GST Calculator Add or remove GST with CGST / SGST split
Add GST to a price or strip it out of a tax-inclusive one, with the CGST and SGST split shown separately.
Enter the amount before tax; GST will be added on top.
About GST Calculator
Goods and Services Tax in India is a single destination-based tax, but on a domestic invoice it is always reported as two equal halves: CGST going to the central government and SGST to the state, each exactly half of the total rate. An 18% invoice is therefore shown as 9% CGST plus 9% SGST, and this calculator splits every result that way automatically for intra-state supply.
Two modes cover the two situations you actually meet. "Add GST" takes a pre-tax price and applies the rate — 10,000 at 18% becomes 11,800 with 1,800 of tax. "Remove GST" takes a tax-inclusive shelf price and works backwards, dividing by (1 + rate) so the base comes out as 8,474.58 and the tax as 1,525.42 — simply subtracting 18% from 11,800 would be wrong and is the most common mistake on invoices. Inter-state supplies use IGST at the full rate instead of the CGST/SGST pair.
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