Is the GST calculator free?
Yes. It is completely free to use, with no signup, no account, and no paywall.
Can I use it on my phone?
Yes. The page works in any modern mobile or desktop browser, with nothing to install, so you can run a quick calculation wherever you are.
Does it stay local?
Yes. The numbers you enter are processed entirely in your browser and never leave your device.
How do I extract the GST from a GST-inclusive price?
Divide the gross by 1 plus the rate as a decimal. At 10%, a 110 inclusive price came from 110 / 1.1 = 100, and the GST component is 10. The common Australian shortcut, dividing by 11, gives the same 10. This tool works only in the other direction.
What GST rate should I enter for my country?
Australia is 10%, New Zealand 15%, Singapore 9%, and India uses slabs of 5, 12, 18, and 28 depending on the goods. Canada charges a 5% federal GST that is often combined with provincial tax into an HST of 13 to 15%. Enter whichever combined rate applies to the supply.
Does it handle Canadian HST and PST?
Only if you add the rates yourself. The tool takes one rate, so enter 13 for Ontario HST rather than running 5% GST and 8% PST separately. Provinces that keep PST separate from GST need the two rates summed.
Does it cover zero-rated or exempt supplies?
No. Basic groceries, exports, and certain financial services are treated differently in most GST regimes, and the tool has no concept of any of that. It multiplies whatever amount you give it by whatever rate you give it.
Can it produce a tax invoice?
No. It returns the GST amount and the total including GST. There are no line items, no supplier fields, and no export, so it is a check figure rather than a document.