GST Calculator — free online tool
You're checking an invoice or pricing something, and you need to know how much of it is GST. Doing that math by hand is fiddly, and it's easy to mix up the price with and without tax. We added a free tool that does it for you — GST Calculator — right in your browser.
What it does
You type in an amount and it adds or removes GST at whatever rate you choose. It comes with country presets, so you can pick the rate your country uses instead of looking it up. Whether you start from the price before tax or the final price, it works out the rest for you.
Nothing leaves your device
The whole thing runs in your browser. The numbers you type stay on your screen — nothing is uploaded to a server and nothing is saved anywhere.
How to use it
- Open GST Calculator and enter your amount.
- Pick whether to add or remove GST, and choose the rate or a country preset.
- Read off the result and use it.
It's free with no limit. There are more small tools on the Apps page.