GST Calculator (India) Widget

Add an India GST calculator to your website. Visitors choose or type the GST rate for their item's HSN or SAC code, add GST to a price or extract it from a GST-inclusive amount, and see the tax split into CGST and SGST for intra-state supply or shown as IGST for inter-state supply.

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<iframe src="https://a2z.tools/embed/w/gst-calculator" title="GST Calculator (India) by A2Z Tools" width="100%" height="600" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

A plain iframe. Works everywhere, including site builders that strip scripts. Adjust height if your content needs more room.

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How it works

There is no single GST rate, so the widget starts with no rate selected: the visitor picks one of the goods rate schedules in force or types the rate for their HSN (goods) or SAC (services) code. The presets are the six rate schedules of CBIC Notification No. 9/2025-Central Tax (Rate) and its IGST twin 9/2025-Integrated Tax (Rate), in force from 22 September 2025: 5% (Schedule I), 18% (II), 40% (III), 3% (IV), 0.25% (V) and 1.5% (VI). The 28% Schedule VII, which kept pan masala and tobacco products at their old rate, was omitted from 1 February 2026 by Notification No. 19/2025-Central Tax (Rate). The tax arithmetic is the same A2zCalc engine that powers the A2Z GST Calculator: in add mode GST is the amount times the rate; in extract mode the taxable value is the amount divided by (1 + rate), so 18% GST inside 11,800 is 1,800, not 2,124. For a supply within one state or union territory the GST is shown as equal CGST and SGST (or UTGST) halves - the central-tax schedules are exactly half the integrated rates - and for a supply between states it is shown as IGST.

Calculation method

  • Add GST: GST = A x R / 100; total = A + GST (A = amount excluding GST, R = rate in %)
  • Extract GST: taxable value = A / (1 + R / 100); GST = A - taxable value (A = amount including GST)
  • Intra-state: CGST = SGST/UTGST = GST / 2, each at R / 2 %
  • Inter-state: IGST = GST at R %
  • Rounding: calculated unrounded, each figure displayed to 2 decimals, so the two displayed halves can differ from the displayed total by 0.01

Worked examples

Adding 18% GST within a state

Inputs: Amount 25,000; add GST; rate 18% (chosen by the user for their item); intra-state

Result: Total 29,500.00; GST 4,500.00 = CGST 2,250.00 (9%) + SGST 2,250.00 (9%)

25,000 x 0.18 = 4,500, split equally.

Extracting 18% GST from an inter-state invoice

Inputs: Amount 2,360 including GST; rate 18%; inter-state

Result: Taxable value 2,000.00; IGST 360.00

2,360 / 1.18 = 2,000; the tax is 360, not 18% of 2,360 (424.80).

Extracting 5% GST

Inputs: Amount 1,050 including GST; rate 5%; intra-state

Result: Taxable value 1,000.00; CGST 25.00 (2.5%) + SGST 25.00 (2.5%)

1,050 / 1.05 = 1,000.

GST rates are set by the GST Council and notified by CBIC, and they change. The rate depends on your item's HSN/SAC classification: confirm it in the current notification. This widget is a calculator, not tax advice.

Limitations

  • Does not classify goods or services or look up the HSN/SAC rate; the user must supply the applicable rate.
  • No compensation cess, health cess, excise duty, TCS/TDS or reverse-charge handling.
  • Does not apply exemptions, concessional rates conditional on end use, or composition-scheme rates.
  • Rounds only for display; GST invoices may round tax per line or to the rupee, so totals can differ by a paisa or rupee.

Where publishers use it

  • Indian accounting, tax-filing and CA firm websites
  • Small-business and freelancer blogs explaining how to raise a GST invoice
  • Online sellers' pages showing buyers the tax inside an MRP-style inclusive price
  • B2B price lists where buyers need the IGST figure for inter-state orders

Questions

Which GST rate should I use?

