What is the difference between GST-inclusive and GST-exclusive amounts?

An exclusive amount is a base price that does not yet contain tax — GST is added on top of it. An inclusive amount is a final price that already contains the tax — GST has to be extracted from within it. The two use different formulas. Adding 18% to ₹1,000 gives ₹1,180, but the GST contained in a ₹1,180 inclusive price is ₹180, which is not 18% of ₹1,180. This tool’s inclusive/exclusive toggle picks the correct formula so you never mix them up.

When does GST split into CGST and SGST, and when is it IGST?

It depends on whether the supply is intra-state or inter-state. If the supplier and the place of supply are in the same state, the tax is split into two equal halves — CGST (collected by the centre) and SGST (collected by the state). If they are in different states, a single IGST applies at the full rate. The total tax is the same either way; only the heads differ. This matters because input tax credit flows along these specific heads and the invoice must show the correct ones.

Which GST rate should I use?

The rate depends on the goods or service, classified by its HSN code (goods) or SAC code (services). Under the GST 2.0 reform effective 22 September 2025, the standard slabs are 5% (essentials and mass-consumption items) and 18% (most other goods and services), with 40% on sin and luxury goods such as tobacco, aerated drinks, and high-end vehicles, and 0% on exempt items. The earlier 12% and 28% slabs were removed in this reform. There are also special rates like 0.25% on rough diamonds and 3% on gold. If you are unsure of the slab for a specific product, check its HSN code against the current CBIC rate schedule — rates are revised periodically by the GST Council.

Are the amounts I enter sent to a server?

No. The entire calculation runs in JavaScript inside your own browser. Nothing you type — amounts, rates, or anything else — is uploaded, logged, or stored anywhere. That makes the tool safe to use with real invoice figures and client numbers. Closing the tab clears everything; there is no account and no history kept on any server.

How is the tax rounded?

Each figure is rounded to two decimal places, the standard for rupee invoicing. When GST splits into CGST and SGST, each half is half of the total tax, so in rare cases the two halves can differ from a naive split by a paisa due to rounding. For invoice-level precision this matches what accounting software produces. For statutory rounding of the final invoice value, follow your usual billing system’s rule, which may round the grand total to the nearest rupee.

Can I use this for both goods and services?

Yes. The arithmetic is identical for goods and services — what changes is only the rate slab and the HSN or SAC classification that determines it. Pick the correct rate for your item and the calculator handles the rest. For services the rate is most often 18%, while goods range across all the slabs, but the inclusive/exclusive and intra/inter-state logic applies the same way to both.

GST

GST Calculator

Add or remove GST at any slab, with the correct CGST/SGST or IGST split — instantly, in your browser. Free, no signup, nothing uploaded.

By the Samastam teamLast updated 2026-06-15Editorial standards

Amount and rate

Amount (₹)

₹

GST rate

Tap a common slab or type any rate — including 0% or a special figure.

Rates reflect the GST 2.0 structure effective 22 September 2025. Always verify against the current CBIC schedule before filing.

Amount type

GST will be added on top of the amount.

Supply type

Buyer and seller are in the same state — GST splits into CGST and SGST.

Breakdown

Base amount: —
CGST @ 9%: —
SGST @ 9%: —
Total GST: —
Total amount: —

Enter an amount on the left. The base, GST split, and total update here as you type.

A GST calculator works out the tax on a transaction under India’s Goods and Services Tax — either adding GST on top of a base price, or extracting the GST already baked into a final price. This tool does both, at every rate slab, and splits the result the way an invoice actually needs it: CGST plus SGST for a sale within one state, or a single IGST for a sale across state lines. Everything runs in your browser, so the numbers you type are never sent anywhere.

Key takeaways

GST can be calculated two ways: exclusive (tax added on top of the base) or inclusive (tax extracted from a price that already contains it). This tool handles both with a single toggle.
For a sale within the same state, GST splits into two equal halves — CGST (central) and SGST (state). For a sale between states, a single IGST applies at the full rate.
Under the GST 2.0 structure effective 22 September 2025, the standard slabs are 5% and 18%, with 40% on sin and luxury goods and 0% on exempt items; the calculator also covers the special 0.25% (rough diamonds) and 3% (gold) rates.
Inclusive extraction matters for retail: a ₹118 MRP at 18% contains ₹18 of GST and ₹100 of base value — getting this backwards over-states your input credit.
The whole calculation happens locally in your browser. No amount you enter is uploaded, logged, or stored, which makes it safe for real invoice figures.

What this is and why it matters

GST looks simple until you actually have to put it on an invoice. The rate might be 18%, but the invoice does not show “18% GST” — it shows 9% CGST and 9% SGST if the customer is in your state, or 18% IGST if they are in another. Get that split wrong and the invoice is technically defective, the buyer’s input tax credit can be questioned, and your returns stop reconciling. A GST calculator exists to get the arithmetic and the split right every time, so the number on the invoice matches the number in the law.

The second trap is the direction of the calculation. Sometimes you have a base price and need to add GST — a manufacturer quoting ₹1,000 plus tax. Other times you have a final, tax-inclusive price and need to pull the GST back out — a shopkeeper with a ₹590 MRP who needs to know how much of that is the 18% tax and how much is the product. These are different formulas: adding 18% to 1,000 gives 1,180, but the GST inside 1,180 is not 18% of 1,180, it is 180. Confusing the two is one of the most common GST errors small businesses make, and it directly mis-states the tax you owe or the credit you claim.

This tool removes both traps. You pick the rate, say whether your amount already includes GST or not, and say whether the supply is within the state or across states. It then shows the base, the exact CGST/SGST or IGST figures, and the total — the complete breakdown an invoice needs, recalculated the instant you change anything.

