Complete guide: Percentages
Updated:
Percentages are everywhere: store discounts, tips, taxes, interest and statistics. This calculator gathers the five most searched calculations in one place so you don't have to remember formulas.
The '% of a value' mode answers how much 20% of 150 is (30). 'What % is A of B' tells you what percentage 30 is of 150 (20%). 'Percentage change' measures how much something rose or fell: from 100 to 125 is a 25% increase.
For discounts and increases use the direct modes: a 30% discount on 80 brings the price to 56, and a 15% raise on 1,200 takes it to 1,380. Ideal for shopping, sales and salary negotiations.
How it works
- 1Choose the calculation type in the selector.
- 2Enter the two values and read the result instantly.
- 3The breakdown shows the applied formula step by step.
Frequently asked questions
How do I get the percentage of a number?
Multiply the number by the percentage and divide by 100: 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I calculate a discount?
Use the 'decrease by %' mode: final price = price × (1 − discount ÷ 100).
What is percentage change?
It is the difference between two values divided by the initial value, expressed as %: from 100 to 125 is +25%.