Australia's Most Trusted
Free GST Calculator
GST-Calculator.com.au was built with one goal: give every Australian business owner and sole trader a fast, accurate, completely free GST calculator — no signups, no ads, no complexity.
Australia's GST system has been running at a flat 10% rate since July 2000. Yet we still see business owners making calculation errors, overpaying accountants for basic math, or using slow, outdated tools. We built this to fix that.
Our mission
To make GST compliance simple, instant, and accessible for every Australian — from a cafe owner in Melbourne to a freelancer in Perth.
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Monthly calculations
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Free forever
10%
ATO rate always current