What is % of ?
is what % of ?
Percentage change from to
is % of what?
About This Calculator
Four common percentage calculations, all on one page:
- X% of Y: e.g. "What is 20% of $150?" → $30
- X is what % of Y: e.g. "30 is what % of 150?" → 20%
- Percentage change: e.g. "From 80 to 100" → +25% increase
- X is Y% of what: e.g. "30 is 20% of what?" → 150
Percentage change formula
(New Value – Old Value) / |Old Value| × 100 = % change
Frequently asked questions
What can this percentage calculator do?
The percentage calculator handles four common problems: finding X% of a number, what percent one number is of another, the percent change between two numbers, and finding the whole from a part and its percentage.
How do I calculate percentage change?
Percent change is (new − old) ÷ |old| × 100. Enter the original and new values and the tool shows the increase or decrease automatically.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. Enter both numbers in the second calculator and the answer updates instantly as you type.