Australian GST calculator

Use this Australian GST calculator to add standard 10% GST to a GST-exclusive amount or extract the GST component from a GST-inclusive total. It shows the before-GST price, GST amount and total for a quick small-business check.

GST calculator

AU · 10% GST

Add 10% GST to a taxable price or divide a GST-inclusive total into its estimated pre-GST amount and GST component. The standard-rate calculation is a quick check; GST treatment depends on the supply.

What do you need?

Amount (AUD)

Total including GST

$110.00

GST amount$10.00

Before GST$100.00

Formula: add GST = price × 10%; GST in an inclusive price = total ÷ 11.

What this estimate assumes

Uses the standard 10% rate. GST treatment depends on the supply and your circumstances; not every sale is taxable. Check the ATO guidance on how GST works.

How to use this calculator

Choose whether your starting figure is before or after GST, then enter the amount in Australian dollars. The result shows the GST component and the corresponding total or pre-GST amount.

Formula and example

For a GST-inclusive amount, divide the total by 11 to find the GST component. The remaining amount is the price before GST.

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Guides for this calculator

Frequently asked questions

How do I add GST to a price?

For a taxable amount using the standard rate, multiply the pre-GST price by 1.10 to get the total. The calculator also shows the GST component.

How do I remove GST from a total?

For a fully taxable amount at the standard rate, divide the total by 1.1 to find the pre-GST amount. Divide by 11 to find the GST portion.

Does the GST calculator decide whether I need to charge GST?

No. It performs standard-rate arithmetic only. Supply classification and registration depend on your circumstances; check ATO guidance.

When must an Australian business register for GST?

Registration obligations depend on GST turnover and other circumstances. Check the current ATO registration rules rather than relying on this calculator.