GST Calculator
Add or remove GST from any amount at any rate.
About the GST Calculator
The GST Calculator adds GST to a net amount or strips it out of a gross amount at any rate, showing the net, the GST portion and the gross total at once. It saves the back-and-forth maths when you are pricing goods or checking an invoice.
Frequently asked questions
Divide the gross amount by one plus the rate as a decimal — for example, by 1.17 for a 17% rate — to get the net, then subtract that from the gross for the GST portion. The remove mode here does it instantly.
No. The rate and rules differ by country, and some goods are exempt or zero-rated. Enter the rate that applies to your situation rather than assuming a single standard figure.