GST Calculator CGST · SGST · IGST Breakdown
Enter an amount and GST rate — get the CGST/SGST split for intrastate or IGST for interstate, with inclusive/exclusive toggle.
inclusive = price already includes gst. intrastate = cgst + sgst; interstate = igst at full rate.
How to Use This Calculator
enter the transaction details and the calculator instantly shows the gst breakdown — no manual effort required.
- step 1 — enter the amount (the price of the goods or service).
- step 2 — select the applicable gst rate from the dropdown (0.1% to 40%).
- step 3 — toggle 'does the amount include gst?' — yes for reverse calculation, no to add gst on top.
- step 4 — toggle 'selling within the same state?' — yes shows cgst + sgst split; no shows igst at the full rate.
- step 5 — read the breakdown instantly: taxable value, tax components, and total invoice amount.
GST Calculator Formula
when the price is exclusive of gst (amount does not include gst):
gst amount = (value of supply × gst rate) ÷ 100
price to be charged = value of supply + gst amount
when the price is inclusive of gst (amount already includes gst):
gst amount = value of supply − [value of supply × {100 ÷ (100 + gst rate)}]
GST Calculation Example
example at 18% gst on ₹1,00,000:
| particulars | amount |
|---|---|
| value of the product | ₹1,00,000 |
| add: gst @ 18% (1,00,000 × 18 ÷ 100) | ₹18,000 |
| price to be charged on the invoice | ₹1,18,000 |
Tax Components Under GST
there are four tax components under gst:
cgst (central goods and services tax) — levied on intrastate sales; revenue goes to the central government.
sgst (state goods and services tax) — levied on intrastate sales; revenue goes to the state government. cgst and sgst are always equal halves of the applicable rate.
igst (integrated goods and services tax) — levied on interstate sales at the full rate; collected by the centre and distributed between states.
utgst (union territory gst) — applies in union territories without a legislature, in place of sgst.
Who Should Use This Calculator
- businesses raising gst invoices — quickly verify cgst/sgst or igst amounts before issuing.
- buyers checking that gst charged on a bill is correct.
- sellers or e-commerce operators computing liability for gstr-3b filing.
- accountants and ca firms reconciling purchase and sales registers.
- anyone who needs to reverse-calculate the base price from a gst-inclusive amount.