Percentage Calculator
Calculate percentages: X% of Y, percentage increase/decrease, percentage difference, and reverse percentage. Free, private, browser-based.
No sign-up • No server uploads • 100% browser-based
What is X% of Y?
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X is what percent of Y?
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Percentage Increase
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Percentage Decrease
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Percentage Difference
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Reverse Percentage
X is Y% of what number?
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Read Guide: How to Calculate Percentages →
How It Works
Select the type of percentage calculation you need, enter the values, and get instant results. All calculations are performed entirely in your browser.
- X% of Y: Multiply Y by X divided by 100. Formula: (X / 100) × Y
- X is what % of Y: Divide X by Y, then multiply by 100. Formula: (X / Y) × 100
- Percentage Increase: ((New - Original) / Original) × 100
- Percentage Decrease: ((Original - New) / Original) × 100
- Percentage Difference: (|X - Y| / ((X + Y) / 2)) × 100
- Reverse Percentage: (X / Y) × 100
Frequently Asked Questions
What is the difference between percentage increase and percentage difference?
Percentage increase measures growth from an original value to a new value. Percentage difference measures the relative difference between two values without designating one as the original.
What is reverse percentage?
Reverse percentage finds the original number when you know a part and its percentage. For example, if 50 is 25% of a number, the answer is 200.
Is this tool free?
Yes, completely free with no limits, no sign-up required, and no data sent to any server.
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