How do I calculate a percentage of a number?
To find a percentage of a number, multiply the number by the percentage fraction. For example, to find 15% of 200: (15 / 100) × 200 = 30.
Math Utility
Percentage Calculator
Instantly calculate percentages, find out what percent one number is of another, and determine percentage increases or decreases without remembering the formulas.
1. Find a Percentage of a Number
What is% of
?
Result
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2. Find the Percentage
is what % of
?
Result
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3. Percentage Change (Increase / Decrease)
From
to
Result
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Percentage Formulas Explained
If you ever need to calculate these values manually or in an Excel spreadsheet, here are the core mathematical formulas our calculator uses behind the scenes.
Common Formulas
- Percentage of a value: To find a percentage (P) of a number (V), the formula is:
(P / 100) * V. - Finding the percentage: If you want to know what percentage number A is of number B, use:
(A / B) * 100. - Percentage Change: To find the growth or decline between an Old Value and a New Value:
((New Value - Old Value) / Old Value) * 100.
Frequently asked questions
How do I find out what percentage one number is of another?
Divide the first number by the second number, then multiply by 100. For example, to find out what percent 30 is of 150: (30 / 150) × 100 = 20%.
How do I calculate percentage change (increase or decrease)?
Subtract the old number from the new number to find the difference. Then divide the difference by the old number and multiply by 100. If the result is positive, it's an increase; if negative, it's a decrease.
Why use an online percentage calculator?
Percentage math can be tricky to do in your head or remember the exact formulas for. An online calculator guarantees instant, error-free results for taxes, discounts, growth rates, and math problems.
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