GST Inclusive / Exclusive Calculator
Add GST to an exclusive price or extract GST from an inclusive price.
Calculations run in this browser. Values are not submitted to the server.
Result
Formula and assumptions
Exclusive: tax = base × rate. Inclusive: base = total ÷ (1 + rate), tax = total − base.
Example values are shown in the input placeholders. Results use browser number precision unless the tool uses exact integer arithmetic. Check units and assumptions before using a result.