Percentage Calculator
Three calculators in one: find X% of Y, find what % X is of Y, and find percent change from X to Y. All formulas shown below so you can verify or learn the math.
A simple percentage calculator that solves the three most common percent questions: finding a percentage of a number, finding what percent one number is of another, and calculating percent change between two values. All three run in real time as you type — no submit button, no waiting.
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Last reviewed: April 2026Report an error
What is X% of Y?
30
20% of 150 is 30.
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The Formula
result = (X ÷ 100) × Y
- X = Percentage (%)
- Y = Number
How to Use This Percentage Calculator
- Pick the calculation mode that matches your question.
- Enter your two numbers into the inputs.
- Read the result and plain-English explanation.
- Copy the result or share the pre-filled URL with anyone.
Frequently Asked Questions
- Multiply the number by the percentage, then divide by 100. For example, 20% of 150 = (20 × 150) ÷ 100 = 30. The "What is X% of Y" mode of this calculator does this for you instantly.
- Divide the first number by the second, then multiply by 100. For example, 30 is what percent of 150? (30 ÷ 150) × 100 = 20%. Use the "X is what % of Y" mode above.
- Subtract the original value from the new value, divide by the original, then multiply by 100. A positive result is a percent increase; a negative result is a percent decrease. From 150 to 180 is ((180 − 150) ÷ 150) × 100 = 20% increase.
- A percent is a ratio (part of 100). A percentage point is the arithmetic difference between two percentages. If an interest rate rises from 5% to 7%, that is a 2-percentage-point increase but a 40% relative increase.
- Yes. To find the original value before a percentage change, divide the new value by (1 + rate/100) for an increase or (1 − rate/100) for a decrease. For example, if a price after 20% tax is $120, the pre-tax price is 120 ÷ 1.2 = $100.
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