Australia GST Calculator
Add or remove GST and see the net, tax, and gross totals.
Use this calculator to add GST to a price or remove GST from a GST-inclusive total. Select 10%, or 0% only for an amount you have established is GST-free, then review the rounded Australian-dollar totals.
Maximum amount: A$999,999,999.99.
Calculation
Enter a net amount to add GST.
Rates checked 2026-09-24. Check GST guidance on Moneysmart
About Australia GST Calculator
This browser-local calculator applies a selected GST rate to one amount. It can add GST to a net price or extract GST from a gross price. GST treatment depends on what is being supplied; check official guidance for your circumstances.
Frequently Asked Questions
Adding GST starts with a net amount and calculates GST plus the gross total.
Removing GST starts with a gross amount and calculates the net amount and GST included in it.
Choose 0% only when you have established that the amount is GST-free.