How it works
Select whether the amount includes GST. For the intra-state scenario, the total tax is split equally into CGST and SGST. For the inter-state scenario, it is shown as IGST. Use the rate applicable to your goods or services.
Worked example
Show example inputs and result
Amount: 10,000 · Applicable GST rate: 18 · Amount entered: Exclusive of GST · Supply type: Intra-state — CGST + SGST.
- Amount including GST
- ₹11,800.00
- Amount before tax
- ₹10,000.00
- Tax amount
- ₹1,800.00
- CGST
- ₹900.00
- SGST
- ₹900.00
Questions and answers
Does the tool determine the correct GST rate?
No. The displayed rate is an example. Classification, place of supply, exemptions and current notifications determine the actual treatment. The tool only applies your inputs.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method sources: cbic-gst.gov.in
Method reviewed: October 8, 2026 · Methods & accuracy