Free tool
GST Calculator
Add or extract GST from any amount — either way.
Getting GST wrong on a quote or invoice means you either short-change yourself or over-charge the customer. This works both ways — adding GST to a net amount, or extracting it from a GST-inclusive total.
Enter your numbers and press Calculate to see the result.
How it works
On a GST-exclusive amount, GST = amount × rate. On a GST-inclusive total, the net = total ÷ (1 + rate), and GST is the difference. Enter your local rate above.
Invoices calculate GST for you
Start free — no card required. Lulaworks tracks this for every quote and job automatically.
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