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India GST Calculator for CGST, SGST and IGST

Add or remove India GST from an amount using common GST slabs, inclusive or exclusive pricing, intra-state CGST/SGST, inter-state IGST, or international/export treatment notes.

India GST

Choose the GST slab, then split or verify the tax route

India GST invoice math starts with the rate you have already verified for the supply. The calculator supports common GST slabs such as 0%, 3%, 5%, 12%, 18%, and 28%, then adds GST to an exclusive price or removes GST from an inclusive price.

For an intra-state supply, the GST amount is split equally into CGST and SGST. For an inter-state supply, the same GST amount is shown as IGST.

For international or export scenarios, the calculator keeps the selected-rate GST math visible but does not assume a domestic split. Place of supply, zero-rating, LUT or IGST route, customs, and filing facts must be verified.

For example, a Rs 1,000 amount before GST at 18% gives Rs 180 GST and Rs 1,180 total. Intra-state shows Rs 90 CGST and Rs 90 SGST; inter-state shows Rs 180 IGST; international/export mode flags the tax route for verification.

Before using the result

  • Select the GST rate only after checking HSN, SAC, exemption, and official rate guidance.
  • Use Before GST for net prices and GST inclusive when the entered price already includes tax.
  • Select intra-state for CGST plus SGST, inter-state for IGST, or international/export when the route must be verified.
  • Confirm invoice, return, input-credit, cess, and place-of-supply treatment before filing.

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FormulaGST amount = base amount x GST rate / 100; inclusive base = GST-inclusive amount / (1 + rate / 100); intra-state split = CGST + SGST; inter-state split = IGST; international/export treatment must be verified

Formula

India GST add/remove formula

This calculator does not choose the correct GST rate or classification. Confirm rates, exemptions, and compliance rules from official GST sources.

GST amount = base amount x GST rate / 100; inclusive base = GST-inclusive amount / (1 + rate / 100); intra-state split = CGST + SGST; inter-state split = IGST; international/export treatment must be verified

At 18% GST, 1,000 before GST has 180 GST and total 1,180. For an intra-state supply, that is 90 CGST and 90 SGST; for an inter-state supply, it is 180 IGST. International/export treatment depends on place of supply and filing facts.

SourcesThis profile covers a dedicated India GST add/remove calculation. The calculator applies the GST rate selected by the user and does not determine the correct HSN, SAC, exemption, or place-of-supply treatment.

Sources and assumptions

India GST source notes

This profile covers a dedicated India GST add/remove calculation. The calculator applies the GST rate selected by the user and does not determine the correct HSN, SAC, exemption, or place-of-supply treatment.

Effective year
2026
Last verified
2026-06-23

This calculator does not choose the correct GST rate or classification. Confirm rates, exemptions, and compliance rules from official GST sources.

Official and reference sources

Assumptions

  • The user selects the GST rate that applies to the supply.
  • Exclusive mode treats the entered amount as before GST.
  • Inclusive mode treats the entered amount as already including GST.
  • The same GST rate applies to the whole amount.

Not included

  • HSN/SAC classification, exemptions, reverse charge, input tax credit, composition scheme, and place-of-supply rules.
  • International, import, export, zero-rated, LUT, refund, and customs treatment beyond the visible selected-rate calculation.
  • UTGST and detailed GST return reporting beyond the simple CGST/SGST or IGST split for the selected rate.
  • Cess, late fees, penalties, e-invoicing, returns, and compliance workflow.
FAQ7 common questions for this calculator.

FAQs

Can this remove GST from a GST-inclusive price?+

Yes. Select inclusive mode to split an amount into price before GST and GST amount.

Does this show CGST, SGST, and IGST?+

Yes. Select intra-state supply to split GST into equal CGST and SGST values, inter-state supply to show the same GST amount as IGST, or international/export to keep the selected-rate GST math visible while flagging the route for verification.

Does this decide the right HSN or GST rate?+

No. Select the rate that applies to your goods or services after checking official guidance.

How does the India GST Calculator calculate the result?+

For the India GST Calculator, it uses the India GST add/remove formula: GST amount = base amount x GST rate / 100; inclusive base = GST-inclusive amount / (1 + rate / 100); intra-state split = CGST + SGST; inter-state split = IGST; international/export treatment must be verified. At 18% GST, 1,000 before GST has 180 GST and total 1,180. For an intra-state supply, that is 90 CGST and 90 SGST; for an inter-state supply, it is 180 IGST. International/export treatment depends on place of supply and filing facts.

What information do I need to use the India GST Calculator?+

For the India GST Calculator, enter an amount. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the India GST Calculator?+

India GST Calculator is accurate for the rates, amounts, dates, and rules entered. It uses the India GST add/remove formula shown on this page. Real products can differ because of fees, taxes, contract terms, or changing official thresholds.

What should I check before using the India GST Calculator result?+

For the India GST Calculator, check an amount, then compare the India GST add/remove formula and worked example with the contract or source you will rely on. Fees, tax year, currency, and payment timing can change the final decision.

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Finance guide

How to use the India GST Calculator

Add or remove India GST from an amount using common GST slabs, inclusive or exclusive pricing, intra-state CGST/SGST, inter-state IGST, or international/export treatment notes. The page also explains the india GST add/remove formula and shows a practical example: At 18% GST, 1,000 before GST has 180 GST and total 1,180. For an intra-state supply, that is 90 CGST and 90 SGST; for an inter-state supply, it is 180 IGST. International/export treatment depends on place of supply and filing facts.

  1. 1

    Enter your details

    Enter an amount using common GST slabs, inclusive or exclusive pricing, intra-state CGST/SGST, inter-state IGST, or international/export treatment notes, then complete any other fields shown in the calculator.

  2. 2

    Check the calculation

    Review the result alongside the india GST add/remove formula: GST amount = base amount x GST rate / 100; inclusive base = GST-inclusive amount / (1 + rate / 100); intra-state split = CGST + SGST; inter-state split = IGST; international/export treatment must be verified.

  3. 3

    Compare scenarios

    Change one or more inputs to see how they affect the india GST Calculator result before you use the estimate.