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. This calculator enables this change to be calculated.

The percentage difference calculator finds the absolute value (regardless of sign) of the change in value for any two numbers that belong to the same category. The calculator can be accessed from this link.