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Percentage Calculator
Work out percentages, percentage change, increases and decreases without doing the math by hand.
%of
25% of 400100
Common calculations
10% of 5010% of 10010% of 20010% of 50010% of 100015% of 5015% of 10015% of 20015% of 50015% of 100020% of 5020% of 10020% of 20020% of 50020% of 100025% of 5025% of 10025% of 20025% of 50025% of 100030% of 5030% of 10030% of 20030% of 50030% of 100040% of 5040% of 10040% of 20040% of 50040% of 100050% of 5050% of 10050% of 20050% of 50050% of 1000
What this does
This calculator answers the three questions people ask most about percentages: what is X% of a number, what percentage one number is of another, and how much a value changed in percent from one figure to the next.
How to use it
- 1Pick the question that matches what you need — 'percent of', 'X is what percent of Y', or 'percentage change'.
- 2Type your two numbers into the fields.
- 3The result updates instantly as you type — no button required.
Examples
- 25% of 400 = 100
- 45 is 30% of 150
- From 80 to 100 is a 25% increase
Frequently asked questions
- How do I calculate what percentage one number is of another?
- Divide the part by the whole and multiply by 100. For example, 45 out of 150 is (45 ÷ 150) × 100 = 30%. The 'X is what percent of Y' mode does this for you.
- What is the difference between percentage change and percentage points?
- Percentage change is relative: going from 10% to 15% is a 50% increase. Percentage points are absolute: that same move is a 5 percentage-point increase. This tool reports relative percentage change.
- Does the calculator round the result?
- Results are shown to a sensible number of decimals and trailing zeros are trimmed. The underlying calculation uses full precision.