About the GST Calculator
The GST Calculator adds or removes GST from any amount in seconds. Enter a price and GST rate to get the net amount, GST amount and gross total — handy for invoices, shopping and accounting.
How to use the GST Calculator
- Enter the amount.
- Choose your GST rate (e.g. 5%, 12%, 18%, 28%).
- See the GST amount and the total with or without GST.
Frequently Asked Questions
How do I add GST to a price?
Enter the base amount and rate; the calculator multiplies the amount by the rate and adds it to give the gross total.
How do I remove GST from a total?
Use the "remove GST" option — it works backwards from the gross amount to show the original price and the GST portion.
Which GST rates are supported?
Any rate you enter, including the common 5%, 12%, 18% and 28% slabs.
Is the GST Calculator free?
Yes, it is free and requires no sign-up.