Free GST tool

GST Calculator

Add or remove GST at any Indian slab — 0%, 5%, 12%, 18% or 28% — and see the CGST/SGST or IGST split update instantly.

Controls

Initial Amount

₹

Tax Type

Calculation

GST Rate18%

Total Amount

₹ 1,180.00

GST added to base · 18%

Inter-state · IGST

Breakdown

Net Amount: ₹ 1,000.00
IGST @ 18%: ₹ 180.00
Total Tax: ₹ 180.00
Total Amount: ₹ 1,180.00

GST slabs

0%5%12%18%28%

How GST is calculated

Add GST takes a base (taxable) amount and adds the tax on top. Subtract GST works backwards from a tax-inclusive total to recover the taxable value as amount × 100 ÷ (100 + rate).

For an intra-state sale the tax splits equally into CGST and SGST (each half the rate). For an inter-state sale the full rate is charged as a single IGST.

Indian GST slabs

Goods and services fall into five rate buckets — 0%, 5%, 12%, 18% and 28%. Most pharmaceutical formulations sit at 5% or 12%.

For information only — confirm the applicable rate and place of supply for your goods before filing.