GST Calculator
Add or remove GST instantly. Calculate CGST, SGST, IGST for all rates - 5%, 12%, 18%, 28%. Free GST calculator for Indian businesses.
What is GST Calculator?
A GST calculator helps businesses and individuals calculate the Goods and Services Tax on products and services in India. You can either add GST to find the final selling price, or remove GST (reverse calculation) to find the original price from a GST-inclusive amount.
Our calculator supports all GST rates in India: 5%, 12%, 18%, and 28%, and breaks down the tax into CGST, SGST (for intra-state) or IGST (for inter-state transactions). Explore all our tax calculators including Income Tax, TDS, and Capital Gains.
GST Rates in India (2025)
| GST Rate | Items Covered |
|---|---|
| 0% | Essential items - milk, vegetables, grains, healthcare |
| 5% | Basic necessities - sugar, tea, edible oils, economy hotel stays |
| 12% | Processed foods, computers, mobile phones, standard hotel stays |
| 18% | Most services, electronics, industrial goods, restaurant food |
| 28% | Luxury items - cars, AC, cement, luxury hotels, tobacco |
How to Calculate GST
Adding GST (Exclusive to Inclusive)
GST Amount = Original Price × (GST Rate / 100)
Final Price = Original Price + GST Amount
Example: Product price ₹1,000, GST rate 18%
- GST Amount = 1000 × 18/100 = ₹180
- Final Price = 1000 + 180 = ₹1,180
Removing GST (Inclusive to Exclusive)
Original Price = GST Inclusive Amount × 100 / (100 + GST Rate)
GST Amount = Inclusive Amount - Original Price
Example: Invoice amount ₹1,180, GST rate 18%
- Original Price = 1180 × 100 / 118 = ₹1,000
- GST Amount = 1180 - 1000 = ₹180
CGST, SGST, and IGST Explained
Intra-State Supply (Within Same State)
When seller and buyer are in the same state, GST is split equally between:
- CGST (Central GST) - Goes to Central Government
- SGST (State GST) - Goes to State Government
Example: 18% GST = 9% CGST + 9% SGST
Inter-State Supply (Different States)
When seller and buyer are in different states, full GST is charged as:
- IGST (Integrated GST) - Goes to Central Government, then settled with states
Example: 18% GST = 18% IGST
GST for Common Business Scenarios
E-commerce Sellers
- Platform commission is subject to 18% GST
- Shipping charges attract 18% GST (included in courier fees)
- Product GST varies by category
Restaurants
- Non-AC restaurants: 5% GST (no input credit)
- AC restaurants: 5% GST (no input credit)
- 5-star hotels: 18% GST (with input credit)
Professional Services
- IT services, consulting: 18% GST
- Legal, accounting services: 18% GST
- Healthcare services: Exempt
Input Tax Credit (ITC)
Businesses can claim credit for GST paid on purchases against GST collected on sales. This prevents cascading of taxes (tax on tax).
Net GST Payable = Output GST (on sales) - Input GST (on purchases)
GST Registration Threshold
- ₹40 lakh - For goods suppliers (₹20 lakh for special category states)
- ₹20 lakh - For service providers (₹10 lakh for special category states)
- Mandatory - For inter-state suppliers, e-commerce sellers, casual taxable persons
Frequently Asked Questions
Is GST applicable on exports?
Exports are zero-rated under GST. You can either export without paying IGST (under Bond/LUT) or pay IGST and claim refund later.
How to calculate GST for multiple items?
Calculate GST separately for each item based on its applicable rate, then add them up. Our calculator handles single items; for bulk calculations, use GST billing software.
What is reverse charge mechanism?
Under reverse charge, the buyer pays GST instead of seller. This applies to services from unregistered persons, imports, and specified services like legal, GTA, etc.