GST Calculator (India)
This GST calculator adds Indian Goods and Services Tax to a net price or takes it out of a GST-inclusive amount – and splits it into CGST and SGST for sales within a state, or shows it as IGST for sales between states. Example: ₹10,000 at 18% GST comes to ₹11,800: ₹900 CGST plus ₹900 SGST.
Example: Amount 10,000 ₹ · GST rate: 18% (standard rate) · The amount is: without GST (add GST) · Type of supply: within one state (CGST + SGST/UTGST) → Result: Total = ₹11,800.00 (₹10,000.00 + ₹1,800.00 GST at 18%). Source: GST Council / Ministry of Finance: Recommendations of the 56th Meeting of the GST Council (press release of 3 September 2025; standard rate 18%, merit rate 5%, special rate 40%, effective 22 September 2025). Updated: .
How it is calculated
GST (Goods and Services Tax) is India’s single indirect tax on the supply of goods and services. It is calculated as a percentage of the taxable value and added to the price. Since 22 September 2025 the structure has had two main rates – a standard rate of 18% and a merit rate of 5% – and a special rate of 40% for a small number of goods and services. Further rates of 3%, 0.25% and 1.5% apply to specified goods. The last schedule of goods at 28% was removed with effect from 1 February 2026.
Adding GST
GST = price × rate ÷ 100, and total = price + GST. Example: ₹10,000 at 18% → GST = ₹10,000 × 18 ÷ 100 = ₹1,800; total = ₹11,800.
Removing GST from an inclusive price
Price before GST = total ÷ (1 + rate ÷ 100), and GST = total − price before GST. Example: ₹11,800 including 18% → ₹11,800 ÷ 1.18 = ₹10,000; GST = ₹1,800. A common mistake is to take 18% of the inclusive amount: 18% of ₹11,800 is ₹2,124, which is too much. For ₹1,000 including 5% GST the price before tax is ₹952.38 and the GST is ₹47.62.
CGST, SGST and IGST
- Within one state (intra-state supply) the tax is charged in two equal parts: CGST for the Centre and SGST for the state (UTGST in Union Territories). At 18% that is 9% + 9%; at 5% it is 2.5% + 2.5%; at 40% it is 20% + 20%.
- Between states (inter-state supply) and on imports, the whole amount is charged as IGST at the full rate.
The total tax is the same either way – only the columns on the invoice differ. In the example, ₹1,800 is shown either as ₹900 CGST + ₹900 SGST or as ₹1,800 IGST.
Which rate applies?
The rate is fixed by the classification of the item – the HSN code for goods, the SAC code for services – in the rate notifications issued on the recommendation of the GST Council. This calculator therefore lets you pick a notified rate or type any other rate; it does not decide the classification for you. Pan masala, cigarettes and other tobacco products stayed at the earlier GST rates and compensation cess until 31 January 2026. Since 1 February 2026 they are in the 40% rate and bidis in the 18% rate, and the compensation cess on these goods has been withdrawn; other duties on such goods are not part of this calculator.
Frequently asked questions
How do I calculate GST on an amount?
Multiply the amount by the GST rate and divide by 100. For ₹10,000 at 18% the GST is ₹1,800 and the total is ₹11,800.
How do I remove GST from an inclusive price?
Divide the inclusive price by 1 plus the rate as a decimal: ₹11,800 ÷ 1.18 = ₹10,000. The difference, ₹1,800, is the GST. Do not take 18% of the inclusive price – that gives ₹2,124 and is wrong.
What is the difference between CGST, SGST and IGST?
On a sale within one state the tax is split equally between CGST (Centre) and SGST (state). On a sale between states, the full tax is charged as IGST. An 18% rate is therefore 9% CGST + 9% SGST, or 18% IGST.
What are the GST rates in India now?
With effect from 22 September 2025 the main rates are 5% (merit rate) and 18% (standard rate), with a special rate of 40% for a select few goods and services. The rate notifications also list 3%, 0.25% and 1.5% for specified goods. The remaining 28% schedule ended on 31 January 2026.
Is the 12% slab still in use?
The 56th GST Council meeting replaced the earlier four-tier structure with the two main rates of 5% and 18%. If you need to recalculate an older invoice at 12% or 28%, choose “other rate” and enter it.
Sources and legal basis
- GST Council / Ministry of Finance: Recommendations of the 56th Meeting of the GST Council (press release of 3 September 2025; standard rate 18%, merit rate 5%, special rate 40%, effective 22 September 2025)
- GST Council / Ministry of Finance: Frequently Asked Questions on the decisions of the 56th GST Council (effective date, goods that stay at existing rates)
- IGST Act, 2017, s. 5(1): Notification No. 9/2025-Integrated Tax (Rate), 17 September 2025: IGST rates of 5, 18, 40, 3, 0.25, 1.5 and 28 per cent (Schedules I–VII as originally notified)
- GST Council Secretariat: Monthly Newsletter, December 2025 (Notification No. 19/2025-Central Tax (Rate) of 31 December 2025: from 1 February 2026 bidis at 18%, pan masala and tobacco products at 40%, Schedule VII omitted, compensation cess on these goods withdrawn)
- Central Board of Indirect Taxes and Customs: About GST – Concept & Status (CGST, SGST and IGST; IGST on inter-State supplies)
As of: · Editorial policy
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