GST Calculator
Add or extract Goods and Services Tax in seconds. The GST calculator works in exclusive mode (add tax to a base price) or inclusive mode (pull tax out of a total price) and supports common rates plus any custom percentage.
$0
GST Amount
$0
Base / Pre-GST
$0
Total / Post-GST
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How to Use the GST Calculator
- Choose Add GST (exclusive, add to a base price) or Remove GST (inclusive, extract from a total).
- Enter the amount.
- Choose a GST rate or enter a custom value.
- Click Calculate to see the GST amount, pre-GST amount, and post-GST total.
Formula Used
Remove: Base = Total / (1 + Rate/100), GST = Total − Base
Example: Removing 18% GST from $1,180 gives a $1,000 base and $180 GST.
Frequently asked questions
Everything you need to know about this calculator.
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