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.
you are the coolest i hate maths…you did it for me
Thank you very very much, i use it every day.
how good to google my query and get something like this to use. thanks for sharing your talents with us dumb ones!!!!
I use this all the time, Thanks 🙂
Thank you so much for sharing this, it’s fantastic!
Fantastic – and thankyou for sharing. Very Helpful
Being a student of accounting I really appreciate this free site. I will be using this for a long long time
Thanks SO SO much!
Thanks so much for you generosity – this is a real timesaver.
Nice to come along a gold nugget like this! Much Appreciated!!!!
fantastic, its a dream come true
Thank you so much. This saved my so much time.
Thank you so much – very helpful since I am “numerically challenged”!!!
You’ve just saved my life! Thank you for being so generous and making this available to everybody.
Was very helpful, thanks
This is great, I use this at work nearly everyday.
Thank you for your great GST calculator, very generous of you to share it.
If it helps, I’m happy to have it here for everyone. 🙂
You should be charging for this ,it is the easiest way i have calculated my GST ever, well done, love it ,thanks so much
thank you so much for this quick and accurate resource!
Was very helpful, thanks very much!
u save my life! thank u!
Love you GST calculator, especially the both options – to subtract and add GST, saves time 🙂
Fantastic – easy – thanks – will be sure to use again !
Thanks heaps for the GST calculator, it is solid gold, and it is very kind of you to have it here on the website.