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Calculate percentages in all directions — what is X% of Y, what percentage is X of Y, and percentage increase or decrease between two numbers.
Percentage calculator · X% of Y · what percent is X of Y · percent change · add subtract percentage
Select from: “What is X% of Y?”, “X is what percent of Y?”, “Percentage change from X to Y”, or “X increased/decreased by Y%.”
Fill in the known numbers. The result calculates instantly.
The answer is displayed with a plain-language explanation of what was calculated, so it’s easy to verify.
Divide the part by the whole, then multiply by 100. Example: 45 is what percent of 180? → 45 ÷ 180 = 0.25 → × 100 = 25%. The “X is what percent of Y” mode does this automatically.
Subtract the original value from the new value, divide by the original value, and multiply by 100. Example: price went from £80 to £92 → (92 − 80) ÷ 80 × 100 = 15% increase. Use the “Percentage change” mode for this.
A percentage point is an absolute difference between two percentages. If an interest rate goes from 3% to 5%, it increased by 2 percentage points — but it increased by 66.7% in relative terms (2 ÷ 3 × 100). These are different things and easy to confuse in financial and news contexts.
Yes. All calculations run in your browser with no server communication.
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Percentages are used across every area of daily and professional life — pricing, finance, grades, statistics, discounts, tax, tips, and growth rates. Doing them correctly in your head is error-prone, especially for percentage change calculations where direction (increase vs. decrease) and the choice of base value can easily produce the wrong answer. This calculator covers the four most common percentage question types, each with an instant result and a plain-language explanation of the calculation so the logic is transparent rather than just showing a number.
All calculations run in your browser. No data is transmitted to any server.