How to use this tool

Enter the amount. Type the figure you are working with into the amount field — either the pre-tax base price or the final tax-inclusive price, depending on what you have. The breakdown on the right updates the moment you type; there is no calculate button to press and nothing is submitted anywhere.

Pick the GST rate. Tap one of the common slab buttons — 5%, 18%, or 40% — for the usual cases, or type any other rate (0%, or the special 0.25% and 3% figures for rough diamonds and gold) into the custom rate box. The selected slab highlights so you can confirm at a glance which rate is being applied.

Choose inclusive or exclusive. If your amount is a base price that still needs tax added, leave it on “Exclusive of GST.” If your amount is a final price that already contains the tax — a printed MRP, a quoted all-in figure — switch to “Inclusive of GST” and the tool extracts the tax out of it instead of adding more on top.

Choose the supply type. Select “Intra-state” when the buyer and seller are in the same state, and the tool splits the tax into equal CGST and SGST halves the way a local invoice requires. Select “Inter-state” when they are in different states, and it shows a single IGST at the full rate. Read the base, tax split, and total straight off the breakdown panel — they are the exact figures to copy onto your invoice or purchase entry.

Examples and use cases

A Pune consultant adding 18% to a local fee

A management consultant in Pune is billing a Maharashtra client ₹50,000 for a project. Services like this attract 18% GST, and because both parties are in Maharashtra it is an intra-state supply. Entering ₹50,000, choosing 18%, keeping it exclusive, and leaving it intra-state shows ₹4,500 CGST and ₹4,500 SGST, for a ₹59,000 invoice total. Those two separate 9% lines are exactly what the tax invoice must display.

A Surat trader shipping goods inter-state

A textile trader in Surat (Gujarat) sells ₹2,00,000 of fabric to a buyer in Jaipur (Rajasthan). Same 18% rate, but because the supply crosses state lines it is inter-state, so a single IGST applies. Switching the supply type to inter-state shows ₹36,000 IGST and a ₹2,36,000 total — one IGST line instead of a CGST/SGST pair, which is what the buyer in Rajasthan will claim as input credit.

A Chennai shopkeeper extracting GST from an MRP

A retailer in Chennai sells an appliance with a printed all-inclusive price of ₹23,600 at 18% GST. To file correctly she needs the tax hidden inside that price, not added on top. Entering ₹23,600, choosing 18%, and switching to inclusive reveals a base of ₹20,000 and ₹3,600 of GST — ₹1,800 CGST and ₹1,800 SGST for her local sale. Adding 18% to ₹23,600 would have wrongly produced ₹4,248.

A Jaipur jeweller at the 3% gold slab

A jeweller quoting ₹1,50,000 for gold jewellery uses the special 3% GST rate rather than a standard slab. Choosing 3% from the dropdown, exclusive, intra-state, the tool shows ₹2,250 CGST and ₹2,250 SGST and a ₹1,54,500 total — a reminder that not every item sits in the headline 5/18/40 bands.

Frequently asked questions

What is the difference between GST-inclusive and GST-exclusive amounts?: An exclusive amount is a base price that does not yet contain tax — GST is added on top of it. An inclusive amount is a final price that already contains the tax — GST has to be extracted from within it. The two use different formulas. Adding 18% to ₹1,000 gives ₹1,180, but the GST contained in a ₹1,180 inclusive price is ₹180, which is not 18% of ₹1,180. This tool’s inclusive/exclusive toggle picks the correct formula so you never mix them up.
When does GST split into CGST and SGST, and when is it IGST?: It depends on whether the supply is intra-state or inter-state. If the supplier and the place of supply are in the same state, the tax is split into two equal halves — CGST (collected by the centre) and SGST (collected by the state). If they are in different states, a single IGST applies at the full rate. The total tax is the same either way; only the heads differ. This matters because input tax credit flows along these specific heads and the invoice must show the correct ones.
Which GST rate should I use?: The rate depends on the goods or service, classified by its HSN code (goods) or SAC code (services). Under the GST 2.0 reform effective 22 September 2025, the standard slabs are 5% (essentials and mass-consumption items) and 18% (most other goods and services), with 40% on sin and luxury goods such as tobacco, aerated drinks, and high-end vehicles, and 0% on exempt items. The earlier 12% and 28% slabs were removed in this reform. There are also special rates like 0.25% on rough diamonds and 3% on gold. If you are unsure of the slab for a specific product, check its HSN code against the current CBIC rate schedule — rates are revised periodically by the GST Council.
Are the amounts I enter sent to a server?: No. The entire calculation runs in JavaScript inside your own browser. Nothing you type — amounts, rates, or anything else — is uploaded, logged, or stored anywhere. That makes the tool safe to use with real invoice figures and client numbers. Closing the tab clears everything; there is no account and no history kept on any server.
How is the tax rounded?: Each figure is rounded to two decimal places, the standard for rupee invoicing. When GST splits into CGST and SGST, each half is half of the total tax, so in rare cases the two halves can differ from a naive split by a paisa due to rounding. For invoice-level precision this matches what accounting software produces. For statutory rounding of the final invoice value, follow your usual billing system’s rule, which may round the grand total to the nearest rupee.
Can I use this for both goods and services?: Yes. The arithmetic is identical for goods and services — what changes is only the rate slab and the HSN or SAC classification that determines it. Pick the correct rate for your item and the calculator handles the rest. For services the rate is most often 18%, while goods range across all the slabs, but the inclusive/exclusive and intra/inter-state logic applies the same way to both.