GST Calculator
GST slab guide
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GST rates in India — quick reference
| Rate | Common items |
|---|---|
| 0% | Unbranded food grains, fresh produce, books, education, healthcare |
| 0.25% | Rough precious stones, semiprecious stones |
| 3% | Gold, silver, jewellery |
| 5% | Branded food, footwear up to ₹1000, medicines, economy flights |
| 12% | Processed food, computers, mobile phones, business class flights |
| 18% | Most goods & services, AC restaurants, IT services, hair oil, soaps |
| 28% | Luxury cars, bikes, tobacco, aerated drinks, 5-star hotels |
How to calculate GST on an invoice
For a GST-exclusive base of ₹10,000 at 18%: GST = 10,000 × 0.18 = ₹1,800, invoice total = ₹11,800. On an intra-State sale this prints as CGST ₹900 + SGST ₹900; on an inter-State sale as IGST ₹1,800. Small businesses on the composition scheme instead apply 1% (traders/manufacturers) or 5% (restaurants) on turnover — the calculator above covers both forward and reverse directions.
GST-inclusive vs GST-exclusive price
A GST-exclusive price excludes tax (you add GST on top: base × 1.18). A GST-inclusive price already contains it (MRP tags on shop shelves are inclusive). To extract GST from an inclusive price — the reverse GST calculation — divide by (1 + rate): base = 11,800 ÷ 1.18 = ₹10,000, tax component ₹1,800. Flip the toggle above to 'Remove GST' to do this instantly for any MRP.
How this calculator works
The tool applies the standard GST arithmetic used on Indian invoices — forward (add GST) and reverse (extract GST) — and splits intra-State tax into CGST/SGST halves. Rates follow the GST Council slabs in force for 2026. All maths runs in your browser; nothing is stored. For a fuller walkthrough see GST Calculator Guide: how to calculate GST in India.
Frequently asked questions
What is GST?
Goods and Services Tax — India's unified indirect tax on the supply of goods and services, replacing VAT, service tax, excise and many others since 1 July 2017.
How do I calculate GST on an invoice?
Multiply the taxable value by the GST rate and add it to the base: for ₹10,000 at 18%, GST is ₹1,800 and the invoice total is ₹11,800. Intra-State, show it as CGST ₹900 + SGST ₹900; inter-State, as IGST ₹1,800.
How do I add GST to a price?
Total = Base × (1 + GST%/100). For ₹10,000 at 18%: Total = 10000 × 1.18 = ₹11,800. GST amount = ₹1,800.
What is the reverse GST calculation formula?
Base price = Inclusive total ÷ (1 + GST%/100). For ₹11,800 at 18%: base = 11,800 ÷ 1.18 = ₹10,000, so the tax inside the price is ₹1,800.
What is CGST and SGST?
For sales within a state, GST splits equally into Central GST (CGST) and State GST (SGST). Both 50% of the total. For inter-state sales, IGST (Integrated GST) applies instead.
Who needs to register for GST?
Businesses with annual turnover above ₹40 lakh (goods) or ₹20 lakh (services) must register. Special category states and some services have lower thresholds. Voluntary registration is also allowed.