GST Calculator India (Add or Remove GST, CGST/SGST/IGST)
Enter the amount, choose the GST rate and whether the price includes GST.
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GST Calculator India (Add or Remove GST, CGST/SGST/IGST) by TheCalcTools
How the GST Calculator India (Add or Remove GST, CGST/SGST/IGST) works
To add GST, multiply the base price by the rate. To remove GST from an inclusive price, divide by (1 + rate): ₹11,800 including 18% GST is ₹10,000 plus ₹1,800 GST.
Within a state, GST is split equally into central (CGST) and state (SGST) tax; between states the whole amount is IGST. From 22 September 2025 most goods and services moved to 5% or 18%, with 40% for a short list of luxury and sin goods; check the HSN or SAC code for your item.
The formula
Worked example
Using the default values shown in the calculator:
| Amount | ₹10000 |
|---|---|
| GST rate | 18% (standard rate) |
| The amount | Excludes GST (add GST) |
| Supply | Within one state (CGST + SGST) |
- ₹10,000 plus 18% GST: GST ₹1800.00, total ₹11800.00.
- CGST ₹900.00 + SGST ₹900.00.
Result:
| Amount before GST | ₹10000.00 |
|---|---|
| GST | ₹1800.00 |
| Total with GST | ₹11800.00 |
| Split | CGST ₹900.00 + SGST ₹900.00 |
Frequently asked questions
What happened to the 12% and 28% slabs?
The GST Council’s September 2025 reform moved almost all 12% items to 5% and most 28% items to 18%, from 22 September 2025.
Is GST charged on GST?
No. GST is calculated on the taxable value, not on other GST.
Sources and further reading
- CBIC (Government of India): GST rates
- BankBazaar: New GST rates list in India 2026
- Wikipedia: Goods and Services Tax (India)
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This calculator gives estimates for information only. It is not tax or legal advice. Tax rules change and depend on your circumstances, so check current rules or ask a qualified professional. See our disclaimer.