Percentage Calculator
Three common percentage questions. Type in any row and read the answer beside it.
How to use Percentage Calculator
- Pick the question: percent of a number, part of a whole, or percent change.
- Type the numbers, and the answer updates as you type.
How do I calculate a percentage increase?
Use percent change: (new - old) / old x 100.
What if the starting value is zero?
Percent change is undefined when the starting value is zero, so the tool shows an error.