ATO GST Calculator

Use this free ato gst calculator to work out GST as 1/11 of a GST-inclusive price, or add 10% GST to an exclusive price.

How the ato gst calculator works

For a GST-inclusive price, GST = price ÷ 11. For a GST-exclusive price, GST = price × 10% and the total is price × 1.1. Australian GST is 10%.

Frequently asked questions

Why divide by 11?

Because the inclusive price is 110% of the base price, so GST is one eleventh of it.

Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.