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GST Calculator

Split any invoice into CGST, SGST & IGST

Free No signup GST ready
What this calculator does

Calculate the GST amount on an invoice and see the correct CGST/SGST or IGST split.

Amount entered is
GST rate
Supply type
CGST + SGST/UTGST, split equally

Good to know

  • Since 22 Sep 2025 most goods and services fall under 5% or 18%; the old 12% and 28% slabs were removed.
  • 40% applies to a short list of luxury and sin goods (for example tobacco, pan masala and certain high-end cars) — check the notification for your item.
  • 0.25%, 1.5% and 3% are special rates for rough diamonds, cut and polished diamonds, and gold/silver.
  • Pick "Including GST" if the amount already contains tax and you need the taxable value back-calculated.

Results

Total invoice value

₹11,800.00

Taxable value: ₹10,000.00

Taxable value₹10,000.00
Total GST (18%)₹1,800.00
CGST (9%)₹900.00
SGST / UTGST (9%)₹900.00

Estimate only. Confirm the applicable HSN/SAC code and GST rate for your specific goods or services in the latest notification before issuing an invoice.

How it works

How this tool works

Enter an invoice amount and GST rate to see the taxable value, total GST, and the correct split between CGST/SGST (intra-state) or IGST (inter-state) supply.

GST Calculator formula

GST exclusive: GST = Amount × Rate ÷ 100. GST inclusive: GST = Amount × Rate ÷ (100 + Rate). Within a state the GST is split equally into CGST and SGST; between states it is charged as IGST.

Worked example

A Pune business sells goods worth ₹10,000 at 18% GST.

  1. GST = ₹10,000 × 18 ÷ 100 = ₹1,800
  2. Sale within Maharashtra: CGST ₹900 + SGST ₹900
  3. Sale to Gujarat: IGST ₹1,800
  4. Invoice total = ₹11,800. Working back from ₹11,800 inclusive: GST = ₹11,800 × 18 ÷ 118 = ₹1,800

The invoice total is ₹11,800, with ₹1,800 GST shown as CGST + SGST or IGST depending on the buyer's state.

Questions

GST Calculator: FAQs

CGST and SGST apply to sales within the same state, split equally between the central and state governments. IGST applies to interstate sales and goes entirely to the center, later apportioned to the destination state.

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