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GST Calculator

Add GST to a price or remove it from a total. CGST, SGST, and IGST split for every slab.

Runs in your browser. Nothing is uploaded.

Amount
The amount is
$
%
Total including GST
$1,180.00
Before GST
$1,000.00
GST at 18%
$180.00
CGST 9%
$90.00
within a state
SGST 9%
$90.00
within a state
IGST 18%
$180.00
between states

$1,000.00 × 18% = $180.00 GST; total $1,180.00.

Adding GST to a price

GST amount = price × rate ÷ 100, and the total is the price plus that. On ₹1,000 at 18% the tax is ₹180 and the customer pays ₹1,180. Within a state the tax is split equally into CGST and SGST (9% + 9% here); between states it is charged as one IGST at the full rate.

Removing GST from a total

When a price already includes GST, the base amount is total ÷ (1 + rate ÷ 100). ₹1,180 inclusive at 18% is ₹1,000 before tax and ₹180 GST. Dividing by (1 + rate) is the step people get wrong; multiplying the total by 18% would give ₹212, which is too much.

GST rates

India uses 0%, 0.25%, 3%, 5%, 12%, 18% and 28% slabs. Most goods and services fall under 18%; essentials sit at 0–5%, gold and jewellery at 3%, and luxury or sin goods at 28% plus cess. Rates change in council meetings, so check the current schedule for your item.

Input tax credit

Registered businesses can offset GST paid on purchases against GST collected on sales. This calculator gives the tax on a single amount; it does not net off credits.

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