GST Calculator
Calculate GST for tax-exclusive and tax-inclusive prices. Enter the amount, GST rate, and choose whether your price already includes GST.
Calculator
How to use
A quick, step-by-step guide to get your result in seconds.
- Choose whether your price is GST-exclusive or GST-inclusive.
- Enter the amount and GST rate.
- Click Calculate to see the net price, GST amount, and total.
In-depth guide
GST calculation formulas
Exclusive: GST = amount × rate, total = amount + GST.
Inclusive: net = amount ÷ (1 + rate), GST = amount − net.
When to use inclusive vs exclusive
Use exclusive when you have a base price and need to add GST.
Use inclusive when you have a final price and want to extract the GST portion.
FAQ
Answers to the most common questions about this calculator.
What is GST-inclusive vs GST-exclusive?
GST-exclusive means tax is added on top of the price. GST-inclusive means tax is already included in the price.
Can I use this for VAT?
Yes. The same math applies to VAT when you enter the correct rate.
Why is there no currency symbol?
This calculator is generic, so enter amounts in your preferred currency.