updated: 13 November 2026