Calculators
GST Calculator
Enter an amount and a GST rate to add GST to it or take GST out of it. See the CGST and SGST split for a sale within a state, or IGST between states.
Amounts are prices before GST. Same state: GST splits into CGST + SGST (UTGST in a union territory).
GST @ 18%
₹180.00
Price including GST
₹1,180.00
| Taxable value | ₹1,000.00 |
|---|---|
| CGST @ 9% | ₹90.00 |
| SGST / UTGST @ 9% | ₹90.00 |
| Total GST | ₹180.00 |
| Total (incl. GST) | ₹1,180.00 |
Add GST: GST = amount × rate ÷ 100. Remove GST: price before GST = amount × 100 ÷ (100 + rate). Figures are rounded to paise; CGST is half the GST and SGST takes the remaining paisa so the two always add up.
Slabs checked 24 September 2026: 5%, 18% and 40% from 22 Sep 2025 (56th GST Council meeting), with most tobacco products moved to 40% from 1 Feb 2026. The 12% and 28% slabs are listed only for older invoices. Which rate applies to your goods or service depends on its HSN/SAC classification — this tool does not decide that.
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Frequently asked questions
How do I add GST to a price?
Multiply the price by the rate and divide by 100, then add it on. At 18%, GST on ₹1,000 is ₹180 and the price including GST is ₹1,180. Within a state, that ₹180 splits into ₹90 CGST and ₹90 SGST.
How do I remove GST from an inclusive price?
Divide the inclusive price by (100 + rate) and multiply by 100. For ₹1,180 at 18%: 1,180 × 100 ÷ 118 = ₹1,000 before GST, so the GST is ₹180. Taking 18% off ₹1,180 directly (₹212.40) is a common mistake and gives the wrong answer.
What are the current GST rates?
Since 22 September 2025 the main GST slabs are 5% (merit rate) and 18% (standard rate), with a special 40% rate for a small set of goods and services, as recommended at the 56th GST Council meeting. Pan masala, cigarettes and most tobacco products moved to 40% (bidi to 18%) from 1 February 2026. Many essentials are nil-rated, and a few goods have special rates, such as 3% on gold. We last checked this on 24 September 2026.
When do I charge CGST + SGST and when IGST?
When the supplier and the place of supply are in the same state, the GST is split equally into CGST (central) and SGST (state), or UTGST in a union territory without a legislature. For supplies between states and for imports, the whole amount is IGST. At 18%, that is 9% + 9% within a state, or 18% IGST between states.
Which GST rate applies to my product or service?
That depends on its HSN code (goods) or SAC code (services) in the official rate notifications, and sometimes on conditions such as packaging or price. This calculator does not classify items. Check the CBIC rate notifications or ask a tax professional if you are unsure.
How are paise rounded?
Each figure is rounded to the nearest paisa. CGST is half the GST rounded to paise, and SGST is the rest, so the two always add up to the total GST even when the GST is an odd number of paise.
About this tool
This GST calculator does the two sums people need most often: adding GST to a price before tax, and working out the tax inside a price that already includes GST. Pick a rate, enter the amount and it shows the GST, the price with or without it and a breakdown into CGST and SGST for a sale within a state, or IGST for a sale between states. Add more lines to build an invoice-style summary grouped by rate. Amounts are shown in the Indian format by default, with an international option.
The formulas are simple and exact. Adding GST: GST = amount × rate ÷ 100. Removing GST: price before GST = inclusive amount × 100 ÷ (100 + rate), and the GST is the difference. Within a state, CGST and SGST are each half the rate, so 18% becomes 9% + 9%, and 5% becomes 2.5% + 2.5%. Every figure is rounded to paise, with CGST and SGST split so they always add up to the GST.
The rate presets follow the structure in force since 22 September 2025, verified on 24 September 2026 against the Press Information Bureau release on the 56th GST Council meeting (3 September 2025), which set a 5% merit rate, an 18% standard rate and a 40% special rate, and against the GST Council’s December 2025 newsletter, which records pan masala and most tobacco products moving to 40% from 1 February 2026. The old 12% and 28% slabs are kept as options for checking invoices dated before the change.
The calculator does arithmetic only. It does not decide which rate applies to an item, whether an item is exempt, or whether input tax credit is available; those depend on HSN/SAC classification and the official notifications. Nothing you enter leaves your browser.