GST Calculator – Add or Remove GST Instantly

India’s Goods and Services Tax has five main slabs — 0%, 5%, 12%, 18% and 28%. For a sale inside your state, GST splits into CGST + SGST; for inter-state sales it is charged as IGST. This calculator both adds GST to a base price and backs it out of a tax-inclusive invoice.

The formula

Base = Inclusive ÷ (1 + r) | GST = Base × r

FAQ

How do I remove GST from a tax-inclusive price?

Divide the invoice total by (1 + rate). For 18% GST on a ₹11,800 bill: 11,800 ÷ 1.18 = ₹10,000 base, ₹1,800 GST.

Why does GST show as CGST and SGST?

Within one state, GST is dual: the centre takes CGST and the state takes SGST, each half the total rate. Across states it is a single IGST.

What are the GST slabs in India?

The main slabs are 0%, 5%, 12%, 18% and 28%; some luxury and sin goods attract a compensation cess on top of 28%.

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