What if the original is zero?

Percentage change is undefined when the starting value is zero.

Increase then decrease by same %?

You don't return to the start — the base differs each time.

Home › Business & Money Math › Percentage Change Calculator

Free percentage change calculator. Find the percent increase or decrease between two numbers.

Measure growth or decline as a percentage change from an original value to a new value.

Percentage change = (new − old) ÷ |old| × 100, with the absolute difference also shown.

Going from 150 to 200 is a 33.3% increase, a difference of 50.

Negative result?: A negative percentage means a decrease from the original value.
Percentage points?: Going from 10% to 15% is a 5 percentage-point rise but a 50% relative increase.
What if the original is zero?: Percentage change is undefined when the starting value is zero.
Increase then decrease by same %?: You don't return to the start — the base differs each time.