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GST Calculator India

Calculate GST on a taxable amount for intra-state (CGST+SGST) or inter-state (IGST) supplies. Choose inclusive or exclusive mode. Not official tax advice — verify rates on cbic.gov.in.

GST breakdown (India)

Exclusive or inclusive GST with CGST/SGST (intra-state) or IGST (inter-state) split.

Invoice total

₹0

Taxable base ₹0

Total GST ₹0

CGST ₹90 · SGST ₹90

Useful for

InvoicesQuotesIntra-stateInter-state

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Privacy & limitations
v1.0.0·Updated 2026-09-25

Files are processed in your browser and are not uploaded to our servers.

Your files stay on your device. We do not store or access your documents.

Guides, tips & FAQ

Formulas

Exclusive: GST = Base × Rate/100 | Inclusive: Base = Total / (1 + Rate/100)

Intra-state: CGST = SGST = GST/2. Inter-state: IGST = GST. Product-specific rates and cess are not modelled.

Worked example
  • Exclusive ₹1,000 at 18% intra-state.
  • GST = 180; CGST = SGST = 90; total = ₹1,180.
  • ₹1,180 invoice total
Rate notes

Standard GST rate bands commonly used for educational GST maths. Product-specific rates, exemptions, and cess may differ. Always verify on CBIC before invoicing or filing.

Frequently asked questions

Frequently Asked Questions

How to read the GST split

Enter a base amount or a tax-inclusive total and a rate. Exclusive mode adds GST on top: GST = base × rate / 100. Inclusive mode removes GST from a total: base = total / (1 + rate / 100). Intra-state splits that GST into equal CGST and SGST. Inter-state shows the full amount as IGST.

The rate table on the page is a short set of common slabs for illustration. It does not apply cess, special product notifications, or composition-scheme rules. It does not file GSTR.

How to use it

  1. Choose exclusive if you have a pre-tax amount, or inclusive if you have a tax-included total.
  2. Enter the amount and the GST rate from the invoice, not from memory if the notification lists a different rate.
  3. Choose intra-state or inter-state so the split matches the supply.
  4. Use the invoice generator if you need a line-by-line PDF, or GST return prep for a month of supplies.

The amount stays in this browser tab. It is not uploaded and it is not sent to the GST portal.

Questions

What is the difference between CGST+SGST and IGST?
Intra-state supplies split the GST into CGST and SGST, each half of the rate. Inter-state supplies charge IGST at the full rate.
Does this include compensation cess?
No. Cess and product-specific exceptions are not calculated.
Is the result a tax invoice?
No. It is arithmetic on one amount. An invoice needs the invoice generator and your own GSTIN details.