GST (Goods and Services Tax) in India is charged at 0%, 5%, 12%, 18% or 28% depending on the goods or service. This calculator adds GST to a base price (exclusive) or pulls the GST component out of a GST-inclusive price — handy for invoices, quotations and checking bills.
GST amount
₹180
Estimates only. GST slabs and rules are set by the GST Council and can change — verify the applicable rate for your HSN/SAC code. This is not tax advice.
Two directions, one idea — GST is always a percentage of the base price:
Exclusive: GST = Price × Rate ÷ 100 · Total = Price + GST
Inclusive: GST = Price × Rate ÷ (100 + Rate) · Base = Price − GST
The inclusive formula works because the GST-inclusive price equals base × (1 + rate ÷ 100); solving for the tax component gives rate ÷ (100 + rate) of the total.
At an 18% slab:
Notice both directions agree — a useful cross-check when verifying an invoice.
GST amount is the tax component at the selected slab. Total (inclusive of GST) is what the customer actually pays — for exclusive mode it's base + GST; for inclusive mode it's the price you entered, with the base shown implicitly.
Use exclusive mode when quoting ("₹1,000 + GST") and inclusive mode when reverse-checking a bill that already includes tax.
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Content last reviewed on 2026-10-06.