Percentage Calculator: Find Any Percentage Online
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Percentage Calculator
A percentage is a way of expressing a number as a fraction of 100 — the symbol % literally means "per hundred". This free online percentage calculator handles the four questions people ask most:
- What is X% of Y? — find a percentage of any number.
- X is what percent of Y? — find the percentage between two numbers.
- X is Y% of what? — a reverse percentage: recover the whole from a part.
- Percentage of an amount — the same math with money-style results for prices, tax, and tips.
The percentage formula
The basic percentage formula is:
Percentage = (Part ÷ Whole) × 100
Example: you scored 30 points out of 120. (30 ÷ 120) × 100 = 25%. To go the other way — finding 25% of 120 — divide the percentage by 100 and multiply: (25 ÷ 100) × 120 = 30.
Percentage of an amount of money
Percentages of amounts come up constantly: a 15% VAT on a 200 purchase is (15 ÷ 100) × 200 = 30; a 10% tip on an 85 bill is 8.50. The "% of an amount" mode gives you the answer formatted like money, along with the remaining amount. For price reductions, use the dedicated discount calculator — it also shows the final price and how much you save.
Percentage increase and change
To measure how much a value grew or shrank — a salary raise, a price rise, a weight change — you need the change relative to the starting value, which is a different formula: ((New − Old) ÷ Old) × 100. Use the percentage increase calculator for that.
How to calculate percentage on a phone calculator
On most phone calculators, type the number, press ×, type the percentage, then press the % key and =. For example 150 × 20 % = shows 30. If your calculator has no % key, multiply by the percentage and divide by 100 — or simply use this page; it also accepts Arabic-Indic digits (٠-٩).
FAQs
Divide the percentage by 100, then multiply by the number. For example, 20% of 150 is (20 ÷ 100) × 150 = 30. Or just enter both values in the calculator above and press Calculate.
Divide the first number (the part) by the second number (the whole) and multiply by 100. For example, 30 out of 120 is (30 ÷ 120) × 100 = 25%.
Percentage = (Part ÷ Whole) × 100. A percentage is simply a ratio expressed as a fraction of 100 — the % symbol means "per hundred".
The same way as any number: multiply the amount by the percentage divided by 100. For example, 15% VAT on 200 is (15 ÷ 100) × 200 = 30. Use the "Percentage of an amount" mode above for a money-formatted result.
If you know the part and the percentage it represents, divide the part by the percentage over 100 to find the whole. For example, if 30 is 25% of a number, that number is 30 ÷ 0.25 = 120. Use the "X is Y% of what?" mode.
Yes. The calculator accepts both standard digits (0-9) and Arabic-Indic digits (٠-٩), with either . or ٫ as the decimal separator.