GST Calculator: 5%, 18% & 40% (GST 2.0 Rates)

Add or remove GST at 5/18/40% in one click.

Amount (₹)

This is the base amount (before GST).

GST rate

Mode

Results

Base amount: ₹10,000.00
GST amount (18%): ₹1,800.00
Total amount: ₹11,800.00

CGST / SGST split

CGST (½ GST)

₹900.00

SGST (½ GST)

₹900.00

For intra-state sales GST is split evenly into CGST and SGST. For inter-state sales the same total is charged as IGST.

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How to use this GST calculator

Enter the amount in rupees. Use the base price if you want to add GST, or the final price if you want to extract GST from a GST-inclusive total.
Pick a GST rate — 5%, 18%, or 40%, or 3% for gold — or use the custom field for other rates.
Choose Add GST or Remove GST. The results panel shows the base, GST, total, and the CGST/SGST split instantly.

GST formula

The three formulas this calculator uses:

GST = Base × (Rate/100)
Total (GST inclusive) = Base × (1 + Rate/100)
Base (from inclusive) = Total / (1 + Rate/100)

CGST and SGST are each half of the total GST amount for intra-state sales. For inter-state sales the same total is levied as IGST instead.

GST rates in India

0% — essentials such as fresh produce, milk, and unbranded food grains.
5% — common household goods, packaged staples, and many transport services.
3% — gold. Diamonds stay at 1.5% or 0.25%; use the custom field for those.
18% — the standard rate covering most services, IT, and a wide range of goods.
40% — the GST 2.0 rate for luxury and sin goods, which replaced the old 28% slab plus cess.

Old vs new GST slabs (from 22 Sep 2025)

What	Before 22 Sep 2025	From 22 Sep 2025
Essentials	0% or 5%	0% or 5%
Most goods and services	12% or 18%	5% or 18%
Luxury and sin goods	28% plus cess	40%
Gold	3%	3%

The 12% and 28% slabs were withdrawn on 22 September 2025. Confirm the rate for a specific HSN with your tax advisor before you invoice.

Frequently asked questions

How do I calculate GST on an amount?

Multiply the base amount by the GST rate divided by 100. For example, GST on ₹10,000 at 18% is 10,000 × 0.18 = ₹1,800, and the GST-inclusive total is ₹11,800. This calculator does it for you instantly and also splits the tax into CGST and SGST.

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

For intra-state transactions GST is split equally between the Central GST (CGST) and the State GST (SGST) — so 18% becomes 9% CGST + 9% SGST. For inter-state transactions the same total rate is charged as Integrated GST (IGST), which the centre later apportions to the destination state.

Is GST included in MRP?

Yes. Under Indian law the Maximum Retail Price printed on packaged goods is the final price to the consumer and is inclusive of all taxes, including GST. To back-calculate the base price, use this calculator in 'Remove GST' mode with the applicable rate.

How do I calculate GST in reverse (when the amount is GST-inclusive)?

Divide the inclusive total by (1 + Rate/100). For example, ₹11,800 at 18% gives a base of 11,800 / 1.18 = ₹10,000, and the GST component is ₹1,800. Switch this tool to 'Remove GST from amount' mode to do this in one click.