Percentage calculator
Answer any everyday percentage question, with the working shown.
What is X% of Y?
Result
Enter both numbers to see the result.
Report a problem with this tool
How to use Percentage calculator
Pick your question
What is X% of Y, X is what percent of Y, the change from X to Y, or Y increased or decreased by X%.
Type two numbers
Use your usual decimal comma or point. The answer updates as you type.
Read and copy the answer
See the result, a sentence that explains it and the sum behind it. Copy the result with one click.
Why use Utils365
Four calculators in one
The four percentage questions people ask most often, without hunting for the right formula.
Shows the working
Every answer comes with the formula in plain words, so you can check it or do it yourself next time.
Says increase or decrease
Percentage change tells you which way the number moved, not just a figure with a minus sign.
Your number style
Type 1,234.5 or 1.234,5, whichever you’re used to. Nothing you type leaves your browser.
Frequently asked questions
How do I work out a percentage of a number?
Divide the percentage by 100, then multiply by the number. 20% of 80 is 20 ÷ 100 × 80 = 16.
How do I find what percentage one number is of another?
Divide the part by the whole, then multiply by 100. 16 out of 80 is 16 ÷ 80 × 100 = 20%.
How do I calculate percentage change?
Take the new number minus the old one, divide by the old number, then multiply by 100. Going from 80 to 100 is (100 − 80) ÷ 80 × 100 = a 25% increase. A negative result is a decrease.
How do I add or take off a percentage?
Work out the percentage of the number, then add it or take it away. 80 plus 20% is 80 + 16 = 96. 80 minus 20% is 80 − 16 = 64. As a shortcut, multiply by 1.2 or 0.8.
Why doesn’t a 20% rise undo a 20% fall?
Each percentage is taken from a different starting number. 100 down 20% is 80, but 80 up 20% is only 96. To get back to 100 from 80 you need a 25% rise.
Why can’t I find the percentage change from 0?
Percentage change divides by the starting number, and you can’t divide by 0. Any rise from nothing would be infinitely large, so the calculator asks for a different start.