GST Calculator
Select GST Rate
Or enter custom rate
Original Amount (before GST)
Enter amount and tap
Calculate GST
Free Online GST Calculator for India
Our GST calculator handles both adding GST to a base price and removing GST from an inclusive price — in one simple tool. Select from the four official GST slab rates (5%, 12%, 18%, 28%) or enter any custom rate. Instantly get CGST, SGST and IGST breakdowns for intra-state and inter-state transactions.
Whether you are a business owner generating invoices, a consumer checking if GST was correctly charged, a CA verifying tax amounts, or a student learning about indirect taxation — this tool gives you accurate GST calculations in seconds.
GST Slab Rates in India
| GST Rate | Category | Examples |
|---|---|---|
| 0% | Exempt | Fresh food, milk, eggs, salt, education services |
| 5% | Essential goods | Packaged food, transport, economy hotels |
| 12% | Standard goods | Processed food, business class tickets, medicines |
| 18% | Most goods & services | Restaurants, IT services, telecom, electronics |
| 28% | Luxury goods | Cars, tobacco, luxury hotels, aerated drinks |
CGST vs SGST vs IGST — Explained
When you buy something within the same state (intra-state), the GST is split equally between the Central Government (CGST) and the State Government (SGST). On an 18% GST purchase, CGST = 9% and SGST = 9%. When buying across state lines (inter-state), the full GST is collected as IGST (Integrated GST) by the Central Government and later shared with the destination state.
Frequently Asked Questions
How do I calculate GST on a price?
GST amount = (Original price × GST rate) ÷ 100. Total price = Original price + GST amount. Example: ₹1000 with 18% GST → GST = ₹180 → Total = ₹1180.
How do I remove GST from a GST-inclusive price?
Original price = GST-inclusive price ÷ (1 + GST rate ÷ 100). Example: ₹1180 with 18% GST → ₹1180 ÷ 1.18 = ₹1000 original price. Use the "Remove GST" mode above.
What GST rate applies to restaurants?
Most restaurants charge 5% GST without input tax credit. AC restaurants and those in 5-star hotels may charge 18% GST. The rate depends on the restaurant type and location.
Is this GST calculator free?
Yes, 100% free. No account needed. All calculations happen instantly in your browser and no data is stored.