GST Calculator
Add GST to a price, or take it out of a GST-inclusive price — with the CGST + SGST or IGST split.
Your result appears here after you press Calculate.
Indicative calculation for informational purposes only. Tax liability depends on applicable law, taxpayer circumstances and the relevant financial year. Please verify the result before filing.
About this GST calculator
This calculator does the two sums people need most often with GST: adding GST to a price that does not include it, and finding how much of a GST-inclusive price is tax.
Choose whether the sale is within the state or to another state. Within the state the GST is split equally into CGST and SGST; to another state the whole amount is IGST. Only the split that applies is shown, so the two are never mixed up.
How the calculation works
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Adding GST to a price
GST = price × rate ÷ 100. Final amount = price + GST. At 18%, a price of ₹1,000 becomes ₹1,180.
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Taking GST out of a price
GST = inclusive price × rate ÷ (100 + rate). Base amount = inclusive price − GST. At 18%, ₹1,180 contains ₹180 of GST on a base of ₹1,000.
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CGST + SGST or IGST
For a sale within the state each of CGST and SGST is half the rate. For a sale to another state, IGST is the full rate. The total tax is the same either way.
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Rounding
Each tax amount is rounded to the nearest paisa, and the components always add up to the total GST shown.
GST rates in the list
| GST rate | Commonly used for | CGST + SGST |
|---|---|---|
| 5% | Merit rate — essentials and many everyday goods and services | 2.5% + 2.5% |
| 18% | Standard rate — most goods and services | 9% + 9% |
| 40% | Demerit rate — specified luxury and sin goods | 20% + 20% |
| 0% (nil-rated / exempt) | No GST is charged | — |
| 0.25% | Rough diamonds and rough precious stones | 0.125% + 0.125% |
| 1.5% | Cut and polished diamonds | 0.75% + 0.75% |
| 3% | Gold, silver and jewellery | 1.5% + 1.5% |
| 12% (old rate) | For invoices dated before 22 September 2025 | 6% + 6% |
| 28% (old rate) | For invoices dated before 22 September 2025 | 14% + 14% |
For a sale to another state the full rate is charged as IGST. You can also enter any other rate between 0% and 100%.
Figures last checked on 3 October 2026. Tax rules change — the year and rule set used are shown with every result.
What this calculator does not cover
- The calculator does not tell you which rate applies to a product or service. That depends on its HSN or SAC classification and on any exemption.
- Compensation cess and other levies charged on some goods in addition to GST are not included.
- Input tax credit, reverse charge and composition scheme rates are not covered.
- Whether a sale is within the state or to another state depends on the place of supply rules, which you need to decide before choosing the split.
GST returns and registration
Working out the tax on an invoice is the easy part. Reporting it correctly every month or quarter, matching input tax credit and replying to notices is where businesses need help.
GST Return Filing GST Registration GST Notice Reply