There are two main percentage change calculators below.

  1. For working out the percentage which is unknown
  2. For when the percentage is known and needs to be applied to an initial amount.

1. Percentage Unknown

Use this calculator if you need to work out the percentage an amount has changed by.

E.g. 200 has changed to 100, what is the percentage change?

From to =
% change


2. Percentage Known

Use this calculator if you need to work out an amount after you change it by a certain percentage.

E.g. 100 changes by 15%, what is the final amount?

by % =