How to use the GST Calculator India
- Choose Add GST for a pre-tax amount, or Remove GST for a GST-inclusive price.
- Enter the amount.
- Pick the GST rate for your goods or service.
- Choose intra-state or inter-state to see CGST/SGST or IGST.
Formula used
Intra-state: CGST = SGST = GST ÷ 2. Inter-state: IGST = full GST.
Worked examples
| Amount | Rate | GST | Total | Split (intra-state) |
|---|---|---|---|---|
| ₹1,000 | 18% | ₹180 | ₹1,180 | ₹90 CGST + ₹90 SGST |
| ₹1,180 incl. | 18% | ₹180 | ₹1,000 base | ₹90 + ₹90 |
| ₹500 | 5% | ₹25 | ₹525 | ₹12.50 + ₹12.50 |
| ₹50,000 | 3% (gold) | ₹1,500 | ₹51,500 | ₹750 + ₹750 |
Frequently asked questions
What are the GST rates in India in 2026?
The main slabs are 0%, 5% and 18%, with a 40% rate on select luxury and sin goods. Special rates such as 3% on gold and 0.25% on rough diamonds also apply.
What happened to the 12% and 28% slabs?
GST 2.0, effective 22 September 2025, removed them for most items. Most 12% items moved to 5% and most 28% items moved to 18%.
How do I calculate GST from an inclusive price?
Base = Total × 100 ÷ (100 + rate). For ₹1,180 at 18%, base is ₹1,000 and GST is ₹180.
What is the difference between CGST, SGST and IGST?
For sales within a state, GST is split equally between the centre (CGST) and the state (SGST). For sales between states, the full amount is IGST.
Do I need GST registration?
Generally if turnover exceeds ₹40 lakh for goods or ₹20 lakh for services (lower in some states). Check the GST portal for your case.
Sources and references
Our team builds and tests every tool by hand, checks each formula against official sources (IRS, HMRC, the Income Tax Department of India, CBSE, NHS, WHO) and reviews pages whenever rules change. Last reviewed on . Spotted a mistake? Tell us.