# Percentage change of a number

The calculation of the change in one number relative to another can be represented as a percentage. This calculator is designed to quickly and correctly calculate the percentage increase or decrease. It is also suitable for counting the percentage increase in prices for any product.

.## Calculation formula

% increase = 100 x (B — A) / A

% decrease = 100 x (A — B) / A

In this formula: A is the old number, B is the new one.