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Students often need to calculate the percentage change in the initial or start and final values of numbers for e.g. microbial populations, acid degree values in foods, body weight. In this situation the order of the numbers used in the calculation is important and the change can be negative or positive.

The calculator below will quantify the change from one number to another and express the change as a % increase or % decrease. 


Calculate the % change between two numbers

To use add your values to the fields below.

Initial value
Final value




How to cite this article

Mullan, W.M.A. (2022) [On-line] Available from: Accessed: