GST Calculator
Add GST to a price or remove GST from a GST-inclusive amount — instantly.
About This GST Calculator
GST (Goods and Services Tax) is a consumption tax applied in many countries including Australia (10%), New Zealand (15%), Canada (5% federal), Singapore (9%), and India (5–28% depending on goods). This calculator handles both directions: adding GST to a pre-tax price to find the GST-inclusive total, and removing GST (also called reverse GST or GST extraction) from an already-inclusive price to find the original amount and the GST component.
To add GST: multiply the pre-tax price by (1 + rate/100). For example, $100 + 10% GST = $110. To remove GST from an inclusive price: divide by (1 + rate/100). For example, $110 ÷ 1.1 = $100 original, $10 GST. Use the country preset buttons to quickly load a rate, or type any custom rate. All three result cards are clickable to copy the value to your clipboard.
How to Use
- Choose ➕ Add GST if your price excludes tax, or ➖ Remove GST if your price already includes it.
- Select a country preset or choose a rate using the quick buttons, or type a custom rate.
- Enter your amount — results update instantly.
- Click any result card to copy that value to your clipboard.