Percentage Calculator
Calculate percentages: X% of Y, percentage increase/decrease, and more.
How to Use the Percentage Calculator
This tool provides three common percentage calculations:
- What is X% of Y — enter a percentage and a value to get the result
- Increase/Decrease by % — see a value after increasing or decreasing by a percentage
- Percentage change — calculate the percentage difference between two numbers
Results update as you type. All calculations happen instantly in your browser.
Frequently Asked Questions
How do I calculate a percentage?
To find X% of Y, multiply Y by X/100. For example, 15% of 200 = 200 × 0.15 = 30.
How do I calculate percentage increase?
Percentage increase = ((New Value - Old Value) / Old Value) × 100. Enter both values in the "% change" section.
What is a percentage decrease?
To decrease a value by X%, multiply it by (1 - X/100). For example, 200 decreased by 15% = 200 × 0.85 = 170.
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