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Add it, remove it, see the split.
GST math is simple in principle — a fixed percentage added to or extracted from an amount — but doing it correctly by hand, especially the extraction direction (working backward from a tax-inclusive price to find the original amount), is easy to get subtly wrong, and being off by even a little matters on an invoice. The GST Calculator handles both directions explicitly: add GST to a pre-tax amount to get the final price, or enter a tax-inclusive amount and extract exactly how much of it was tax, with a CGST/SGST split shown for intra-state transactions. It's aimed at small business owners writing invoices, freelancers pricing their services, and anyone in India who needs a quick, reliable GST figure without opening a spreadsheet. The standard slabs (5%, 12%, 18%, 28%) are one tap away, but double-check the applicable rate for your specific goods or service before relying on the output for actual filing — this tool gets the math exactly right, but which rate applies is a separate question worth confirming against an official source.
Entering an amount with Add GST mode:
Inputs
Results
Original amount
$1,000
GST amount
$180
Total amount
$1,180
CGST (Central)
$90
SGST (State)
$90
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