GST calculator

GST formulas

To add GST: GST = price × rate ÷ 100. Then total = price + GST.

To remove GST: GST = inclusive price × rate ÷ (100 + rate). Then price before GST = inclusive price − GST.

Worked examples

1. A service costs ₹2,500 before GST at 18%. GST is 2,500 × 18 ÷ 100 = ₹450, so you bill ₹2,950. Within the same state that's ₹225 CGST and ₹225 SGST.
2. A product sells for ₹1,050 including 5% GST. GST is 1,050 × 5 ÷ 105 = ₹50, so the price before GST is ₹1,000.
3. You quote ₹10,000 plus 18% GST to a client in another state. You charge ₹1,800 IGST, for a total of ₹11,800.

CGST, SGST and IGST

When you sell within your own state, GST is split equally: half is CGST, which goes to the central government, and half is SGST, which goes to the state. Union territories without a legislature use UTGST instead of SGST. When you sell to another state, the whole amount is IGST. The customer pays the same total either way.

Turn it into an invoice

Once you know the numbers, the GST invoice generator makes a proper tax invoice with GSTINs, HSN/SAC codes and the right tax split, ready to download as a PDF.

Questions