GST Calculator (India)
GST Calculator (India)
Add GST to a price, or take it out of a GST-inclusive price, and see the split into CGST and SGST for a sale within a state or IGST for a sale between states. Rates as restructured from 22 September 2025.
GST
$10,000 before GST, 18%, a sale within one state
Adding and removing GST
- r
- the GST rate in %
- CGST + SGST
- within a state or UT, the rate is split equally: half central, half state (UTGST in a union territory without a legislature)
- IGST
- between states, and on imports, the whole rate is charged as integrated GST
Worked example
$10,000 before GST, 18%, a sale within one state
GST = 10,000 × 18 ÷ 100 = $1,800.00
CGST $900.00 + SGST $900.00
Price including GST = $11,800.00
Going back: 11,800 × 100 ÷ 118 = $10,000.00 before GST
GST on 1,000 at each slab
| Rate | GST added to 1,000 | 1,000 + GST | Price before GST in 1,000 incl. GST | GST inside 1,000 |
|---|---|---|---|---|
| 5% | $50.00 | $1,050.00 | $952.38 | $47.62 |
| 18% | $180.00 | $1,180.00 | $847.46 | $152.54 |
| 40% | $400.00 | $1,400.00 | $714.29 | $285.71 |
How the rates changed, and how to use them
On 3 September 2025 the GST Council’s 56th meeting replaced the four main slabs (5%, 12%, 18% and 28%) with two: a standard rate of 18% and a merit rate of 5%, plus a special rate of 40% for a short list of goods and services. The new rates took effect on 22 September 2025. Tobacco products stayed on their old rates and compensation cess for a time; from 1 February 2026 those moved to 40% (bidis to 18%) and the compensation cess on them was withdrawn. A few narrow rates — 3%, 1.5% and 0.25% — still exist for specific goods, and many items are exempt or nil-rated. Which item falls where is set by CBIC rate notifications and changes from time to time, so this page does not list goods: check the rate on the official notification or your supplier’s invoice. The menu was last checked on 21 September 2026.
Adding GST is a simple percentage. Taking it out of a price that already includes it is where mistakes happen. At 18%, the GST inside $11,800 is $1,800 — 18/118 of the price — and the price before GST is $10,000. Taking 18% of $11,800 gives $2,124, which is wrong by $324. The result panel shows the wrong figure beside the right one when you remove GST, so you can see the difference.
CGST, SGST and IGST. Within one state or union territory, the tax is split equally between the Centre (CGST) and the state (SGST, or UTGST in a union territory without a legislature). When the supplier and the place of supply are in different states, and on imports, the whole amount is IGST. The total is the same either way; what changes is which government receives it and how input tax credit is set off. Whether a sale is intra-state or inter-state depends on the place-of-supply rules, not simply on the buyer’s address.
For a registered business, GST collected is not income, and GST paid on purchases can usually be claimed back as input tax credit, subject to the conditions in the law. Work out margins on prices before GST with the profit margin calculator. Rounding on an invoice follows your billing system; this page shows paise. This page is arithmetic, not tax advice: for classification, exemptions and composition-scheme rates, ask a GST practitioner or chartered accountant.
Frequently asked questions
How do I calculate GST on a price?
Multiply by the rate. 18% GST on $10,000 is $1,800, making $11,800 in all.
How do I remove GST from an inclusive price?
Multiply by 100 ÷ (100 + rate). $11,800 including 18% GST is 11,800 × 100 ÷ 118 = $10,000 before GST, and the GST is $1,800.
What are the GST slabs now?
From 22 September 2025 the main rates are 5% and 18%, with a 40% special rate for a short list of items; a few narrow rates (3%, 1.5%, 0.25%) apply to specific goods. The 12% and 28% slabs were removed as general slabs. Checked 21 September 2026; confirm any item’s rate on the CBIC notification.
When is it CGST + SGST and when is it IGST?
CGST + SGST (or UTGST) for a supply within one state or union territory, split half and half; IGST for a supply between states and on imports. The total rate is the same.
Related calculators
References
- Press Information Bureau, Ministry of Finance. Recommendations of the 56th Meeting of the GST Council, 3 September 2025: a two-rate structure of 18% (standard) and 5% (merit), and a special rate of 40%; rate changes effective 22 September 2025.
- Press Information Bureau. Frequently Asked Questions on the decisions of the 56th GST Council (September 2025).
- CBIC. Notification No. 9/2025–Central Tax (Rate), 17 September 2025, effective 22 September 2025: CGST schedules of 2.5%, 9%, 20%, 1.5%, 0.125%, 0.75% and 14% (the state levy mirrors each).
- GST Council. Monthly newsletter, December 2025; Notification No. 19/2025–Central Tax (Rate) and No. 03/2025–Compensation Cess (Rate), 31 December 2025: from 1 February 2026 pan masala, cigarettes and tobacco products (other than bidis) at 40%, bidis at 18%, and compensation cess on them withdrawn.
- Central Goods and Services Tax Act, 2017, section 9, and Integrated Goods and Services Tax Act, 2017, sections 5 and 7–8: CGST and SGST/UTGST on intra-state supplies, IGST on inter-state supplies and imports.