Australia GST Calculator

1. 01Choose a modeAdd GST starts from a net price. Remove GST starts from a gross, GST-inclusive price. GST amount shows the tax on a net price.
2. 02Enter the amount and rateType the amount. The rate is set to the 10% Australian rate; change it only for a GST-free supply.
3. 03Read net, GST, and grossAll three figures appear together, so you can copy the net, the GST, or the gross price for an invoice or a BAS.

• Add 10% GSTA net price of 100 AUD becomes 100 × 1.1 = 110 AUD, with 10 AUD of GST.
• Find the GST in a priceA gross price of 220 AUD contains 220 ÷ 11 = 20 AUD of GST, so the net is 200 AUD.
• GST amount onlyOn a net price of 100 AUD, the GST is 100 × 0.10 = 10 AUD.

GST is 10%. The ATO gives two shortcuts: multiply the price by 1.1 to add GST, and divide a GST-inclusive price by 11 to find the GST it contains. Some supplies are GST-free or input-taxed; for those, set the rate to 0 or handle them separately, since this tool applies a single 10% rate.

The 10% rate and the multiply-by-1.1 and divide-by-11 shortcuts are from the Australian Taxation Office (ato.gov.au). Last checked 6 July 2026. This tool is an educational estimate and is not affiliated with, endorsed by, or approved by the ATO or any government body. It covers the standard rate only, not GST-free or input-taxed supplies. Rates and rules can change. For a business or tax decision, check the official source or a registered tax agent.

What is the GST rate in Australia?

GST is a flat 10% on most goods and services, administered by the ATO.

How do I add 10% GST?

Multiply the net price by 1.1. For example, 100 AUD becomes 110 AUD, with 10 AUD of GST.

How do I find the GST in a price?

Divide the GST-inclusive price by 11. For example, 220 AUD contains 20 AUD of GST, leaving 200 AUD net.

What are GST-free supplies?

Some goods and services (for example, certain foods and health items) are GST-free. This tool applies one rate, so set the rate to 0 for a GST-free line and check the ATO rules.

Is this official tax advice?

No. It is an educational estimate and is not affiliated with the ATO. For a business or tax decision, use the official source or a registered tax agent.

Is my data stored?

No. The calculation runs in your browser. Nothing you enter is uploaded, saved, or shared.