Calculate percentages, increases, decreases, and compound interest with our comprehensive percentage calculator. Perfect for financial calculations, academic work, and everyday math.
Calculate what percentage of a number is another number.
Calculate what percentage one number is of another number.
Calculate the new value after increasing by a percentage.
Calculate the new value after decreasing by a percentage.
Calculate the percentage change between two values.
Calculate compound interest and final amount.
Our free tool delivers fast, accurate results with no signup, no watermarks, and complete privacy — trusted by thousands of users every day.
What is X% of Y? Calculate instantly.
Calculate percentage increase or decrease between two values.
Find the percentage difference between two numbers.
X is what percent of Y?
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Fully responsive on all platforms.
Choose Calculation Type — Select from: percentage of, percentage change, or percentage difference.
Enter Values — Input your numbers in the provided fields.
Get Result — The answer with the formula used is shown instantly.
Understanding when and why to use this tool helps you get the best results for your specific use case.
| Calculation | Formula |
|---|---|
| X% of Y | Y × (X / 100) |
| X is what % of Y | (X / Y) × 100 |
| % increase from X to Y | ((Y - X) / X) × 100 |
| % decrease from X to Y | ((X - Y) / X) × 100 |
| % difference | (|X - Y| / ((X + Y) / 2)) × 100 |
| Add X% to Y | Y × (1 + X/100) |
20% of 150 = 150 × (20 / 100) = 150 × 0.2 = 30. Our calculator does this instantly for any values.
Percentage increase = ((New Value – Old Value) / Old Value) × 100. For example, from 80 to 100 is a 25% increase.