Percent Calculator
Fast, free and easy percentage calculations.
Did you know that nearly 75% of the earth's active volcanoes are located in the Pacific Ring of Fire?
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How to Use This Percentage Calculator
Quick Guide
Our percentage calculator supports four different calculation modes to help you solve any percentage-related problem:
1. X% of Y?
Calculate a percentage of a number. For example: "What is 20% of 500?" The answer is 100.
Formula: (Percentage × Number) ÷ 100
2. X is what % of Y?
Find what percentage one number is of another. For example: "50 is what % of 200?" The answer is 25%.
Formula: (Number1 ÷ Number2) × 100
3. Percentage Change from X to Y
Calculate the percentage increase or decrease between two numbers. For example: "Change from 100 to 120" is a 20% increase.
Formula: ((New Value - Old Value) ÷ Old Value) × 100
4. X +/- Y%
Add or subtract a percentage from a number. For example: "100 + 15%" equals 115.
Formula: Number ± (Number × Percentage ÷ 100)