— Tax, VAT & Sales
GST Calculator
Add GST to a price or strip it out of a GST-inclusive total. Pick an Indian slab (5, 12, 18 or 28%) and the calculator splits the tax into CGST and SGST for intra-state supply, or IGST for inter-state — or choose another GST country, or enter any rate.
Gross (incl. GST)
$1,180
- GST
- $180
- Net (excl. GST)
- $1,000
- Rate used
- 18%
- CGST (9%)
- $90
- SGST (9%)
- $90
— How it works
Adding: GST = net × rate ÷ 100, gross = net + GST. Removing: net = gross ÷ (1 + rate ÷ 100). Intra-state India: CGST = SGST = half the rate each; inter-state: IGST = the full rate.
Adding and removing GST
GST works like VAT: a percentage added to the price of goods and services. To add it, multiply the net price by the rate and add it on; to remove it from a GST-inclusive total, divide by one plus the rate — not subtract the rate, since the GST sits on the smaller net amount. India runs four main slabs — 5%, 12%, 18% and 28% — with essentials at the low end and luxury or “sin” goods at 28%; 18% is the workhorse rate for most services. Other countries use a single rate: Australia 10%, New Zealand 15%, Singapore 9%, Canada’s federal GST 5%.
Worked example — ₹1,000 of services at 18% GST: GST = ₹1,000 × 18% = ₹180, so the gross is ₹1,180. Intra-state, that ₹180 splits into CGST ₹90 (9%) and SGST ₹90 (9%).
CGST, SGST and IGST — India’s split
India’s GST is a dual tax, and which components apply depends on whether the supply crosses a state border. For an intra-state sale — buyer and seller in the same state — the GST is split equally between the Central government (CGST) and the State government (SGST): an 18% rate is 9% CGST + 9% SGST. For an inter-state sale, a single Integrated GST (IGST) at the full rate is charged instead and collected by the centre, which later apportions it. The total tax is the same either way; only the split differs. Switch the supply type under the advanced options to see CGST/SGST or IGST.
The slabs and what falls where
The slab determines the rate: 5% covers essentials like packaged food and basic necessities; 12% and 18% cover most standard goods and services (18% is the default for services); and 28% applies to luxury items, cars and tobacco, sometimes with an additional cess on top that this calculator does not model. Removing GST from an inclusive price uses the same divide-by-one-plus-the-rate rule as VAT, so a ₹1,180 inclusive price at 18% is ₹1,000 net with ₹180 of GST. The same arithmetic — and this calculator — works for GST anywhere; only India adds the CGST/SGST split.
— Reader questions
How do I calculate GST?
To add GST, multiply the net price by the rate as a decimal and add it: ₹1,000 at 18% is ₹180 GST, for a ₹1,180 total. To remove GST from an inclusive price, divide by one plus the rate: ₹1,180 ÷ 1.18 = ₹1,000 net.
What is the difference between CGST, SGST and IGST?
For a sale within one state (intra-state), GST is split equally into CGST (central) and SGST (state) — 18% becomes 9% + 9%. For a sale between states (inter-state), a single IGST at the full rate is charged instead. The total tax is identical; only who collects it differs.
What are the GST slabs in India?
The four main slabs are 5%, 12%, 18% and 28%. 5% covers essentials, 12% and 18% most goods and services (18% is the common rate for services), and 28% luxury and “sin” goods — sometimes with an extra cess. Some items are exempt or zero-rated.
How do I remove GST from a total?
Divide the GST-inclusive amount by one plus the rate. At 18%, divide by 1.18: a ₹1,180 total is ₹1,000 net with ₹180 of GST. Choose “remove GST” and the calculator does it.
Does GST work the same in Australia or Canada?
The add/remove maths is identical — Australia’s GST is a flat 10%, New Zealand 15%, Singapore 9%, Canada’s federal GST 5%. They use a single rate with no CGST/SGST split, which is unique to India’s dual structure. Pick the country or enter the rate.