How to calculate GST Price for Bills using Excel formulas

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Formula for adding GST

Let’s start by calculating the GST component of a GST exclusive amount.  To do this you simply multiply the value, excluding GST by 15% or by 0.15.  To find the total including GST simply add the two values together.

In the example below B5 has been multiplied by 0.15, which is the same as 15%. You can type either value into the formula and Excel will give you the correct answer.

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In cell B7 the GST exclusive amount held in B5 and the GST amount held in cell B6 have been added together to give the GST inclusive amount.

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Formula for calculating the total including GST

There are times when you only want to calculate the Total figure including the GST. So let’s now have a look at calculating the total including GST.  

This time we multiply the total by 115% or by 1.15.

In the example below cell B12, which is the figure without GST

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(exclusive figure) is being multiplied by 1.15 to calculate the Total including GST. The same result would have been found if you had used 115% instead of the 1.15.

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