Add or remove GST in seconds
Enter an amount and a GST rate to see the tax, the price before GST and the final price, with a CGST, SGST and IGST breakdown.
- Add GST to a base price, or take GST out of a GST-inclusive price.
- Results update instantly as you type — nothing is uploaded or stored.
What is GST?
GST stands for Goods and Services Tax. It is a tax added to the price of most goods and services, collected at each step of the supply chain and ultimately paid by the final consumer. Countries such as India, Australia, New Zealand, Canada and Singapore all use a GST system, each with its own rates and rules.
This calculator lets you enter any rate, so it works for any GST country. The quick-select rates are the ones used in India.
How to calculate GST
To add GST to a price that does not yet include it:
Total = Price + GST
To remove GST from a price that already includes it:
GST = Total − Price before GST
A common mistake when removing GST is to subtract the rate percentage directly from the total. That gives the wrong answer, because the GST was calculated on the smaller, pre-tax price rather than on the total.
GST rates in India
India simplified its GST structure with changes that took effect on 22 September 2025, replacing the earlier 5%, 12%, 18% and 28% slabs with a simpler set:
| Rate | Typically applies to |
|---|---|
| 0% | Essential items and certain exempt supplies |
| 0.25% | Rough precious and semi-precious stones |
| 3% | Items such as gold and silver |
| 5% | Everyday and essential goods and services |
| 18% | The standard rate for most goods and services |
| 40% | Luxury and sin goods such as tobacco products and certain high-end items |
The old 12% and 28% slabs no longer apply to most items, but you can still type them in as a custom rate to check an older invoice. Rates for specific products are set by the GST Council and can change, so always confirm the rate for your item with the official GST portal or a tax professional.
CGST, SGST and IGST
In India, GST on a sale within one state is split equally between the central government (CGST) and the state government (SGST). For example, 18% GST is charged as 9% CGST plus 9% SGST.
When goods or services move between states, a single Integrated GST (IGST) is charged at the full rate instead. Use the Tax split option above to see the breakdown that matches your invoice.
Please note
This calculator gives estimates for simple percentage-based GST. Rounding rules, cess, reverse charge, composition schemes and product-specific rates can change the amount shown on a real invoice. It is not tax advice, so check the final figures with your accountant or the tax authority.
Is my information safe?
Yes. All calculations run in your browser, and the numbers you enter are never sent to our server or stored. You can read the full details on our Privacy Policy page.