MicroCalculatorsPercentage Calculator
Three percentage calculations in one tool. Find X% of a number, calculate what percentage one number is of another, or find a percentage increase or decrease.
What is X% of Y?
X is what % of Y?
Percentage change from X to Y
How to Calculate Percentages
Percentages express a part as a fraction of 100. The three most common calculations are: finding a percentage of a number (e.g., 15% of 200 = 30, calculated as 200 × 15 ÷ 100), finding what percentage one number is of another (e.g., 30 is 15% of 200, calculated as 30 ÷ 200 × 100), and finding percentage change between two values (e.g., going from 50 to 75 is a 50% increase, calculated as (75 − 50) ÷ 50 × 100). Each of these three sections above handles one of those scenarios instantly as you type.
Percentage calculations come up constantly in everyday life: calculating tips and discounts, tracking price changes, interpreting statistics, understanding test scores, and more. A percentage decrease works the same as an increase — if the result is negative, the value went down. For example, going from 100 to 80 gives (80 − 100) ÷ 100 × 100 = −20%, meaning a 20% decrease. Use the third section above any time you need to compare two values and express the change as a percentage.
Percentage Calculator — FAQ
- How do I find X% of a number?
- Multiply the number by X and divide by 100. For example, 15% of 200 = 200 × 15 / 100 = 30. Use the first section of this calculator to get the answer instantly.
- How do I calculate percentage increase?
- Subtract the original value from the new value, divide by the original value, then multiply by 100. For example, going from 50 to 75 is a 50% increase: (75 − 50) / 50 × 100 = 50%.
- What is the percentage formula?
- There are three common formulas: (1) Part = Percentage × Whole / 100, (2) Percentage = Part / Whole × 100, (3) Percentage change = (New − Old) / Old × 100.
- How do I calculate a discount?
- Use the "What is X% of Y?" section. Enter the discount percentage as X and the original price as Y. The result is the discount amount. Subtract that from the original price to get the sale price.
Last updated: March 2026