GST Calculator.
Add GST to a base price, or pull the GST out of a tax-inclusive amount. Works for any rate and splits the tax into CGST + SGST for a local sale or IGST for an inter-state one.
Since the Sept 2025 rate reform most goods and services sit at 5% or 18%; 40% applies to a short list of luxury and “sin” items, 3% to gold and 0.25% to rough diamonds. Check a specific item in the Rate Finder.
Intra-state = buyer and seller in the same state/UT. Inter-state = different states, or an import/export.
Base amount (excl. GST)
₹
₹
CGST ₹ + SGST/UTGST ₹
Charged as IGST ₹
Total amount (incl. GST)
₹
How it works
- Add GST: GST = amount × rate ÷ 100. Total = amount + GST.
- Remove GST: base = amount × 100 ÷ (100 + rate). GST = amount − base.
- Intra-state splits the GST in half: CGST and SGST (or UTGST in a union territory) at half the rate each.
- Inter-state is charged as a single IGST at the full rate.
This is a straight arithmetic calculation and does not account for cess, MRP-inclusive pricing rules, composition-scheme rates, TCS, or rounding conventions on a tax invoice. Confirm the rate for your exact good or service on the GST portal.