GST Calculator India: Inclusive, Exclusive & Reverse GST Tool | Calcuary
GST Calculator India
Inclusive, Exclusive & Reverse Tax Calculation
Calculate GST inclusive & exclusive amounts for all slabs (0%, 5%, 12%, 18%, 28%), CGST/SGST/IGST split, and reverse GST extraction from any total with rate comparison.
GST Calculator
Amount • Rate • CGST/SGST/IGST
Enter your amount and GST rate, or choose a preset
and click Calculate GST
💰 GST Tax Component Split
📈 GST Rate Comparison (Same Base Amount)
🧮 Explore More Financial Calculators
What is a GST Calculator?
A GST Calculator is a free online tool that helps businesses, traders, and consumers calculate the Goods and Services Tax applicable to any transaction in India. It handles both GST Exclusive (adding GST on top of the base price) and GST Inclusive (extracting/reverse-calculating GST from a total), plus shows the CGST/SGST/IGST split.
GST was launched on 1st July 2017 as India's unified indirect tax, replacing multiple older taxes like VAT, Service Tax, Excise, and CST. It is applied based on the location of supplier and recipient (intra-state or inter-state) and the type of goods or services.
GST Slabs in India (2025-2026)
| GST Slab | Common Items | CGST | SGST | IGST |
|---|---|---|---|---|
| 0% | Fresh fruits, vegetables, milk, grains | 0% | 0% | 0% |
| 5% | Packaged food, tea, coffee, economy flights | 2.5% | 2.5% | 5% |
| 12% | Butter, ghee, mobile phones, business class airfare | 6% | 6% | 12% |
| 18% | Most goods & services: electronics, restaurants, IT services | 9% | 9% | 18% |
| 28% | Luxury goods: cars, tobacco, aerated drinks | 14% | 14% | 28% |
GST Calculation Formulas
GST Amount = Base Amount × (GST Rate ÷ 100)
Total (Incl. GST) = Base Amount + GST Amount
GST Inclusive (Reverse Calculation):
Base Amount = Inclusive Total ÷ (1 + GST Rate ÷ 100)
GST Amount = Inclusive Total − Base Amount
CGST & SGST (Intra-State):
CGST = GST Amount ÷ 2 | SGST = GST Amount ÷ 2
IGST (Inter-State):
IGST = Full GST Amount (100%)
How to Use This GST Calculator
Choose Mode
Select Exclusive to add GST, or Inclusive to extract GST from a total.
Enter Amount
Use the slider or type the exact amount manually.
Select GST Rate
Pick from 0%, 5%, 12%, 18%, 28% or enter custom rate.
Choose Transaction Type
Intra-State (CGST+SGST) or Inter-State (IGST).
Real-World GST Example (Illustrative)
Consider a business selling electronics worth ₹1,00,000 to a customer in the same state (intra-state transaction) with a GST slab of 18%:
- Base Amount: ₹1,00,000
- GST @ 18%: ₹18,000
- Split: CGST @ 9% = ₹9,000 | SGST @ 9% = ₹9,000
- Total Invoice Value: ₹1,18,000
If the same transaction were inter-state (say Delhi to Maharashtra), the entire ₹18,000 would be collected as IGST instead of the CGST+SGST split.
Common GST Mistakes to Avoid
- Confusing Inclusive vs Exclusive: Quoting base price and later adding GST changes the total significantly.
- Wrong CGST/SGST Split: Both must be exactly half of the total GST for intra-state transactions.
- Ignoring HSN/SAC Codes: GST rate depends on the correct classification of goods (HSN) or services (SAC).
- Forgetting Input Tax Credit (ITC): Businesses should offset GST paid on purchases against GST collected on sales.
- Non-Compliance with E-Invoicing: Businesses above ₹5 crore turnover must generate e-invoices.