Percentage Calculator
Our percentage calculator handles all common percentage calculations: finding what percent of a number is, calculating percentage change, and more.
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Calculator
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Formula
Percentage = (Value ÷ Total) × 100
Divide the part (value) by the whole (total), then multiply by 100 to express the result as a percentage. To find what a percentage represents (reverse), multiply the total by the percentage divided by 100.
How to use the Percentage Calculator
- 1
Enter your value
- 2
Enter your total / whole
- 3
Read your results instantly
Results update in real time as you type.
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Three types of percentage problems
Most percentage questions fall into one of three types: (1) What percent of X is Y? — divide Y by X and multiply by 100. (2) What is P percent of X? — multiply X by P/100. (3) X is P percent of what? — divide X by P/100.
This calculator solves type 1. Bookmark the others as mental math shortcuts — they come up constantly in everyday life.
Tips & Insights
Quick mental math trick
To find 15% of a number: find 10% (move decimal left one), then add half of that for 5%, and add them together. 15% of $84 = $8.40 + $4.20 = $12.60.
Percent change is directional
A 50% increase followed by a 50% decrease does not return you to the starting point — it leaves you at 75% of the original value. Percentages are relative, not absolute.
Worked Examples
Test score
43 out of 50 = 86%. The remainder (wrong answers) is 7.
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Frequently Asked Questions
How do I calculate a percentage?
To find what percentage a value is of a total, divide the value by the total and multiply by 100.
What is a percentage point vs. a percent change?
A percentage point is an absolute difference (from 10% to 15% is 5 percentage points). A percent change is relative (from 10% to 15% is a 50% increase).
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