Australian GST calculator — divide by 11 (free)

A single offline HTML page for GST-registered Australian sole traders.

Type an amount. If the price already includes GST, the GST slice is amount ÷ 11. If you quoted exclusive of GST, it adds 10% on top. Same arithmetic TinyBAS uses on each ledger line.

Double-click gstcalc.html. Works from file://. No account.

Not tax advice. Not an ATO product. Assumes the standard 10% GST rate on a taxable supply and rounds to the nearest cent. GST-free lines are $0 GST classification is yours. Confirm on ato.gov.au.

If you want the running ledger under those slices, TinyBAS is a one-time A$19 download: https://payhip.com/b/Bsukb