About this tool
Three handy percentage calculators in one — find a percentage of a number, express one number as a percentage of another, and measure the percent change between two values. Everything is computed live in your browser.
Frequently asked questions
How is percent change calculated?
It is (new − old) divided by the absolute value of the old number, times 100. A positive result is an increase and a negative one is a decrease.
Does it round the results?
Results are rounded to at most six decimal places for readability, and the whole calculation runs locally in your browser.