UK Answers · ukanswers.co.ukhttps://ukanswers.co.uk/calculators/percentage-calculator/
Percentage Calculator: Find a Percentage, Increase or Decrease
Pick what you want to work out, then type in the two numbers.
15% of 200 is30
200 × 15 ÷ 100 = 30. Adding it gives 230, and taking it away gives 170.
Percentage formulas
| Question | Formula | Example |
|---|---|---|
| What is A% of B? | B × A ÷ 100 | 15% of 200 = 30 |
| A is what % of B? | A ÷ B × 100 | 30 is 15% of 200 |
| % change from A to B | (B − A) ÷ A × 100 | from 200 to 230 is +15% |
Everyday uses
- Pay rises: a 3% rise on £30,000 is £900. Try the pay rise calculator for the take-home effect.
- Sale prices: 20% off £80 is £16 off, so you pay £64.
- Tips and VAT: see the VAT calculator.
A percentage change of more than 100% is possible: doubling a number is a 100% increase, and tripling it is a 200% increase.
Frequently asked questions
How do I work out 10% of a number?
Divide it by 10. For example 10% of 350 is 35.
How do I work out a percentage increase?
Subtract the old number from the new number, divide by the old number and multiply by 100.
How do I take a percentage off a price?
Multiply the price by the percentage divided by 100 and subtract the result. Or multiply by (100 minus the percentage) divided by 100: for 20% off, multiply by 0.8.
More from UK Answers
Figures are for the 2026/27 tax year from official sources and are estimates for guidance only, not financial or legal advice. Printed from ukanswers.co.uk.