GST Calculator Online
Add or remove GST from any amount with the CGST, SGST, and IGST breakdown. Updated for GST 2.0 — the 5%, 18%, and 40% slabs.
GST 2.0 (from 22 Sep 2025) uses 5%, 18% and 40%. For older bills at 12% or 28%, type it in Custom %.
Processing multiple invoices? Batch extract to Excel.
Convert to ExcelHow GST Calculation Works
GST (Goods and Services Tax) is calculated on the taxable value of goods or services. Since the GST 2.0 reform on 22 September 2025, the everyday slabs are 5%, 18%, and 40% (plus 0% for exempt supplies). The earlier 12% and 28% slabs were removed — most 12% items moved to 5%, most 28% items to 18%, and luxury / sin goods moved to the new 40% slab. Invoices dated on or before 21 September 2025 may still show 12% or 28%, and remain valid — use the Custom % field for those. See GST 2.0 on your invoice for the full cutover story.
Adding GST (Exclusive Calculation)
When you have the base price and need to find the GST-inclusive total:
Example: Item price = Rs. 10,000, GST rate = 18%
GST amount = 10,000 × 18% = Rs. 1,800
Total = 10,000 + 1,800 = Rs. 11,800
If intra-state: CGST = Rs. 900 (9%) + SGST = Rs. 900 (9%)
If inter-state: IGST = Rs. 1,800 (18%)
Removing GST (Reverse Calculation)
When you have the total amount and need to find the original price before GST:
Example: Total amount = Rs. 11,800, GST rate = 18%
Original amount = 11,800 ÷ 1.18 = Rs. 10,000
GST amount = 11,800 - 10,000 = Rs. 1,800
Formula: Original amount = Total ÷ (1 + GST rate/100)
GST Slab Rates in India (GST 2.0, from 22 Sep 2025)
| Rate | Applies To | Examples |
|---|---|---|
| 0% | Essential / exempt goods | Fresh vegetables, milk, grains, salt, books |
| 5% | Merit rate — essentials & most FMCG | Packaged food, hair oil, soap, toothpaste, footwear, kitchenware |
| 18% | Standard rate — most goods & services | Electronics, restaurants, IT services, financial services |
| 40% | Special rate — luxury & sin goods | Tobacco, pan masala, aerated drinks, luxury cars & SUVs, motorcycles >350cc |
Removed in GST 2.0: the 12% and 28% slabs. They still appear on invoices dated on or before 21 September 2025, which remain valid — enter those rates in the Custom % field to reverse-calculate old bills.
The 40% Slab and Compensation Cess
Under GST 2.0, most goods that used to carry 28% GST plus a compensation cess — luxury cars, SUVs, aerated drinks — were folded into the single 40% slab, so for those you no longer add a separate cess.
Example: SUV priced at Rs. 10,00,000 at the 40% slab
GST = 10,00,000 × 40% = Rs. 4,00,000
Total = 10,00,000 + 4,00,000 = Rs. 14,00,000
A compensation cess still applies to a narrow residual set during the transition (notably tobacco and pan masala, where cess continued). If your product carries one, enter it in the optional Compensation Cess field above and confirm the current rate from the CBIC notification for that HSN code.
CGST vs SGST vs IGST
The type of GST charged depends on whether the transaction is within a state or across states:
- Intra-state (buyer and seller in same state): GST rate splits equally into CGST (Central) + SGST (State). E.g., 18% = 9% CGST + 9% SGST.
- Inter-state (buyer and seller in different states): Full rate charged as IGST (Integrated). E.g., 18% IGST.
The total tax amount is the same either way — only the split changes. This matters for return filing and input tax credit claims.
Related Tools & Guides
- GST 2.0 on Your Invoice — the 22 Sep 2025 cutover, which slab moved where, and how to read old vs new rates
- HSN Code Lookup — find the current GST 2.0 rate for any product by HSN code
- Verify GST Number — validate any GSTIN's format and check digit
- GST State Code List — find state codes for intra/inter-state determination
- GST Number Search — look up business details from a GSTIN
- GST Invoice Generator — put the calculated GST onto a downloadable invoice
Processing GST Invoices?
Upload your GST invoice PDF and get all fields — GSTIN, amounts, taxes — extracted into Excel automatically.
Convert to ExcelFrequently Asked Questions
How do I calculate GST on an amount?
Multiply the amount by the GST rate. For example, 18% GST on Rs. 10,000 = Rs. 1,800. Total = Rs. 11,800. For intra-state, this splits into 9% CGST + 9% SGST.
How do I remove GST from a total amount?
Divide the GST-inclusive amount by (1 + GST rate). For 18% GST: divide by 1.18. So Rs. 11,800 ÷ 1.18 = Rs. 10,000 (original amount).
What are the GST slab rates in India?
Since GST 2.0 (22 Sep 2025): 0% (exempt), 5% (essentials & most FMCG), 18% (most goods/services), and 40% (luxury/sin goods). The 12% and 28% slabs were removed — old invoices may still show them and stay valid.
What is the difference between CGST, SGST, and IGST?
Intra-state supply (same state) = CGST + SGST (rate split equally). Inter-state supply (different states) = IGST (full rate). The total tax is the same — only the split differs.
What is compensation cess in GST?
An additional levy on demerit/luxury goods on top of GST. Under GST 2.0, most 28%+cess items (luxury cars, SUVs, aerated drinks) moved into the single 40% slab, so no separate cess applies to them. A residual cess still applies to a narrow set during the transition (notably tobacco and pan masala). Use the optional Compensation Cess field above where it applies.
Is this calculator free?
Yes, completely free with no signup. Calculations happen in your browser — no data is sent to any server.