Business & Work
Australia GST Calculator - Add or Remove 10% GST
Add or remove Australian GST - 10% rate pre-filled, both directions.
Free to useNo sign-up requiredNo watermarkRuns in your browser
Last reviewed: 30 September 2026 by Vishal Senthilkumar
Australia's GST rate is 10%. This calculator has it pre-filled, so you can go straight to entering an amount. A number of items - including most basic food, health and education - are GST-free rather than taxed at the standard rate.
It works in both directions: add GST to a price, or work out the GST-exclusive amount and the GST itself from a GST-inclusive price. The commonly cited "divide by 11" trick for removing GST is exactly what dividing by 1.10 does - both give the same answer.
How this tool works
Choose add or remove
Adding GST to a price and extracting it from a GST-inclusive price are different calculations.
The 10% rate is already set
Tap 0% instead for GST-free goods and services.
Enter the amount
The GST-exclusive price if adding GST, or the total if removing it.
How it works
Adding GST multiplies the amount by 10% and adds it on. Removing GST divides the GST-inclusive total by 1.10 to get the GST-exclusive amount - the same result as the "divide the total by 11" shortcut, since 1/11 of a GST-inclusive total equals 10% of the GST-exclusive amount.
GST-free items (most basic food, many health and education services) are a separate category from GST being merely "removed" - they are not taxed at all.
Worked examples
A$100 plus 10% GST
GST is A$10, so the total charged is A$110.
An A$110 price that already includes GST
The GST-exclusive amount is A$100 and the GST is A$10 - the same as dividing A$110 by 11.
Frequently asked questions
What is the GST rate in Australia?
10%.
Why do people say "divide by 11" to remove GST?
Because dividing a GST-inclusive total by 11 gives the same GST amount as dividing the total by 1.10 and subtracting - both are correct ways of expressing the same 10% calculation.
Is this official ATO guidance?
No - this is a general calculation tool. Confirm the correct GST treatment for your specific goods or services with the ATO or an accountant.