Add or remove GST from any amount in seconds
GST Calculator
What do you want to do?
GST Rate
Ex-GST Amount
Amount before GST
GST (10%)
Tax component
Inc-GST Amount
Amount including GST
| Country | Rate | Name |
|---|---|---|
| Australia | 10% | GST |
| Canada | 5% | GST |
| India | 5–28% | GST |
| New Zealand | 15% | GST |
| Singapore | 9% | GST |
| UK | 20% | VAT |
| Germany | 19% | MwSt. |
| France | 20% | TVA |
Use this free GST calculator to quickly add GST to a net (ex-GST) amount or remove GST from a gross (inc-GST) price. Supports any rate — 10% for Australia, 15% for New Zealand, 5% for Canada, 18% for India, or a fully custom percentage. Results show the tax component, ex-GST base, and inc-GST total side by side.
Select 'Add GST to amount', enter your ex-GST (net) price and choose your rate. The calculator multiplies the base by the rate and shows you the GST amount plus the total inc-GST price.
Select 'Remove GST from amount', enter the gross (inc-GST) price, then choose the rate. The ex-GST base is calculated as gross ÷ (1 + rate/100). The difference between the gross and the base is the GST component.
It depends on your country. Australia and Canada use 10% and 5% respectively, New Zealand uses 15%, India ranges from 5–28%, Singapore uses 9%, and most EU countries charge 20% VAT. Use the reference table in the tool or enter a custom rate.
When GST is already included in a price, the tax fraction of the gross is rate ÷ (100 + rate). For example, at 10% GST the tax is 9.0909…% of the gross amount, even though it is 10% of the net amount.