Select the value you know, enter the value using the easy-to-use keypad, and watch as the other two values are automatically calculated for you.

* Adding GST: Use this when you know the price before GST and want to know how much GST will be added, and what the resulting price will be.

* Removing GST: Use this when you already know the price that includes GST, and you want to know what amount is made up of GST and what will be left when is GST removed.

* GST Only: Use this when you know the GST amount, and you want to find out the original price, both excluding and including GST.

All calculations are based on the current GST rate of 15% (set as at 1 October 2010)