GST Calculator 2026 — Add or Remove GST Instantly
Work out GST in seconds. Add GST to a base price to get your final invoice value, or remove GST from a total to find the original amount — with a full CGST, SGST and IGST breakdown across every slab.
Add GST or Remove GST?
Use “Add GST” when you have a price before tax and want the final GST-inclusive amount. Use “Remove GST” when you have a GST-inclusive total, like an MRP or invoice value, and want to find the taxable base amount hidden inside it.
Add GST Calculator
Enter your base amount and GST rate to get the tax and final invoice value
Enter the taxable value of the goods or service, excluding GST.
Intra-state splits the GST equally between CGST and SGST. Inter-state charges the full rate as IGST.
Add GST Result
GST amount, tax split, and final invoice value
Enter your base amount and GST rate, then click Calculate GST Amount to see your final price.
Remove GST Calculator
Enter your GST-inclusive total to find the base amount and tax portion
Enter the final amount actually paid or shown on the invoice/MRP, including GST.
Intra-state splits the GST equally between CGST and SGST. Inter-state charges the full rate as IGST.
Remove GST Result
Base amount, GST amount, and tax split
Enter your total amount and GST rate, then click Calculate Base Amount to see the breakdown.
GST Slab Rates
Common GST rate slabs applied to goods and services in India. Always confirm the exact rate for your specific goods/service (HSN/SAC code) on the official GST portal before invoicing.
| Slab | CGST + SGST (Intra-state) | IGST (Inter-state) | Typical Items |
|---|---|---|---|
| 0% | 0% + 0% | 0% | Fresh produce, books, milk |
| 0.25% | 0.125% + 0.125% | 0.25% | Rough precious/semi-precious stones |
| 3% | 1.5% + 1.5% | 3% | Gold, silver, jewellery |
| 5% | 2.5% + 2.5% | 5% | Packaged food, transport, medicines |
| 12% | 6% + 6% | 12% | Processed food, mobiles, business class air travel |
| 18% | 9% + 9% | 18% | Most goods & professional services |
| 28% | 14% + 14% | 28% | Cars, tobacco, aerated drinks (+ cess) |
GST Calculator FAQ
Everything you need to know before calculating GST on your invoices in 2026.
To add GST, multiply the base amount by the GST rate and add it to the original amount: GST Amount = Base Amount × (Rate ÷ 100), and Total = Base Amount + GST Amount. For example, on ₹1,000 at 18% GST, the GST amount is ₹180 and the total payable is ₹1,180.
To find the original amount before GST, divide the total by (1 + rate ÷ 100): Base Amount = Total ÷ (1 + Rate ÷ 100). The GST amount is then simply Total minus Base Amount. For example, a total of ₹1,180 at 18% GST has a base amount of ₹1,000 and a GST component of ₹180.
For sales within the same state, GST is split equally between CGST (collected by the central government) and SGST (collected by the state government), each at half the total GST rate. For sales between different states, the full rate is charged as IGST (Integrated GST), collected by the central government and later apportioned to the destination state.
India uses multiple GST slabs depending on the goods or service: 0% for exempt essentials, 5% for basic necessities, 12% and 18% for standard goods and most services, and 28% for luxury and sin goods. Some items also attract an additional GST compensation cess on top of the 28% slab.
GST is calculated on the taxable value, which is the price after deducting any trade discount shown on the invoice, but before adding other charges like packing or transport unless those are billed separately. Discounts given after the sale via credit notes do not usually reduce the taxable value used for GST already charged.
Yes. Use the “Add GST” tab when you have a GST-exclusive base amount and want to know the tax and final price. Use the “Remove GST” tab when you have a GST-inclusive total, such as an MRP or invoice total, and want to work out the original base amount and the GST portion within it.