Australian calculators
Australian GST and
stamp duty calculators
Free calculators built around Australian rules. No sign-up, and calculator inputs stay in your browser. Optional analytics only loads with your permission.
GST calculator
Add GST to a price, or work out how much GST is inside a total.
GST to add
$100.00
Australia's GST rate is 10%. Most goods and services are taxable, but some items (such as basic food and certain health services) are GST-free.
All calculators
Start with GST or jump straight to the stamp duty calculator for your state.
GST calculator
Add 10% GST to a price, or strip GST out of a total — with a full breakdown.
Open calculator → PropertyStamp duty NSW
Estimate transfer duty for a New South Wales property purchase.
Open calculator → PropertyStamp duty VIC
Estimate land transfer duty for a Victorian property purchase.
Open calculator → PropertyStamp duty QLD
Estimate transfer duty for a Queensland property purchase.
Open calculator →More on the way. HECS-HELP repayments, annual leave and long service leave calculators are next on the roadmap.
Built for Australian rules
10% GST, state-by-state transfer duty brackets, and dollar figures in AUD — not a US-centric calculator with the labels changed.
Calculator inputs stay private
There is no account, calculation database or upload. The amounts you enter are processed locally and disappear when you close the tab.
Rates with a paper trail
Every calculator links to the revenue office it is based on and shows the data version, so you can check the source yourself.
Frequently asked questions
Are these calculators free to use?
Yes. Every calculator on this site is free and does not require an account.
Is my data stored anywhere?
No. All calculations run in your browser using JavaScript. The amounts you type are not sent to our servers, and we do not store them.
Why does stamp duty differ between states?
Transfer duty is a state tax. Each state and territory sets its own bracket thresholds, rates and concessions, so the same purchase price can produce a very different duty amount in NSW, VIC and QLD.
Do the stamp duty calculators include first home buyer concessions?
Not yet. The calculators show standard duty. First home buyer exemptions and concessions depend on eligibility rules that vary by state, so they are deliberately excluded to avoid misleading estimates.
How often are the rates updated?
The current data version is 26 October 2026. State revenue offices update thresholds and rates periodically, usually from 1 July, so always confirm the final figure with the relevant authority.