Free tool
GST calculator.
Enter an amount, pick the rate and see the tax and total — inclusive or exclusive, same state or inter-state. The formula is shown so you can check it by hand.
GST rate
How this is calculated
GST = 1,000 × 18 ÷ 100 = ₹180.00; total = ₹1,180.00
CGST 9% = ₹90.00, SGST 9% = ₹90.00
How the maths works
Exclusive: tax = amount × rate ÷ 100. Inclusive: taxable value = amount × 100 ÷ (100 + rate), tax = amount − taxable value. Within a state the tax splits equally into CGST and SGST; across states it is IGST at the full rate.
Worked example at 18%: ₹1,000 before tax → GST ₹180 → total ₹1,180. ₹1,180 inclusive → taxable value ₹1,000 → GST ₹180.
Which GST rates apply in 2026?
| Rate | In force | Typical items |
|---|---|---|
| 0% | Yes | Essentials: unbranded staples, fresh produce, milk, many education and health services |
| 5% | Yes | Packaged foods, many household goods and most items formerly at 12% |
| 18% | Yes | Most services, electronics and most items formerly at 28% |
| 40% | Yes | Tobacco, pan masala, aerated drinks, luxury vehicles |
| 12% and 28% | Before 22 Sep 2025 | Kept in the calculator for older invoices, credit notes and corrections |
Rates checked 16 Sep 2026 against CBIC notifications. Always confirm the rate for your HSN/SAC.
Read the full guide
For place of supply rules, discounts, MRP reverse calculation and more worked examples, read our guide on how to calculate GST.
Frequently asked questions
How do I calculate GST on an amount?+
Multiply the amount by the rate and divide by 100. ₹2,500 at 18% → ₹450 GST → ₹2,950 total.
How do I remove GST from an inclusive price?+
Divide by (100 + rate) and multiply by 100. ₹2,950 at 18% → ₹2,500 taxable value; the GST is ₹450.
When is it CGST + SGST and when IGST?+
Same state as the buyer: CGST and SGST, half each. Different state (or SEZ/export): IGST at the full rate.
Which rate applies to my product?+
Rates depend on the HSN/SAC classification. Check the GST rate finder on cbic-gst.gov.in or your supplier's invoice.
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