GST calculator
Add GST to a price, or find how much GST is inside a total, with the CGST, SGST or IGST split.
Example result
- GST amount
- ₹1,800.00
- Amount before GST
- ₹10,000.00
- Amount including GST
- ₹11,800.00
Tax breakdown
| Amount | |
|---|---|
| Amount before GST | ₹10,000.00 |
| CGST @ 9% | ₹900.00 |
| SGST / UTGST @ 9% | ₹900.00 |
| Total GST | ₹1,800.00 |
| Amount including GST | ₹11,800.00 |
How this is calculated
Adding GST: GST = amount × rate ÷ 100; total = amount + GSTRemoving GST: GST = total × rate ÷ (100 + rate); amount = total − GST
Within a state (or union territory) the GST is split equally into CGST and SGST/UTGST. Between states it is charged in full as IGST. Amounts are rounded to the nearest paisa, and CGST + SGST always add up to the total GST.
The rate list comes from FID's rates table. The current list has been in force since 22 Sep 2025 (source: cbic-gst.gov.in). It shows the general slabs only. The rate for a particular product or service depends on its HSN or SAC code, so check the CBIC notification for your item. Special rates for some items, such as precious metals, are not listed. Cess, reverse charge, composition schemes and input tax credit are not covered.
Questions
How do I add GST to a price?
Multiply the price before GST by the rate. At 18%, ₹10,000 becomes ₹10,000 + ₹1,800 = ₹11,800.
How do I find the GST inside a total?
GST = total × rate ÷ (100 + rate). At 18%, a ₹11,800 total contains ₹11,800 × 18 ÷ 118 = ₹1,800 of GST. Do not just take 18% of the total; that overstates the tax.
When is it CGST + SGST and when is it IGST?
When the supplier and the place of supply are in the same state or union territory, GST is split equally into CGST and SGST (or UTGST). When they are in different states, the whole amount is IGST. The total is the same either way.
Which rate applies to my product or service?
It depends on the item's HSN or SAC code. Check the rate notified by CBIC for that code. FID lists the general slabs in force; it does not classify items.
Estimates for educational purposes only. Not financial, tax or investment advice.