The rate notified for your goods under their HSN code, or for your service under its SAC. Since 22 September 2025 most goods fall in the 5% or 18% schedules and a short list in the 40% schedule, with 3% for gold, silver and jewellery (Schedule IV), 0.25% for rough diamonds and precious stones (Schedule V) and 1.5% for other diamonds (Schedule VI); services have their own rate notification. Look the code up in the current CBIC notification - this widget does not look it up and does not assume a rate.

Where did 12% and 28% go?

The GST Council's 56th meeting (3 September 2025) replaced the four main slabs with 5% and 18% plus a 40% rate from 22 September 2025. The 28% schedule stayed only for pan masala and tobacco products until 1 February 2026, when Notification No. 19/2025-Central Tax (Rate) moved them to 40% (bidi to 18%) and omitted it. For an older invoice or an item you know is taxed at another rate, choose 'Type the rate'.

When is it CGST + SGST and when is it IGST?

Under sections 7 and 8 of the IGST Act, a supply is intra-state when the supplier's location and the place of supply are in the same State or Union territory; then CGST and SGST (or UTGST) are charged in equal halves. When they are in different States, or it is an import, the whole tax is IGST.

How do I remove GST from an inclusive price?

Divide by (1 + rate). At 18%, an inclusive price of 11,800 has a taxable value of 10,000 and GST of 1,800. Taking 18% of 11,800 would overstate the tax by 324.

Does it handle compensation cess?

No cess is added. Compensation cess was removed on all goods except pan masala and tobacco products from 22 September 2025 and on those from 1 February 2026. The separate health and national-security cess on pan masala and the additional excise duty on tobacco are outside GST and not calculated here.

Can I preset a rate for my shop's products?

Yes: v_rate=18 selects a schedule, or v_rate=custom&v_custom=12 fixes any other rate. Older embeds that preset 12 or 28 now open with the rate unselected, so the visitor must choose.

Sources

  1. Recommendations of the 56th Meeting of the GST Council (press release, 3 September 2025) - Press Information Bureau, Ministry of Finance . Two-rate structure of 18% and 5% with a 40% de-merit rate; rate changes effective 22 September 2025; tobacco and pan masala kept at old rates plus cess until the compensation-cess loans are repaid. Fetched 2026-10-01.
  2. Notification No. 9/2025-Integrated Tax (Rate), 17 September 2025 (as corrected 18 September 2025) - CBIC, Government of India (ICAI GST & Indirect Taxes Committee compilation hosted on cbic.gov.in) . IGST 5% (Schedule I), 18% (II), 40% (III), 3% (IV), 0.25% (V), 1.5% (VI), 28% (VII); in force from 22 September 2025. The CBIC tax-information portal is a script-driven app our fetch could not read, so this CBIC-hosted compilation was used; the CGST twin is Notification No. 9/2025-Central Tax (Rate) at half these rates.
  3. GST Council Newsletter, September 2025 (78th edition) - GST Council Secretariat . Lists Notification 9/2025-CTR (Schedules I-VII, from 22.09.2025) and Notification 02/2025-Compensation Cess (Rate) removing cess on all items except pan masala, gutkha, cigarettes and chewing tobacco from 22.09.2025.
  4. GST Council Newsletter, December 2025 (81st edition) - GST Council Secretariat . Notification 19/2025-CTR (31.12.2025): biris to 18%, pan masala and tobacco products to 40%, Schedule VII (14% CGST) omitted, and Notification 03/2025-Compensation Cess (Rate) setting cess to Nil - all from 1 February 2026.
  5. GST Council Newsletter, April 2026 (85th edition) - GST Council Secretariat . Notification 01/2026-CTR (30.04.2026) moved some beverages between Schedules I and III; no new rate schedules. Latest newsletter published as of 2026-10-01.
  6. The Integrated Goods and Services Tax Bill, 2017 (clauses 7 and 8, enacted as sections 7 and 8 of the IGST Act) - CBIC, Government of India . Inter-state and intra-state supply definitions behind the IGST versus CGST + SGST split. This is the Bill as introduced; the enacted Act text on India Code could not be fetched (HTTP 403/504).

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A2Z Tools GST Calculator (India)
https://a2z.tools/gst-calculator

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