GST Calculator
Use this gst calculator to calculate GST on a price or separate GST from a total. Enter the price, GST rate and whether the amount includes GST and review the GST component and the price before or after GST.
Result
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Base (excl. GST) —
GST amount —
Total (incl. GST) —
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How it works
Add: total = amount × (1 + rate); remove: base = total ÷ (1 + rate)How to use the GST Calculator
Start by entering the price, GST rate and whether the amount includes GST. Keep the units consistent and check that each value belongs to the same question.
The result gives the GST component and the price before or after GST. GST treatment varies by country, transaction and registration status. Use it as a guide and check any instructions, rules or professional advice that apply.
Frequently Asked Questions
What does this gst calculator calculate?
It gives the GST component and the price before or after GST. GST treatment varies by country, transaction and registration status.
What information should I enter?
Enter the price, GST rate and whether the amount includes GST. Use the same units throughout so the result is easier to understand.
Should I enter a GST inclusive price?
Choose the matching option in the calculator so the GST component is separated correctly.