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GST Calculator (Australia)

Add 10% GST to a price, or work out the GST inside a GST-inclusive amount. All figures are in Australian dollars (AUD).

Estimate only. This calculator gives an estimate. Accounter does not lodge BAS or run STP.

Amount excluding GST (AUD)

Excluding GST: $100.00
GST: $10.00
Including GST: $110.00

How the maths works

Add GST: multiply the GST-exclusive price by 10% (or by 1.1 for the total). $100.00 becomes $110.00, of which $10.00 is GST.
Remove GST: divide the GST-inclusive amount by 11 to get the GST. $110.00 ÷ 11 = $10.00 GST, leaving $100.00 excluding GST.

Amounts are rounded to the nearest cent.

Working with bank statements?

Turn a PDF bank statement into a spreadsheet with our bank statement to CSV converter.

Sources: ATO: Goods and services tax (GST) · MoneySmart: GST calculator. Last checked 13 October 2026. Check the ATO for your own circumstances, including GST-free and input-taxed supplies.