Percentage Calculators
Five free percentage calculators for every everyday math situation — discounts, grade changes, price increases, and more.
- Instant results as you type
- No data stored or shared
- Free, no signup required
- Mobile & desktop friendly
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Percent Change Calculator
Calculate the percentage increase or decrease between two values. See if a change is positive or negative and by how much. Free, instant.
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Percent Difference Calculator
Calculate the percentage difference between two values. Non-directional — ideal for comparing two measurements. Free, instant.
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Percent Increase Calculator
Calculate a new value after a percentage increase. Raise prices, estimate salary bumps, project investment growth. Free, instant.
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Percent Off Calculator
Calculate the final price after a percentage discount. Find out how much you save and what you'll pay. Free, instant, no signup.
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Percentage Of Calculator
Calculate what X% of any number is. Instant results for tips, discounts, tax, grades, and more. Free, no signup required.
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About PercentCalc
PercentCalc offers five free percentage calculators covering the most common math situations: finding a percent of a number, measuring how much something changed, calculating sale prices and discounts, projecting increases, and comparing two values side by side.
All calculations run locally in your browser. No data is collected or transmitted.
Which calculator should I use?
- Tip, tax, commission? Use Percent Of — "15% of $50."
- Did a price go up or down? Use Percent Change — "from $80 to $100."
- How much do I save on a sale? Use Percent Off — "20% off $120."
- New value after a raise or increase? Use Percent Increase — "salary up 5%."
- Comparing two values with no clear 'before'? Use Percent Difference.
Latest Articles
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How to Work Out Percentages Without a Calculator
Master mental math strategies for working out percentages without a calculator — from the 10% building-block method to fraction shortcuts and estimation tricks.
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How to Calculate Percentage: Formula, Examples, and Shortcuts
Learn how to calculate percentage with the core formula, step-by-step examples, and mental-math shortcuts you can use anywhere.
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Percentage Difference vs. Percentage Change: What's the Difference?
Percentage difference and percentage change are not the same thing. Learn when to use each formula, see worked examples, and avoid the most common mistake.
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How to Calculate a Discount Percentage (and the Final Price)
Learn how to calculate discount percentages and final sale prices with step-by-step formulas, worked examples, and a quick reference for common discounts.
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Percentage Change Formula: How to Calculate Increase and Decrease
Master the percentage change formula for both increases and decreases. Includes step-by-step examples, a quick reference table, and common pitfalls.
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What Percentage Is X of Y? The Simple Formula Explained
Learn the one formula that answers 'what percentage is X of Y?' — with worked examples, a reference table, and tips for getting it right every time.