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Select from basic percentage, percentage change, or percentage of total calculations.
Percentage Calculator
Choose a calculation mode and enter your values
What is X% of Y?
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Pro Tip
When calculating discounts, always calculate percentage off the original price, not the already-discounted price. For example, a 20% discount followed by another 20% discount is not 40% off—it's actually 36% off the original price.
Common Percentage Calculations
| Example | Result | Type |
|---|---|---|
| 20% of 100 | 20 | Part of a whole |
| 25 is what % of 200 | 12.5% | Percentage calculation |
| Increase 50 by 20% | 60 | Percentage increase |
| Decrease 80 by 25% | 60 | Percentage decrease |
| Change from 40 to 50 | 25% increase | Percentage change |
How to Use the Percentage Calculator
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Enter Your Numbers
Input the values you want to calculate. The calculator handles decimals and large numbers.
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Get Instant Results
View your result immediately with step-by-step calculation breakdown.
Frequently Asked Questions
To find what percentage X is of Y, divide X by Y and multiply by 100. For example: 25 is what % of 200? → (25 ÷ 200) × 100 = 12.5%. Our calculator does this automatically when you enter both numbers.
Percentage increase shows how much a value has grown: ((New - Old) / Old) × 100. Percentage decrease shows how much it has dropped: ((Old - New) / Old) × 100. For example, going from 100 to 120 is a 20% increase, while 120 to 100 is a 16.67% decrease.
To calculate a percentage of a percentage, convert both to decimals and multiply. For example, 20% of 50% = 0.20 × 0.50 = 0.10 = 10%. This is useful for calculating compound discounts or multi-stage calculations.
Understanding Percentage Calculations
Percentages are fundamental to mathematics, finance, statistics, and everyday life. Whether you're calculating discounts while shopping, analyzing business growth, or understanding test scores, percentage calculations help you compare values and understand proportional relationships.
Our percentage calculator handles all common percentage operations including finding what percentage one number is of another, calculating percentage increase or decrease, and determining percentage points. The tool provides instant, accurate results with clear explanations of the calculation method.