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!

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.

Please feel free to use this script as your require, if you wish to have this script on your own website please post an acknowledgement and link back to this page.

**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.

Hi, I just need to know the calculation method for finding out the amount of GST that has been added when you don’t know what the initial amount was.

eg. the full amount with GST is 149.85, how do I work out what the GST was from this end amount?

I’m told the GST portion is13.62, and the beginning amount was therefore 136.23, but I need to know how it arrived to these amounts.

Thanks

$149.85 / 11 = $13.62 gst

$149.85 – $13.62 = $136.23 before tax.

The GST calculator does this for you above. Just enter $149.85 – click calculate GST.

The second ‘How to Calculate GST the hard way’ explains how GST is calculated (both forwards and back).

Thankyou, I use this site ALL the time, makes my life simple!

Hi Darren, i am all new to this GST, for seven shits the company i contract to takes $30 per shift for car usage =$210 then $12 per shift for what they call excess reduction = $84.00. then they take 5$ GST on the two added together…….

so my question is how do i calculate 5% on the total $294.00.

Thank You

SJ

Sorry, I don’t follow what you’re doing. But 5% of $294.00 is $14.70.

Why do you need 5%?