GST Calculator India: How to Calculate GST on
Learn how GST works in India, GST rates for different goods and services, how to add or remove GST from a price, and common examples.
GST (Goods and Services Tax) is India's unified indirect tax that replaced the old VAT, service tax, and excise duty system. Whether you are a business owner or consumer, knowing how to calculate GST accurately is essential.
GST Rate Slabs in India (2026)
| GST Rate | Examples |
|---|---|
| 0% | Fresh fruits, vegetables, milk, eggs, salt, books, newspapers |
| 5% | Packaged food, tea, coffee, medicines, railway tickets, economy hotels |
| 12% | Processed food, butter, cheese, smartphones, computers, construction services |
| 18% | Most services (IT, banking, consulting), AC restaurants, electronics, cement |
| 28% | Luxury goods, cars, tobacco, aerated drinks, casinos, online gaming |
Adding GST to a Base Price
Formula: GST Amount = Base Price × GST Rate / 100
Total Price = Base Price + GST Amount
Example: Software service (18% GST) costing ₹10,000.
- GST = ₹10,000 × 18% = ₹1,800
- Total invoice = ₹11,800
Removing GST from an Inclusive Price
If a price already includes GST:
Base Price = Total Price × 100 / (100 + GST Rate)
Example: A product is priced at ₹5,900 inclusive of 18% GST.
- Base price = ₹5,900 × 100 / 118 = ₹5,000
- GST component = ₹900
CGST, SGST, and IGST
- CGST + SGST: For intra-state transactions. Each is half the total GST rate. (18% GST = 9% CGST + 9% SGST)
- IGST: For inter-state transactions. Equal to the full GST rate.
Input Tax Credit (ITC)
Registered businesses can claim Input Tax Credit — the GST paid on purchases can be offset against GST collected on sales. This prevents the cascading effect of multiple taxes.
Example: You buy raw materials for ₹50,000 + ₹9,000 GST (18%), and sell the product for ₹80,000 + ₹14,400 GST. Your net GST payable = ₹14,400 − ₹9,000 = ₹5,400.
When Do You Need to Register for GST?
- Annual turnover above ₹40 lakhs (goods) or ₹20 lakhs (services)
- Any inter-state supply of goods or services
- E-commerce sellers (mandatory regardless of turnover)
Calculate GST instantly with our GST Calculator.