What this calculator handles
This calculator covers the percentage tasks people usually reach for first: finding a percent of a number, measuring increase or decrease, comparing two values, reversing a percentage, and applying a discount or markup.
When to use each mode
Use percent of when one number is clearly the base. Use change when there is a before and after value. Use difference when the values are peers. Use reverse when you know a part and need the whole.
Common questions
What is the difference between percentage change and percentage difference?
Percentage change compares a new value with a starting value. Percentage difference compares two values against their average, which is useful when neither value is the clear starting point.
Can this calculate discounts?
Yes. Use the discount mode to subtract a percentage from an original value, or markup mode to add a percentage to it.
What does reverse percentage mean?
Reverse percentage starts with a part value and a percentage, then calculates the whole value that the part came from.