GST Calculator
Add or remove GST at any rate with the CGST/SGST/IGST split.
GST breakup (CGST / SGST / IGST)
| Component | Amount |
|---|---|
| Base amount | ₹10,000 |
| CGST @ 9% | ₹900 |
| SGST @ 9% | ₹900 |
| IGST @ 18% (inter-state, instead of CGST + SGST) | ₹1,800 |
| Total (GST-inclusive) | ₹11,800 |
A GST calculator adds or removes Goods and Services Tax from any amount at India's common rates — 3%, 5%, 12%, 18% and 28%. Enter a price above to instantly see the GST amount, its CGST + SGST split, and the final GST-inclusive or GST-exclusive value, accurate to the paisa.
Use Add GST when you have a base price and need the invoice total — typical for freelancers and businesses that quote 'plus GST'. Use Remove GST when the figure already includes tax, such as an MRP or a restaurant bill, and you want the underlying base value or the exact tax you paid.
How GST is calculated
Adding GST to a base price: GST = amount × rate ÷ 100, and total = amount + GST. Within a state the tax splits equally into CGST and SGST (each = GST ÷ 2); on an inter-state supply the full amount is charged as a single IGST instead. Example: 18% GST on ₹1,000 gives GST = 1,000 × 18 ÷ 100 = ₹180 — billed as CGST ₹90 + SGST ₹90 (or IGST ₹180 inter-state) — for a total of ₹1,180.
Removing GST from an inclusive price (reverse GST): base = price ÷ (1 + rate ÷ 100). Example: ₹1,180 inclusive of 18% GST → base = 1,180 ÷ 1.18 = ₹1,000, so the tax portion is ₹180. Note that you divide — subtracting 18% of ₹1,180 (₹212.40) would overstate the tax. Fractional amounts work the same way: 5% on ₹999 is exactly ₹49.95, for a total of ₹1,048.95.
How to use this calculator
- Pick Add GST if your amount excludes tax (a quote or base price), or Remove GST if it already includes tax (an MRP or a bill).
- Set the amount with the slider or type it into the value box.
- Choose a rate slab — 3%, 5%, 12%, 18% or 28% — or fine-tune any rate from 0% to 28% in 0.25% steps with the custom-rate slider.
- Read the base, GST and total instantly, and open the breakup table for the CGST, SGST and IGST components on your invoice.
GST slabs, IGST and the composition scheme
Most goods and services fall into a handful of slabs: 5% covers many essentials and small restaurants, 12% and 18% cover the bulk of processed goods and services (18% is the default for most services, electronics and software), and 28% applies to luxury and sin goods such as large cars and aerated drinks, often with an additional cess on top. Gold and jewellery use a special 3% rate. The GST Council revises slabs from time to time, so confirm the current rate for your product on the CBIC portal before invoicing.
Whether you charge CGST + SGST or IGST depends only on geography: intra-state sales split the same total tax between the Centre and the state, while inter-state sales carry a single IGST at the full rate — the total tax and the final price never change. Small businesses with turnover up to ₹1.5 crore can opt for the composition scheme instead: they pay a flat 1% (traders and manufacturers), 5% (restaurants) or 6% (other eligible services) on turnover, cannot collect GST from customers, and cannot claim input tax credit.
Frequently asked questions
What is the difference between CGST, SGST and IGST?
CGST goes to the Central government and SGST to the state government; on a sale within one state the GST rate is split equally between the two (18% = 9% CGST + 9% SGST). IGST applies to inter-state sales and imports — the full rate is charged as one tax and later apportioned between Centre and state. The total tax you pay is identical either way.
How do I remove GST from an MRP or bill amount?
Divide the inclusive price by (1 + rate ÷ 100): for ₹1,180 at 18%, the base is 1,180 ÷ 1.18 = ₹1,000 and the GST is ₹180. Don't simply take 18% of the inclusive price — that computes tax on tax and gives the wrong answer. Switch this calculator to Remove GST to do it automatically.
Is the printed MRP inclusive or exclusive of GST?
MRP (Maximum Retail Price) is always GST-inclusive by law — a shop cannot add GST on top of the MRP. Business quotes and B2B invoices, on the other hand, are commonly GST-exclusive, which is why they say 'plus GST as applicable'. Use Remove GST for MRPs and Add GST for exclusive quotes.
What are the common GST rates in India?
The main slabs are 5%, 12%, 18% and 28%, with 18% covering most services and consumer goods, plus a special 3% rate for gold and jewellery and 0% for many unprocessed essentials. Some 28%-slab items also attract a compensation cess. Rates are revised by the GST Council, so check the CBIC rate finder for the latest classification of your product.
What is the GST composition scheme?
It is a simplified option for small businesses with annual turnover up to ₹1.5 crore (₹75 lakh in some special-category states). They pay a flat tax on turnover — 1% for traders and manufacturers, 5% for restaurants, 6% for other eligible services — file quarterly, cannot charge GST separately on bills, and cannot claim input tax credit.
Do CGST and SGST always split the rate equally?
Yes — on an intra-state supply the GST rate is always halved, so 18% is billed as 9% CGST + 9% SGST and 5% as 2.5% + 2.5%. On an inter-state supply there is no split at all: the entire rate is charged as IGST. This calculator shows both views in its breakup table.
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Disclaimer: results are estimates based on the inputs and published rules/rates, for information only — not investment, tax or legal advice. Verify important decisions with a qualified professional. See our full disclaimer.