# Percentage calculation

## Formula for adding a Percentage (Gain & addition)

Here is the formula how to apply a percentage to get the percentage combined with the initial amount: Initial amount * (1+((percentage rate)/100)) = Combined total after adding the amount corresponding to the percentage.

The portion corresponding to the amount of the percentage to be added to the initial amount is therefore calculated as follows : Initial amount * (percentage rate/100) = Amount corresponding to the percentage

## Inverse percentage calculation (Reduction or Discount)

## Formula for Percentage Discount

Here is the formula for applying a percentage reduction or discount :
Initial amount * (Percentage)/100 = Percentage result (amount of discount to be applied)

The amount including the reduction is therefore calculated as follows : Initial amount * (100 - Percentage)/100

## Calculations and conversion tools

Instant sales tax calculation for the GST and QST of Québec in 2017.

Instant sales tax calculation for the GST and QST of Québec in 2016.

Reverse sales tax calculation for the GST and QST of Québec in 2017.

Reverse sales tax calculation for the GST and QST of Québec in 2016.

Percentage calculation (Adding or subtract a percentage)

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