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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.
How to cite this article
Mullan, W.M.A. (2022) [On-line] Available from: Accessed: