GST Calculator
Calculate GST amount and final price. Choose whether you want to add GST to a base price or remove GST from a GST-inclusive price.
How GST is calculated
- Add GST: Final = Base × (1 + GST% ÷ 100)
- Remove GST: Base = Inclusive ÷ (1 + GST% ÷ 100)
- GST Amount = Final − Base
Tip: For invoices, always confirm whether your pricing is GST-inclusive or exclusive.