GST Calculator
Enter the base amount and select the GST rate. The calculator will show the GST amount and the total, with the CGST/SGST split for intra-state or IGST for inter-state supplies.
How GST Calculation Works
GST is calculated on the base amount (the price before tax). The formula is straightforward:
GST Amount = Base Amount × (Rate ÷ 100)
The total amount payable is:
Total = Base Amount + GST Amount
For intra-state supplies, the GST is split equally between CGST and SGST (each at half the rate). For inter-state supplies, the full rate applies as IGST.
| Total Rate | Intra-State | Inter-State |
|---|---|---|
| 5% | CGST 2.5% + SGST 2.5% | IGST 5% |
| 12% | CGST 6% + SGST 6% | IGST 12% |
| 18% | CGST 9% + SGST 9% | IGST 18% |
| 28% | CGST 14% + SGST 14% | IGST 28% |