Making GST simple for every Australian business
GST calculations shouldn't require a subscription, a sign-up form, or a 15-step tutorial. GSTCalc.au exists because we needed a fast, reliable GST tool ourselves — and couldn't find one that respected our time.
Why this exists
Every GST calculator we found was either buried in ads, locked behind a paywall, or built as a lead-gen tool for accounting software. We wanted something simpler: type a number, see the answer, copy it, move on.
What you get
Instant results
No submit button. Results appear as you type, both add and subtract GST at once.
Always accurate
The standard 10% ATO rate, with the option to adjust for edge cases. Calculations match ATO guidelines exactly.
Free, permanently
No subscription, no freemium tier, no "upgrade to pro." The calculator is the product, and it's free.
Private by design
Every calculation runs in your browser. We don't store your figures, track your usage, or sell your data.
Built by Empyreal Creative
GSTCalc.au is built and maintained by Empyreal Creative, an Australian digital studio. We build practical tools for Australian businesses.
Found a bug or have a suggestion? Let us know.