GST Calculator — add or remove GST

Enter an amount, pick the rate, and get the taxable value, GST, and total — with the CGST/SGST (intra-state) or IGST (inter-state) split done for you.

GST rate
Amount is
Supply
Taxable value₹10,000.00
CGST @ 9%₹900.00
SGST @ 9%₹900.00
Total (incl. GST)₹11,800.00

Raising GST invoices with the CGST/SGST/IGST split done for you, HSN auto-filled, and pushed straight into GSTR-1? Try OnGravy →

Frequently asked

How is GST calculated?

To add GST, multiply the taxable amount by the rate (e.g. ₹10,000 × 18% = ₹1,800 GST, ₹11,800 total). To remove GST from an inclusive price, divide by (1 + rate): ₹11,800 ÷ 1.18 = ₹10,000 taxable. This calculator does both.

When is it CGST + SGST vs IGST?

For an intra-state supply (buyer and seller in the same state), GST splits equally into CGST and SGST — e.g. 18% becomes 9% CGST + 9% SGST. For an inter-state supply, the full rate is charged as IGST. The place of supply decides which applies.

What are the GST rates in India?

The main slabs are 5%, 12%, 18% and 28%, plus 0% (nil-rated/exempt), 0.25% (rough diamonds) and 3% (gold). The rate depends on the HSN/SAC of the goods or service.

Raise real GST invoices in seconds

OnGravy computes the split, auto-fills HSN, and files it straight into your GSTR-1.

Try OnGravy →