Percentage calculator
Every everyday percentage question, solved with the working shown.
Result
- 15% of 240
- 36
How this was calculated
Percent of a value
Result = X ÷ 100 × Y
15 ÷ 100 × 240 = 36
Four questions, four formulas
X% of Y: multiply Y by X ÷ 100. 15% of 240 is 36.
X is what percent of Y: divide X by Y and multiply by 100. 18 out of 240 is 7.5%.
Percent change from X to Y: (Y − X) ÷ |X| × 100. From 80 to 100 is a 25% increase; from 100 back to 80 is a 20% decrease.
Y increased or decreased by X%: Y × (1 + X ÷ 100). 240 plus 15% is 276.
Questions people ask
Why is a rise then a fall of the same percent not back to the start?
The second percentage applies to a different base. 100 up 10% is 110; 110 down 10% is 99.
What is the difference between percent and percentage points?
Going from 4% to 5% is a rise of one percentage point, but a 25% increase in the rate itself.
Can I type a calculation into the fields?
Yes. Every number field accepts arithmetic such as 1200*12 and shorthand such as 2.5k.