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Calculate GST on any amount using the current two-slab structure (5% & 18%, plus 40% on luxury/sin goods) or the pre-22-Sep-2025 rates. Add GST to a base price or extract GST from a total, with the CGST/SGST split or IGST.
Last updated 5 September 2026
Base amount
₹1,000
Total GST
₹180
Total amount
₹1,180
The price you are working with.
Exclusive = the amount is before GST. Inclusive = GST is already in the amount and should be extracted.
Use the current (from 22 Sep 2025) slabs or the earlier ones, then select the rate. The base, GST, CGST/SGST split and total update instantly.
Exclusive: GST = A × R ÷ 100. Inclusive: Base = A × 100 ÷ (100 + R)
For intra-state supply, CGST = SGST = GST ÷ 2. For inter-state supply, IGST = GST.
GST = 1000 × 18 ÷ 100 = ₹180, split equally into CGST ₹90 and SGST ₹90. The invoice total becomes ₹1,180. To reverse: 1180 × 100 ÷ 118 = ₹1,000 base.
The 2025 rationalisation collapsed the four-slab structure into two main rates — 5% (merit) and 18% (standard) — plus a 40% demerit rate for luxury and sin goods. Most 12% items (packaged foods, utensils, many medical items) moved to 5%; most 28% items (ACs, TVs, refrigerators, small cars, cement) dropped to 18%; high-end cars, aerated drinks, online gaming and tobacco moved to 40%.
The old 28%-plus-compensation-cess treatment is now folded into the flat 40% rate for most goods, so there is no separate cess to add (tobacco is an exception). Special rates are unchanged — 3% on gold and silver, 0.25% and 1.5% within the diamond trade.
A frequent error is applying the GST rate to a price that already includes GST, as if it were exclusive — this overcharges the customer by effectively taxing the tax. If a supplier tells you "the price is ₹1,180 including GST", that 1,180 is the inclusive amount; use inclusive mode to correctly extract the ₹1,000 base and ₹180 GST rather than adding another 18% on top of 1,180.
This mix-up is easy to make when copying a rate calculation from an exclusive-pricing template onto an inclusive quote, so it is worth double-checking which mode matches how the price was actually quoted before finalising an invoice.
For a sale within the same state, GST is split equally into Central GST and State GST. For a sale across state lines, a single Integrated GST is charged at the full rate instead.
Choose “inclusive”. The calculator divides by (100 + rate) and multiplies by 100 to find the pre-GST base, then shows the GST portion.
It depends on the item's HSN/SAC classification. Since 22 September 2025 the main slabs are 5% and 18%, with 40% for specified luxury and sin goods. Check the official rate finder for your specific item.
So you can compute GST on invoices dated before 22 September 2025 — which still used the 12% and 28% slabs — as well as current ones. Switch it to "Before 22 Sep 2025" to bring back the older rate chips.
For most goods, no — under GST 2.0 the old 28%-plus-cess treatment was consolidated into the flat 40% rate. Tobacco and a few notified items are exceptions that still carry a separate cess, which this calculator does not compute.
Yes — the calculation itself is identical for goods and services; only the applicable rate differs, based on the specific service's SAC classification.
Yes — inclusive mode extracts exactly the base amount and GST component from a purchase invoice total, which is what you need when recording input tax credit.
This calculator provides estimates for general information only. Results are mathematical calculations based on the figures you enter and standard formulas. Actual bank, loan, deposit and investment products may differ due to fees, rounding conventions, day-count methods and changing rates and rules. Projected investment returns are not guaranteed and you may get back less than you invest. Nothing here is financial, tax or investment advice — verify the actual terms with the relevant institution or a qualified adviser before making a decision. See our full disclaimer.