Add 10% GST to a price, or work out the GST inside a total that already includes it. Enter an amount and you get the GST and the GST-exclusive price. The rate is set to 10%, and you can change it. Use it as a GST exclusive calculator to add GST to a price, or as a GST inclusive (or reverse GST / ex GST) calculator to split a GST-inclusive total back into its GST and ex-GST parts.
GST Calculator
Quickly calculate GST for Australian goods and services (default rate: 10%).
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Add GST: price × 1.1Remove GST: total ÷ 11 is the GST
Australia's GST rate is 10%, which works out to 1/11th of any GST-inclusive price. The two examples below show it both ways. For the full breakdown of why it's 11 and not 10, see how to calculate GST in Australia.
Adding GST
Multiply the GST-exclusive price by 1.1
Base price$340.00
× 1.1+ $34.00 GST
Total (incl. GST)$374.00
Removing GST
Divide the GST-inclusive total by 11
Total (incl. GST)$770.00
÷ 11$70.00 GST
Base price (excl. GST)$700.00
Doing this for every receipt gets old fast
Instant Receipts reads the GST off every receipt and invoice automatically the moment you scan it, with no dividing by 11 and no manual splitting for expense claims, BAS prep or spot-checking a supplier's invoice. It's already done by the time you need the number.
GST calculator: frequently asked questions
Switch to "Remove GST (Inclusive)" mode above and enter the total. For example, on a $770 total, $770 ÷ 11 = $70 GST, which leaves $700 as the GST-exclusive price.
Multiply the GST-exclusive price by 1.1 (or add 10% of the price to itself). For example, $340 × 1.1 = $374, meaning $34 of that total is GST.
Divide the GST-inclusive total by 11 to find the GST component, then subtract it from the total to get the price excluding GST. For a $770 total: $770 ÷ 11 = $70 GST, so the GST-exclusive price is $700.
No. Mixing them up is one of the most common GST mistakes. ÷ 1.1 gives you the GST-exclusive price; ÷ 11 gives you just the GST component. "Remove GST" mode above works out both at once, or see the worked examples further down this page.
A GST exclusive calculator adds GST to a price that doesn't have it yet. The "Add GST (Exclusive)" mode above does exactly that. A GST inclusive calculator (sometimes called a reverse GST calculator or ex GST calculator) does the opposite: it splits a GST-inclusive total back into its GST and ex-GST parts, which is the "Remove GST (Inclusive)" mode.
10% by default, which is Australia's standard rate since GST began in July 2000, but you can change the GST Rate field above if you ever need a different percentage.
Yes. The ATO calculates GST payable using the same 1/11th rule: divide the GST-inclusive amount by 11. This calculator uses that exact formula, so the result matches what you'd report on a BAS.
This calculator works out the GST on a single amount, which is useful for spot-checking one purchase, where the GST you find goes toward label 1B (GST on purchases) on your BAS. For a full GST report across every receipt and invoice in a period, Instant Receipts automatically builds a BAS Summary (with ATO labels G1-G20, W1, W2, 1A, 1B, 5B) and a GST Collected vs Paid report from your scanned receipts, with no manual reversing required.
No. It assumes the amount is subject to GST. Some purchases in Australia are GST-free, including most fresh food and basic groceries, health and medical services, education courses, and some childcare, so don't apply GST to those amounts.
Stop working out GST by hand
Instant Receipts detects the GST on every receipt and invoice automatically, then builds your BAS Summary and GST report when it's time to lodge.
