Enter the amount
The price before GST, or the GST-inclusive total if you want to remove it.
GST calculator
Enter a price and a GST rate and get the GST amount and the total, or work backwards from a GST-inclusive price. The rate is preset to 10% and you can change it.
- Free
- No sign-up
- Runs in your browser
100% private — the calculation is done in your browser and nothing is sent to any server.
Next step
Keep going with your result in another tool. Nothing is uploaded.
How it works
Set the GST rate
10% is preset; click a rate or type your country's.
Copy the result
You get the price, the GST and the total.
How to calculate GST
To calculate GST, multiply the price by the GST rate as a decimal and add it to the price. At 10%, a price of 100 has 10 of GST and a total of 110. In the calculator above, enter the amount and the rate and the GST and total appear at once. To take GST out of a total that includes it, choose remove GST and the tool divides the total by 1 plus the rate.
GST rates around the world
| Country | Standard GST rate | Note |
|---|---|---|
| Australia | 10% | Many basic foods, some education and health services are GST-free |
| New Zealand | 15% | Applies to almost all goods and services |
| Singapore | 9% | Rose from 8% to 9% in 2024 |
| Canada | 5% | Federal GST; some provinces add HST or provincial tax |
| India | several rates | Different slab rates depending on the product or service |
Formulas
- GST = price before GST × rate
- Price with GST = price before GST × (1 + rate)
- Price before GST = price with GST ÷ (1 + rate)
- GST in a GST-inclusive price = price × rate ÷ (1 + rate)
Examples at 10% GST
| Price without GST | GST | Price with GST |
|---|---|---|
| 10.00 | 1.00 | 11.00 |
| 20.00 | 2.00 | 22.00 |
| 50.00 | 5.00 | 55.00 |
| 100.00 | 10.00 | 110.00 |
| 250.00 | 25.00 | 275.00 |
| 1,000.00 | 100.00 | 1,100.00 |
Tips
- In Australia, a price that includes GST has one eleventh of it as GST, because 10/110 is 1/11.
- Businesses registered for GST charge it on sales and can claim credits for the GST on their purchases.
- Rates and exemptions change; confirm them with your tax authority before filing.
Private by design
The calculation runs in your browser as you type. The amounts you enter are never sent to a server, so you can use real prices, invoices and quotes.
Frequently asked questions
How do I add GST to a price?
Multiply the price by 1 plus the rate. At 10%, multiply by 1.1: 100 becomes 110.
How do I remove GST from a price?
Divide the price by 1 plus the rate. At 10%, 110 ÷ 1.1 = 100, so the GST was 10.
Which countries use GST?
Among others Australia, New Zealand, Singapore, Canada and India. The rate and rules differ in each country, so set the rate you need.
Is this converter free?
Yes. There is no sign-up and no limit, and it runs in your browser, so nothing you type is sent to a server.
Does it work on a phone?
Yes. It works in any modern mobile browser, and the result updates as you type.
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