QuickKitPercentage formulas
| Question | Formula |
|---|---|
| X% of Y | X / 100 x Y |
| X is what % of Y | X / Y x 100 |
| % change from A to B | (B - A) / A x 100 |
Common uses
Discounts and sale prices, tips, exam scores, tax, and comparing numbers from one year to the next.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 200 is 0.15 x 200 = 30.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 out of 200 is 30 / 200 x 100 = 15%.
How is percentage change calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result is an increase and a negative result is a decrease.