Quick GST formulas
| Australia (10%) | New Zealand (15%) | |
|---|---|---|
| Add GST | price × 1.1 | price × 1.15 |
| GST in a GST-inclusive price | price ÷ 11 | price × 3 ÷ 23 |
| Remove GST | price ÷ 1.1 | price ÷ 1.15 |
Example: a $110 Australian receipt includes $10 GST (110 ÷ 11). A NZ$115 price includes NZ$15 GST.
In Australia, businesses with annual turnover of $75,000 or more must register for GST; in New Zealand the threshold is NZ$60,000.
Sources & review
Checked against these sources on November 10, 2026. Rules and rates can change — always confirm with the official source.
Australia & New Zealand GST Calculator FAQs
Why divide by 11 in Australia?
With 10% GST, the GST is 1/11 of the total price (10 ÷ 110).
Are any items GST-free?
Yes. In Australia most basic food, some health and education items are GST-free. NZ applies GST to almost everything, including food.
Is my information saved or sent anywhere?
No. Everything is calculated in your browser and nothing is sent to a server.