Percentage Calculator
Find a percentage, compare two values, or apply an increase or discount.
Example: 20% of 50 is 10.
Example: what share does 10 represent out of 50? 20%.
Example: going from 50 to 75 is a 50% increase.
Example: a 20% discount on 50 leaves 40; a 20% increase gives 60.
Use a decimal point or comma (for example 12.5 or 12,5), without thousands separators.
About the percentage calculator
Four everyday percentage questions, each with its own field so you do not have to remember which way the formula runs.
The four modes
- What is X% of Y — the share of a total, for example 20% of a 1,450 € invoice.
- X is what percent of Y — a proportion, for example how much of a monthly cloud budget one subscription consumed.
- Percentage change — the difference between two values, positive for an increase and negative for a decrease.
- Add or subtract a percentage — applying VAT, a discount, or a forecast growth rate to a figure.
A common trap
Percentage increases and decreases are not symmetrical. A value that falls by 50% needs to rise by 100% to get back where it started, because each step is measured against a different base. The same applies to cloud spend: a 30% cut followed by a 30% rise leaves you 9% below the original figure, not level with it.