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ΕλληνικάPercentage calculator
Work out percentages in seconds: the percent of a number, the ratio between two numbers, percentage increase or decrease, and prices with VAT or discounts.
18% of 250 = 45
How to use
Choose the calculation you need from the tabs above the calculator, then type your two values. The result updates as you type, so there is no button to press.
- X% of a number: enter the number and the percentage. Example: 18% of 250 is 45.
- What percent?: enter the part and the whole. Example: 45 is 18% of 250.
- Percentage change: enter the old and the new value. Example: going from 200 to 250 is a 25% increase.
- Add / subtract %: enter a price and a rate to see it with tax added or a discount taken off. Example: 250 + 18% = 295 and 250 − 18% = 205.
You can type decimals with either a comma or a point. The copy button puts the full result sentence on your clipboard, ready to paste into a message or spreadsheet.
Frequently asked questions
How do you calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 80 is 80 × 15 ÷ 100 = 12.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. If 30 out of 120 people answered yes, that is 30 ÷ 120 × 100 = 25%.
How is percentage increase or decrease calculated?
Subtract the old value from the new one, divide by the old value and multiply by 100. A price rising from 40 to 50 is (50 − 40) ÷ 40 × 100 = 25% higher. A negative result means a decrease.
Why doesn't a 20% discount followed by a 20% increase bring back the original price?
Because the second percentage is applied to a different base. 100 minus 20% is 80, but 80 plus 20% is only 96. To undo a 20% discount you need to add 25%.
What is the difference between percent and percentage points?
A percent describes a relative change, a percentage point is the plain difference between two percentages. An interest rate moving from 4% to 5% rose by 1 percentage point, which is a 25% increase.
