GST calculator

Add GST to a price, or work out the GST included in an amount, with the CGST and SGST split.

Main slabs since 22 Sept 2025: 5%, 18% and 40%. 12% and 28% apply to earlier invoices.

Total amount (incl. GST)

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  • Amount before GST —
  • CGST (%) —
  • SGST (%) —
  • Total GST —

How to use the GST Calculator tool

3 simple steps · under a minute

  1. 1

    Enter the amount

    Type the price before GST, or the total that already includes GST.

  2. 2

    Pick the GST rate

    Choose a common rate such as 5% or 18%, or type your own.

  3. 3

    Add or remove GST

    See the net price, the GST amount, the CGST and SGST split and the total.

About GST calculator

Goods and Services Tax (GST) is charged on most goods and services in India. This calculator adds GST to a price, or removes it from an amount that already includes GST, and shows how the tax is split.

For a sale within the same state, GST is split equally into Central GST (CGST) and State GST (SGST). For a sale from one state to another, the whole amount is charged as Integrated GST (IGST). Since 22 September 2025 most items fall under the 5% or 18% slabs, with 40% for a small list of luxury and sin goods; the older 12% and 28% slabs still apply to invoices raised before that date.

Add or remove GST

Works both ways: from a price before tax, or back from a GST-inclusive total.

CGST, SGST and IGST

Shows the split for sales within a state and the IGST for sales between states.

Any rate

Quick buttons for common slabs, plus any custom rate.

Frequently asked questions

How do I add GST to a price?

GST amount = price × rate ÷ 100, and the total = price + GST. For example, 18% GST on 1,000 is 180, so the total is 1,180.

How do I remove GST from an inclusive amount?

Price before GST = total × 100 ÷ (100 + rate). For example, 1,180 including 18% GST is 1,000 before tax, with 180 of GST.

What are CGST and SGST?

For a sale within one state, GST is split equally between the Centre (CGST) and the State (SGST). At 18%, that is 9% CGST and 9% SGST.

When is IGST charged?

IGST is charged on sales from one state to another, and on imports. It equals the full GST rate.

What are the current GST rates?

From 22 September 2025 the main slabs are 5% and 18%, with 40% for selected luxury and sin goods, and lower special rates such as 3% for gold. Check the official GST rate list for your item.