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GST Calculator India

This free GST calculator adds or removes GST from any amount across all applicable India slab rates. Adjust any input below and your results update instantly.

Your details

Adjust the inputs below and your results update instantly.

GST rate

Pick the slab that applies to this good or service (GST 2.0 slabs, current as of July 2026).

e.g. 18% (standard rate)

Amount already includes GST

Off adds GST on top instead.

Interstate supply

Off splits GST into CGST + SGST instead.

Amount (₹)*

≈ ₹1.00 L

The amount to add or remove GST from. Toggle above whether this already includes GST.

₹0₹1Cr

e.g. ₹1,00,000

These are example numbers. Edit any input on the left to see your own.

Total amount, including GST

₹1.18 L

18% GST

Base amount

₹1.00 L

GST amount

₹18,000

₹9,000 CGST + ₹9,000 SGST. Total: ₹1.18 L.

Every rate, side by side

For the same ₹1.00 L amount, across every rate this calculator covers.

RateGST amountTotal amountStatus

Nil (0%): essentials, life-saving drugs₹0₹1.00 L

85% of your selected total

5%: essential goods & services₹5,000₹1.05 L

89% of your selected total

18%: standard rate₹18,000₹1.18 L

Selected

100% of your selected total

40%: luxury & sin goods₹40,000₹1.40 L

40%

100% of your selected total

3%: gold, silver & precious metal jewellery₹3,000₹1.03 L

87% of your selected total

Compare scenarios

See how a larger amount or a higher slab would change your GST.

Your plan

18% GST

₹18,000

GST amount

Baseline

Amount ×2

₹2.00 L

₹36,000

GST amount

+₹18,000

Next slab (40%)

Same amount

₹40,000

GST amount

+₹22,000

Worked example, using your numbers

A step-by-step walkthrough at 18% GST.

Step 1 · Base amount

Before GST, the amount is

₹1.00 L

Step 2 · GST amount

At 18%, GST comes to

₹18,000

Step 3 · Total amount

Adding GST to the base gives

₹1.18 L

✓

At 18% GST, ₹1.00 L becomes ₹1.18 L, a GST amount of ₹18,000.

Personalised insights

What your numbers reveal, and what changing them would do.

₹18,000 of GST is added to your ₹1.00 L

The final GST-inclusive amount comes to ₹1.18 L.

At 18%, this falls under: standard rate

Post-GST 2.0, this is one of 5 rates this calculator covers, since the 12% and 28% slabs no longer exist.

₹9,000 CGST + ₹9,000 SGST

This sale is within the same state, so GST splits evenly between Central GST and State GST, same total either way.

The next slab up (40%) would add ₹22,000 more

Same amount, but classified one rate slab higher: see the full comparison below.

How this is calculated

Every step of the math behind your result, shown in the open.

Adding GST to an exclusive amount

Base = the amount before GST, r = the GST rate as a decimal, Total = amount including GST

If your starting amount doesn't yet include GST, multiply it by (1 + rate) to get the final, GST-inclusive amount.

Example: ₹1.00 L × (1 + 18%) → ₹1.18 L

Removing GST from an inclusive amount

Total = the amount including GST, r = the GST rate as a decimal, Base = amount before GST

If your starting amount already includes GST, divide by (1 + rate) instead of subtracting the rate, to back out the original base amount.

Example: Not applicable here: this amount doesn't include GST yet

CGST + SGST vs. IGST

GST = the total GST amount, CGST/SGST = each half (sale within the same state), IGST = the full amount (sale across states)

The total GST charged is identical either way; only the label and which government collects which portion differs.

Example: ₹18,000 ÷ 2 → ₹9,000 CGST + ₹9,000 SGST

GST amount, either direction

Total = amount including GST, Base = amount before GST, GST = the tax amount itself

Whichever direction you started from, the GST amount is always simply the gap between the inclusive and exclusive figures.

