GST Calculator (India)
Add or remove GST from any amount, with CGST + SGST split for intra-state and IGST for inter-state supplies. Supports all Indian GST slabs.
Price before GST is added.
GST amount
₹180
Gross price
₹1,180
Total with GST
Total to pay
₹1,180
CGST + SGST split
CGST: ₹90 (half) · SGST: ₹90 (half) — same state supply. GST rates are as notified by GST Council; verify current rates for your HSN/SAC code.
How it works
GST = net × (rate ÷ 100). Intra-state: CGST = SGST = GST ÷ 2. Gross to net: net = gross ÷ (1 + rate ÷ 100).
Example: ₹1,000 at 18% → GST ₹180, total ₹1,180 (CGST ₹90 + SGST ₹90).
Last updated: September 2026
How this calculator is verified
Checked by Rahim Virani on
- Intra-state CGST+SGST split verified to sum exactly to the total GST
- Inter-state IGST applied as a single line, not split
- Inclusive and exclusive tax modes both verified to round-trip
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Use the GST calculator whenever you need the tax amount on any Indian transaction — adding GST to a quoted price, or splitting a bill that already includes it. Business owners preparing quotations, freelancers invoicing clients, and shopkeepers pricing goods all need both directions: the GST-exclusive price with tax added, and the taxable value hidden inside a GST-inclusive bill, which is what expense claims and input tax credit require. Choose the slab — 5%, 12%, 18% or 28% — and the tool shows the tax amount plus the CGST and SGST split for intra-state supplies, or the IGST figure for inter-state and imports. A seller dealing in multiple categories can check all slabs in one place instead of remembering which rate applies to which product.
How to Use This Calculator
- Step 1: Enter the taxable amount, which is the price before tax.
- Step 2: Select the GST slab that applies, such as 18% for restaurants or 5% for packaged food items.
- Step 3: Choose add-GST for a price that is not yet taxed, or remove-GST for a price that already includes tax.
- Step 4: Read the GST amount and the CGST plus SGST split for intra-state supplies, or the single IGST figure for inter-state supplies.
Worked Example
A restaurant in Jaipur bills a customer ₹2,000 before tax. Select the add-GST mode and the 18% slab; GST is 18% of 2,000, which is ₹360, so the invoice total becomes ₹2,360. Because the supply is intra-state, the tax splits equally into CGST of ₹180 and SGST of ₹180. For an inter-state sale of the same amount, the tool shows IGST of ₹360 instead. The reverse mode works backwards: from a ₹1,180 inclusive price at 18%, it recovers ₹1,000 as the taxable value and ₹180 as GST.
Tips and Common Mistakes
- •Tip 1: Intra-state sales split tax into equal CGST and SGST halves, while inter-state sales carry the full amount as IGST.
- •Tip 2: For an inclusive bill, always use remove-GST rather than subtracting 18% from the total, because the true tax base is the pre-tax price.
- •Tip 3: Input tax credit means a registered business only pays the net GST, so the invoice GST shown is not the final cost to a business.
- ✗Mistake 1: Using remove-GST on an amount that is not yet taxed, which understates the actual GST payable.
- ✗Mistake 2: Applying the add-GST result to a bill that already shows a GST-inclusive total, which charges the tax twice.
GST Slabs and What They Apply To
| Item | Value |
|---|---|
| 0% | Unpackaged basic food items, fresh produce, books, loose maize |
| 5% | Packaged food, transport by rail, economy class air travel, small restaurants |
| 12% and 18% | Most goods and services, including restaurant food and construction materials |
| 28% | Luxury cars, tobacco, aerated drinks, cement (under construction slabs) |
| 28% plus cess | Sin products and luxury goods, on top of the 28% base |
What this figure assumes
This assumes you know which slab applies to your supply. GST is charged on the value of supply at the rate of the category, not a single flat rate, so a 5% packaged-food bill and an 18% restaurant bill use the same formula but different rates. The result excludes input tax credit, which can only be claimed by a registered business.
Rates and rules checked as of September 2026. These change with government notification — confirm against the linked source before you rely on the result.
Sources and References
- •Central Goods and Services Tax Act, 2017 (CGST / SGST / IGST slabs and rates)
- •GST Council rate schedule: 0%, 5%, 12%, 18% and 28% plus cess
- •Goods and Services Tax (Rate) notifications issued by the GST Council
Official sources are linked so you can confirm the current rate yourself. Check the linked page for the latest notification before relying on these figures.
Frequently Asked Questions
How is GST calculated in India?
GST = value × rate. On a ₹1,000 item at 18%, GST is ₹180 and the total is ₹1,180. For intra-state supplies the tax splits into CGST and SGST (half each); inter-state and imports are charged IGST in full.
What are the GST rates in India?
The main slabs are 0%, 5%, 12%, 18% and 28%. Most goods and services fall under 18%. Essential items like grains and milk are exempt, and the top slab covers luxury goods. Rates are set by the GST Council and can change — always check the current rate for your HSN/SAC code.
How do I remove GST from a price?
To back out GST from a gross amount, divide by (1 + rate/100). For ₹1,180 including 18% GST, the net price is 1180 ÷ 1.18 = ₹1,000. Switch the calculator to 'With GST' mode to do this automatically.
What is the difference between CGST, SGST and IGST?
CGST (Central GST) and SGST (State GST) are two halves of the same tax, both paid for intra-state sales. IGST (Integrated GST) is the full tax paid for inter-state sales or imports, later shared between the Centre and the state.
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