Free Indian GST Calculator
Work out GST on any amount. Add it to a price that's exclusive of GST, or pull it out of an inclusive one. See the CGST, SGST or IGST split and the total, on India's 2025 GST rates.
at 18% on ₹1,000.00
- Base / taxable amount
- ₹1,000.00
- CGST (9%)
- ₹90.00
- SGST (9%)
- ₹90.00
- Total amount
- ₹1,180.00
Estimates for quick checks and quotes. Confirm the exact rate for your HSN/SAC before invoicing.
Work out GST in four steps.
The calculator works out GST on any amount: the tax itself, the CGST/SGST or IGST split, and the total. Use it on a price that's exclusive of GST to add the tax, or on one that's inclusive of GST to pull the tax out.
Enter your amount
Type the figure you want to work with: a base price, a quote you're putting together, or a bill that already includes GST.
Exclusive or inclusive
Pick 'Exclusive' when your amount is before GST and you want to add it on. Pick 'Inclusive' when your amount already has GST in it and you want to pull it out.
Choose the GST rate
Tap 5%, 18% or 40% for the usual slabs, or set a special rate like 3% or a custom percentage of your own.
Read the breakdown
The tax amount, the CGST and SGST (or IGST) split, and the final total all update as you type.
How the GST maths works.
GST exclusive
When your price is before tax and GST goes on top.
GST = (Amount × Rate) ÷ 100
Total = Amount + GST
Example: ₹10,000 at 18% GST = ₹1,800 tax (CGST ₹900 + SGST ₹900). Total payable ₹11,800.
GST inclusive
When your amount already includes tax, like an MRP.
Base = Amount ÷ (1 + Rate ÷ 100)
GST = Amount - Base
Example: ₹1,180 that includes 18% GST comes to ₹1,000 base and ₹180 GST.
India's GST slabs after the 2025 reform.
The GST 2.0 reform of 22 September 2025 cut the structure down to three main slabs of 5%, 18% and 40%, and removed the old 12% and 28% slabs. The nil category and two special rates stayed.
| Rate | Slab | Typically applies to |
|---|---|---|
| 0% | Nil / Exempt | Unpackaged food grains, fresh produce and milk, plus most healthcare and education services. |
| 5% | Merit rate | Everyday essentials like packaged staples, life-saving medicines, electric vehicles and renewable-energy equipment. |
| 18% | Standard rate | Most goods and services, including electronics, IT and professional services, small cars, cement and capital goods. |
| 40% | Luxury & sin | Luxury and sin goods such as tobacco and pan masala, aerated and sugary drinks, high-end cars and bikes, yachts, betting and online gaming. |
| 3% | Special rate | Gold, silver, platinum and finished jewellery. |
| 0.25% | Special rate | Rough and polished diamonds and other precious stones. |
Examples are for guidance only. The exact rate for any item is set by its HSN (goods) or SAC (services) code, so check the CBIC rate finder or ask your accountant.
CGST, SGST, IGST & UTGST.
The total tax is always the same. What changes is who collects it. A sale within a state splits into CGST and SGST, while a sale across states is charged as a single IGST.
Central GST
The Central Government's share of GST on a sale made within one state. It works out to half the total rate.
State GST
The State Government's share on that same in-state sale. It sits next to CGST at the other half of the rate.
Integrated GST
Charged by the Centre on sales between states and on imports, at the full rate. The Centre then shares it with the states.
Union Territory GST
Stands in for SGST when the sale happens inside a Union Territory that has no legislature of its own.
Software that handles GST for you.
This tool is handy for a one-off number. But if you invoice every day, you want the right rate applied to every line on its own, tax that reconciles cleanly, and GST returns that don't turn into a scramble. That's the kind of ERP, billing and CRM software we build at Techliphant, shaped around how your business actually works.
Running sales too? See Tilarq CRM.
Common GST questions.
It's a free online tool that works out the Goods and Services Tax on any amount. You enter a value, choose the rate, and it shows the tax, the CGST/SGST or IGST split, and the total. It works both ways, so you can add GST to a base price or pull it out of a GST-inclusive amount.
To add GST, multiply the base amount by the rate and divide by 100: GST = (Amount × Rate) ÷ 100. Then add that to the base for the total. For example, ₹10,000 at 18% is ₹1,800 in tax, so you pay ₹11,800.
Divide the inclusive amount by (1 + rate ÷ 100) to get the base, and the GST is whatever is left over. So ₹1,180 that already includes 18% GST breaks down to ₹1,000 base and ₹180 GST. Set the calculator to 'Inclusive' and it does this for you.
Since the GST 2.0 reform on 22 September 2025 there are three main slabs: 5% for essentials, 18% as the standard rate, and 40% for luxury and sin goods. The old 12% and 28% slabs were scrapped. A 0% category covers exempt items, and the special rates of 3% (gold, silver and jewellery) and 0.25% (rough diamonds) stayed in place.
On a sale inside one state, the GST is split in two: CGST goes to the Centre and SGST goes to the state. On a sale between states, or on an import, a single IGST is charged instead. The total tax is the same either way, so only the split changes.
When the seller and the buyer's location are in the same state, you charge CGST + SGST, each at half the rate. When they are in different states, or the goods are imported, you charge IGST at the full rate. In a Union Territory without its own legislature, UTGST takes the place of SGST.
A GST-exclusive price is the amount before tax, so GST gets added on top. A GST-inclusive price already has the tax baked in, so you work backwards to find the base. MRP is always GST-inclusive, which is why you set the calculator to 'Inclusive' to see the tax sitting inside it.
It depends on the item's HSN code for goods, or SAC code for services. As a rough guide, most things sit at 18%, essentials at 5%, and luxury or sin items at 40%. Check the exact rate for your HSN/SAC on the CBIC rate finder, or with your accountant, before you raise an invoice.
Yes on both. It's free, there's no sign-up, and it runs entirely in your browser. Nothing you type gets sent anywhere or saved, so your numbers stay on your own device.
It's meant for quick estimates: checking a quote, sanity-checking a bill, or working out tax before you invoice. For proper tax invoices at any real volume you'll want billing, ERP or accounting software that applies the rates and files returns for you. That's the kind of software we build at Techliphant if you ever need it.
HSN (Harmonised System of Nomenclature) codes classify goods, and SAC (Services Accounting Code) codes classify services. The code decides which GST rate applies, and it has to appear on your tax invoices once your turnover crosses the notified limits.
GST applies to the transaction value, which is the price actually paid or payable. That usually takes in charges like packing or freight, but not the GST itself. Any discount shown on the invoice is taken off before GST is worked out.
Disclaimer: This GST calculator is provided free for general estimation and educational use. GST rates and rules change and depend on the correct HSN/SAC classification and place of supply. Nothing here is tax, legal or accounting advice. Verify figures with the official CBIC resources or a qualified professional before relying on them for invoices, filings or contracts.
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