GST Calculator
Add GST to a base price or pull it out of an inclusive amount, with the CGST + SGST or IGST split, at the GST 2.0 rates in force since 22 September 2025.
Your Inputs
Change any value, the result updates instantly.
The maths behind the GST calculator
Two directions, one rate, the only trick is knowing whether your figure already contains GST.
Adding GST (exclusive price)
When you quote a price before tax, GST is charged on top of it:
Worked example: a designer bills ₹10,000 for a logo at 18% GST. GST = 10,000 × 18 ÷ 100 = ₹1,800, so the invoice reads ₹11,800. If the client is in the same state, the tax appears as CGST ₹900 + SGST ₹900; if in another state, as IGST ₹1,800.
Removing GST (inclusive price)
When a figure, an MRP, a till receipt, already includes GST, you cannot just knock the rate off. Divide instead:
Worked example: a bill of ₹11,800 at 18%. Base = 11,800 ÷ 1.18 = ₹10,000 and GST = ₹1,800. Note that 18% of 11,800 would be ₹2,124, the common mistake this mode protects you from.
GST calculator, common questions
It depends on where the supplier and the place of supply are. If both fall in the same state or union territory (an intra-state supply), the tax is collected half as CGST for the Centre and half as SGST/UTGST for the state, 9% + 9% on an 18% supply. If they are in different states (inter-state), the full rate is charged as a single IGST. Either way, the total tax and the price to the customer are identical; only the way it is reported and settled differs.
Switch this calculator to "Remove GST (inclusive)" and enter the MRP. Because the printed price already contains the tax, the base is MRP ÷ (1 + rate/100), not MRP minus rate%. For an MRP of ₹1,180 at 18%, the pre-tax value is ₹1,000 and the embedded GST is ₹180. Sellers use this constantly to price backwards from a target shelf price.
For new supplies made on or after 22 September 2025, almost everything previously at 12% or 28% has been re-fitted into the 5%, 18% or 40% slabs. We keep 12% and 28% available here, clearly marked "legacy", because you may still need them, for checking older invoices, credit notes or debit notes that relate to pre-change supplies, or the few transition cases where the earlier rate continues to apply. If you are unsure which rate governs your product or service, ask a Taxopd CA before invoicing.