The free online GST and GST Free Portion Calculator! Provided here for your use. Please make sure you report any issues with the calculator in the comments below. Enjoy your calculations!

GST Calculator
 Amount: Subtotal: GST: Total:
GST Free Portion Calculator
 Total: GST Stated: GST Free Amount: GST Component: GST-able: GST: I wrote this simple little script in JavaScript to help me calculate Australian GST (10%) today. Being such a useful little script, I thought I would post it.

How to Calculate GST the hard way (using you know, numbers and shit)

If you have something without GST, and you need it with GST, you add 10%. Which is easilest done on a calculator by multiplying your amount by 1.1 (which is really saying mister Calculator, give me 110% of this amount).

`\$100 * 1.1 = \$110`

To go the other way, let's say we have \$110, which includes 10% GST already. Working out how much is the GST part is quickly done on a calculator by dividing by 11. Not 10 you say? No, 11. Because easiestly explained, before GST you had 10 parts of a number, the "extra" 10% is another "part". So we need to work out what that part is.

`\$110 / 11 = \$10`

Huzzah! We have the GST component of an amount! Now, we need to take that GST part from our original amount of \$110 to get what the amount is without GST.

`\$110 - \$10 = \$100`

Perfect :-)

But seriously, why do all this manual work when this GST calculator does it for you?

Last Updated 04/03/2014: Fixed floating point arithmetic (Loss of 1c on some calculations). Thanks to Michael for pointing it out.