UK Tools

Everyday Utilities

Percentage Calculator

Percentages appear everywhere — discounts, tax, tips, exam scores and growth rates. This free percentage calculator covers the most common everyday calculations in one place.

Work out X% of a number, what percent one number is of another, percentage change between two values, and reverse percentages. Ideal for shopping, budgeting and quick checks at work.

All maths runs in your browser with no tracking of the numbers you enter.

Interactive tool

Results

Result12.00

15.00% of 80.00

How to use this tool

  1. Pick the calculation type you need.
  2. Enter the numbers in the labelled fields.
  3. Read the result instantly as you type.
  4. Use related tools for money or unit conversions if needed.

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 × 0.15 = 12.
How do I calculate percentage increase?
((new − old) ÷ old) × 100. A rise from 50 to 65 is a 30% increase.
What is a reverse percentage?
Finding the original amount before a percentage change. If a price after 20% off is £80, the original is 80 ÷ 0.8 = £100.
Can I use this for VAT?
Yes for simple VAT-style add/remove percentage. UK VAT rates and special schemes are not modelled beyond a plain percentage.

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