GST Calculator
Work out CGST, SGST and IGST for any amount — GST-inclusive or exclusive — across the 0%, 5%, 18% and 40% slabs.
Result
How GST is calculated
GST is charged as a percentage of the taxable value of goods or services. If a price is GST-exclusive, the tax is added on top: for a ₹1,000 item at 18%, GST is ₹180 and the total is ₹1,180. If a price is GST-inclusive, the tax is already inside the number, so you work backwards: a ₹1,180 GST-inclusive amount at 18% contains ₹180 of GST on a ₹1,000 base.
CGST, SGST and IGST
For a supply within the same state (intra-state), GST is split equally into CGST (central) and SGST (state) — so 18% becomes 9% + 9%. For a supply between different states (inter-state), the whole amount is charged as IGST. This calculator handles both; pick the supply type to see the right breakup.
GST 2.0 slabs
This calculator supports the current 0%, 5%, 18% and 40% slabs. Not sure which rate applies to your product or service? Check the official GST rate finder, then come back to work out the numbers.
Turn the numbers into an invoice
Once you know the tax, raise a compliant bill with the GST invoice generator — it applies the same CGST/SGST/IGST logic automatically across all your line items.