GST Calculator
Add or remove GST at any rate and see the CGST, SGST and IGST split instantly. Free, no sign-up.
GST Calculator
Free · nothing is savedGST rate
Base amount
₹10,000
GST (18%)
₹1,800
Total
₹11,800
CGST ₹900 + SGST ₹900 within a state · IGST ₹1,800 across states
How the GST calculator works
Adding GST to a price: GST = amount × rate ÷ 100, and the total is the amount plus GST. For ₹10,000 at 18%, GST is ₹1,800 and the total is ₹11,800.
Removing GST from a GST-inclusive price: taxable value = total ÷ (1 + rate ÷ 100). For ₹11,800 at 18%, the taxable value is ₹10,000 and the GST inside it is ₹1,800.
CGST, SGST and IGST
| Supply | Tax charged | Example on ₹1,800 GST |
|---|---|---|
| Within the same state | CGST + SGST, half each | ₹900 CGST + ₹900 SGST |
| To another state | IGST, the full amount | ₹1,800 IGST |
| Within a union territory | CGST + UTGST | ₹900 + ₹900 |
GST rates in 2026
Since 22 September 2025, most goods and services fall into two main slabs:
| Rate | What it covers |
|---|---|
| 0% | Essentials such as fresh food, milk, health and life insurance |
| 5% | Everyday goods, packaged food, many services |
| 18% | The standard rate for most goods and services |
| 40% | Luxury and sin goods such as tobacco, aerated drinks and large cars |
| 3% / 0.25% | Gold, silver and jewellery / rough diamonds |
Always check the rate for your exact HSN or SAC code before invoicing.
Questions, answered
How do I calculate GST from a total amount?
Divide the total by (1 + rate/100) to get the taxable value, then subtract it from the total. For ₹1,180 at 18%: 1,180 ÷ 1.18 = ₹1,000 taxable value and ₹180 GST. Use “Remove GST” in the calculator to do it instantly.
Are the 12% and 28% GST slabs still used?
From 22 September 2025, most items in the 12% slab moved to 5% and most in the 28% slab moved to 18%. Luxury and sin goods moved to a new 40% rate. A few special rates, like 3% on gold, continue.
When is IGST charged instead of CGST and SGST?
IGST applies when the supplier and the place of supply are in different states — for example, a seller in Delhi shipping to a buyer in Mumbai. Within one state, the tax is split equally into CGST and SGST.
Do I need GST registration to charge GST?
Yes. Only registered businesses can charge GST on invoices. Check whether you need registration with our free GST eligibility checker.
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