Percentage Calculator

Four everyday percentage questions in one place: a percent of a number, what percent one number is of another, the whole from a part, and increasing or decreasing by a percent.

What Do You Want to Find?
Fractions and decimals both work.
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Answer
Question
As a decimal
Also
Work

Saved Calculations

Items you add are saved in this browser.

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How to Calculate Percentages

"Percent" means per hundred, so 15% is 15/100 = 0.15. Every percentage question is one of three rearrangements of part = percent × whole.

Part = percent ÷ 100 × whole
Percent = part ÷ whole × 100
Whole = part ÷ (percent ÷ 100)
Add P%: number × (1 + P/100)   Subtract P%: number × (1 − P/100)

Worked Example

Tips

Percentages swap: 8% of 50 is the same as 50% of 8, which is often easier in your head. Adding 20% and then subtracting 20% does not get you back to where you started (100 → 120 → 96), because the second percentage is of a bigger number. For change between two numbers, use the percent change calculator.