Percentage Tools

Guides

Percentage change vs percentage points

A change in a rate can be described in two different ways.

How discount calculations work

A discount removes a fraction of the original price.

Markup is not profit margin

Markup uses cost as the base, while margin uses selling price.

Reverse a percentage calculation

Reverse percentages divide by the rate instead of multiplying by it.

Round percentage results deliberately

Rounding too early can change later calculations.