Example: ₹1.18 L − ₹1.00 L → ₹18,000 GST

Assumptions

Only the main post-GST-2.0 slabs plus the special 3% gold/jewellery rate are covered. Item-specific exemptions, compensation cess on the remaining sin-goods list, and composition-scheme rates aren't modeled.
CGST/SGST/IGST affects only how the same total GST is structured and reported, and it never changes the total tax paid.
Figures are indicative only, so always confirm the exact rate for your specific good or service against the current GST rate schedule.

Understanding GST

The concept, the motivation, and what to watch out for.

One tax, but which rate, and is it already included?

GST replaced a tangle of older indirect taxes with a single tax applied at every stage of the supply chain. But getting the number right still depends on two things: which rate slab applies, and whether the amount you're starting with already has GST baked in or not.

GST 2.0, effective September 2025, simplified the slab system significantly. This calculator uses the current rates, and shows the GST amount both added to and backed out of any figure you enter.

Adding GST and removing GST use different math

Adding GST multiplies the base amount by the rate. Removing GST from an already-inclusive amount means dividing by (1 + rate), not just subtracting the rate, a common source of small errors.

The slab structure just got simpler

GST 2.0 dropped the 12% and 28% slabs entirely, leaving three main rates (0%, 5%, 18%) plus a new 40% rate for luxury and sin goods.

This is output GST, not your final liability

A registered business nets this amount against input tax credit (GST already paid on purchases) before paying the difference to the government. The number above is what you charge, not necessarily what you owe.

Did you know?

A few facts behind India's GST system.

2025

The biggest GST simplification since launch

GST 2.0, effective 22 September 2025, cut the slab count from four main rates to essentially two (5% and 18%), plus a new 40% rate reserved for luxury and sin goods.

99%

Almost everything at 12% moved to 5%

Of all goods and services previously taxed at 12%, about 99% were reclassified to the 5% slab, a major relief for everyday household items.

40%

A new top rate, reserved for a short list

The 40% rate applies narrowly: aerated drinks, tobacco products, luxury cars, large motorcycles, and personal aircraft or yachts, among a handful of others.

÷ (1+r)

Backing out GST isn't a simple subtraction

To find the base amount inside a GST-inclusive figure, you divide by (1 + rate); subtracting the percentage directly is a common mistake that overstates the base amount.

Cess

Compensation cess mostly disappeared too

GST 2.0 folded compensation cess into the new rate structure for most goods; it survives only on a short list like pan masala, gutkha, and cigarettes, until related loan obligations are repaid.

Frequently asked questions

Straight answers to the questions we hear most about GST.

What are the current GST rates in India?

Following GST 2.0 (effective 22 September 2025), the main slabs are 0% (nil-rated essentials), 5%, and 18% (standard rate), plus a new 40% rate for luxury and sin goods. The older 12% and 28% slabs were abolished: most 12%-rated items moved to 5%, and most 28%-rated items moved to 18%.

What happened to the 12% and 28% GST slabs?

The GST Council eliminated both in the September 2025 reform. About 99% of items that were taxed at 12% moved to 5%, and about 90% of items taxed at 28% moved to 18%, with a small set of luxury and sin goods moved to the new 40% rate instead.

Is this also a reverse GST calculator?

Yes. Switching the mode to "Remove GST" works backwards from a GST-inclusive amount to find the base price and the tax portion, which is what a reverse GST calculator does.

How is removing GST from an amount different from just subtracting the rate?

If ₹118 includes 18% GST, the base amount is ₹118 ÷ 1.18 = ₹100, not ₹118 minus 18% of ₹118. Subtracting the percentage directly overstates the base amount and understates the actual GST portion.

What's the difference between CGST+SGST and IGST?

For a sale within the same state, GST splits evenly into CGST (central) and SGST (state), each half the total rate. For a sale across state lines, the full amount is charged as IGST (integrated GST) instead. The total tax is identical; only how it's structured and which governments collect it differs.

Why is gold taxed differently at 3%?

Gold, silver, and precious metal jewellery have their own special GST rate of 3%, set separately from the main slab system and unaffected by the GST 2.0 slab restructuring.

Is this tax advice?

No. This tool provides indicative estimates based on your inputs and the rates in force at the time. Consult a chartered accountant or check the current GST rate schedule for your specific good or service before filing.