Percentage Calculator: Find a Percent of a Number
Use this free calculator to find a percentage of a value, such as 20% of 150, or work out what percentage one number is of another. The examples below explain the formulas step by step.
Calculate a Percentage
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Percentage Calculation Examples
To find 20% of 500, calculate 500 × 20 ÷ 100 = 100. For another example, 28% of 170 is 170 × 28 ÷ 100 = 47.6. To find what percentage 25 is of 200, calculate 25 ÷ 200 × 100 = 12.5%.
Choose the right calculation
- “X% of Y” finds a portion of a value.
- “X is what percent of Y?” compares a part with a whole.
- For increases or decreases between two values, use a percentage-change calculation.
Related tools: Percentage Change and Discount Calculator.
Percentage Calculator FAQs
How do I find a percentage of a number?
Multiply the number by the percentage and divide by 100.
How do I calculate what percent one number is of another?
Divide the part by the whole and multiply by 100; the whole must not be zero.
Where are percentages useful?
They are commonly used for marks, discounts, tax, comparisons, and financial estimates.
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