Percentage Calculator
Calculate percentages in seconds with three modes: 'percentage of a value' (20% of 250), 'what % is a value of another' (50 is 20% of 250), and 'percentage change' between two amounts. The result updates in real time.
Percentage calculation
Result = value × percentage ÷ 100. Example: 20% of 250 = 50.
Result
How to use: Percentages
- 1Pick the operation: % of a value, what % is, or percentage change.
- 2Type the two numbers.
- 3Read the result along with the formula used.
What is it for?
- Work out discounts and sale prices.
- See how much a price or salary went up or down.
- Calculate tips, commissions or grades.
Percentages: the three usual calculations
What is X % of Y
Multiply Y by X/100: 15 % of 80 is 12. To find what percentage A is of B, divide A by B and multiply by 100.
Increases and discounts
A 20 % discount is applied by multiplying by 0.8. A 20 % increase followed by a 20 % discount does not return the original price: 100 → 120 → 96.
Percentage change
(new − old) ÷ old × 100. Going from 50 to 75 is +50 %, but going back from 75 to 50 is −33.3 %.
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Frequently asked questions
How do I calculate X% of a number?+
Divide the percentage by 100 and multiply by the value. Example: 20% of 250 = (20 ÷ 100) × 250 = 50.
How do I calculate what percentage a value is?+
Divide the partial value by the total and multiply by 100. Example: 50 of 250 = (50 ÷ 250) × 100 = 20%.
How is percentage change calculated?+
Use the formula: ((final value − initial value) ÷ initial value) × 100. A positive result means an increase, negative means a decrease.