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GST Calculator,
add or remove tax in one tap.
Work out Goods & Services Tax on any amount — add it to a net price or strip it from a gross one — with country presets for India, Australia, New Zealand, and Canada, plus the CGST / SGST split for India.
Intra-state GST splits 50/50 into CGST + SGST.
Gross (incl. GST)
₹1,180.00
₹1,000.00 + ₹180.00 GST
Tax breakdown
For an intra-state supply, GST is shared equally between the central (CGST) and state (SGST) governments.
Field guide
What GST is and how to calculate it.
Goods and Services Tax (GST) is a value-added tax charged on most goods and services in countries including India, Australia, New Zealand, Canada, and Singapore. The seller adds GST at the point of sale and passes it to the government, so the tax is built into the price the customer pays. This calculator handles the two things you actually need: adding GST to a pre-tax price, and removing it from a tax-inclusive one.
How to add GST
When you have a net (pre-tax) amount and want the final price, multiply by the rate and add it on:
Example: a ₹1,000 item at 18% GST has ₹180 of tax, for a gross price of ₹1,180.
How to remove GST
When you only know the gross (tax-inclusive) price, you can't just take 18% off — the tax was charged on the smaller net figure. Instead you divide it back out:
Example: a ₹1,180 gross price at 18% is ₹1,180 ÷ 1.18 = ₹1,000 net, confirming ₹180 of GST. This “reverse GST” calculation is the one people get wrong most often by subtracting the rate directly.
India: CGST and SGST
India runs a dual GST. For a supply made within a state (intra-state), the total GST is split into two equal components:
- CGST — Central GST, collected by the central government.
- SGST — State GST, collected by the state government.
Each takes half the rate, so 18% GST appears on the invoice as 9% CGST + 9% SGST. For supplies between states (inter-state), a single IGST at the full rate is charged instead and later apportioned. India's main slabs are 5%, 12%, 18%, and 28%, with essentials taxed lower and luxury or “sin” goods at the top.
Canada: GST, HST, and PST
Canada layers federal and provincial tax:
- GST — a flat 5% federal tax that applies everywhere.
- HST — in participating provinces the federal and provincial portions are combined into one Harmonized Sales Tax (e.g. 13% in Ontario, 15% in Nova Scotia, New Brunswick, Newfoundland & Labrador, and PEI).
- PST / QST — other provinces charge a separate provincial tax on top of the 5% GST (e.g. British Columbia's 7% PST for 12% total, or Quebec's QST for about 14.975%).
Australia & New Zealand
Both keep it simple with a single broad rate: Australia charges 10% GST on most goods and services, and New Zealand 15%. A handful of items (such as basic foods or financial services) may be exempt or zero-rated under local rules.
Exporting your breakdown
Use the Export PDF button above the calculator to save a clean report of the net, GST, and gross figures — including the CGST/SGST split for India — for invoices, expense records, or sharing with a client.
Disclaimer: This GST calculator is for informational purposes only. Tax regulations vary by jurisdiction. Please consult a qualified tax professional or official government guidelines for tax filings.