Tools · Measurement
Carpet area to super built-up area
The Real Estate (Regulation and Development) Act, 2016 defines carpet area in section 2(k). Nothing defines super built-up area, and nothing regulates the loading factor that separates them — it is a commercial convention, set by the seller, and it is even worked out two different ways from the same pair of numbers. This page runs both conversions on figures you supply, and is precise about the one thing it cannot supply: what the area you were quoted actually measures.
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Two numbers go in
In square feet. Commas are forgiven.
From the seller, in writing. This page holds no loading factor for any project — including ours. Nothing you type leaves the browser.
The conversion
Put your figure and your factor in
Two numbers go in: the area you were quoted, and the loading factor you were given. Two numbers come out, because the loading factor is worked out two different ways in ordinary use and nobody has ever fixed which.
In square feet. Commas are forgiven. If you were quoted in square metres, our plot size converter will change the unit first.
A percentage, from the seller, in writing. This page holds no loading factor for any project — including ours — because there is none to hold: no authority fixes one and no register publishes one.
Nothing to convert yet
Enter an area and a loading factor. The full reckoner below is on this page whether you type anything or not, and it is computed by the same two formulas this panel uses.
Nothing is fetched and nothing is stored. The page holds no table of projects to look your figure up in — it does arithmetic on the characters you give it.
One of the three is defined
What the Act actually says
Three area figures are quoted at buyers in this market. A statute defines exactly one of them, and the definition is unusually specific about its edges.
“carpet area” means the net usable floor area of an apartment, excluding the area covered by the external walls, areas under services shafts, exclusive balcony or verandah area and exclusive open terrace area, but includes the area covered by the internal partition walls of the apartment.
The Explanation to the clause defines “exclusive balcony or verandah area” and “exclusive open terrace area” as the balcony, verandah or open terrace appurtenant to the net usable floor area of the apartment and meant for the exclusive use of the allottee.
- Carpet areaDefined by statute
- Carpet area is defined in section 2(k) of the Real Estate (Regulation and Development) Act, 2016 as the net usable floor area of an apartment, excluding the area covered by the external walls, areas under services shafts, exclusive balcony or verandah area and exclusive open terrace area, but including the area covered by the internal partition walls of the apartment.
- Built-up areaNo statutory definition
- Built-up area is the floor area of an apartment measured to include the walls, and in common usage the balcony as well — it is carpet area plus the wall thickness and usually the balcony. The Real Estate (Regulation and Development) Act, 2016 does not define it, so exactly what a given seller includes has to be asked rather than assumed.
- Super built-up areaNo statutory definition
- Super built-up area is built-up area plus a share of the building's common areas — lobbies, staircases, lifts, corridors and, depending on the seller, amenity spaces. It has no statutory definition, and the proportion added on, commonly called the loading factor, is a commercial convention that differs between projects.
These three definitions are transcribed once for the whole site, in our glossary, and read from there rather than re-typed here. A statute quoted in two places is a statute that eventually says two things.
SourceSUYUG Infra
The unregulated middle
The loading factor is worked out two ways
Nothing fixes the loading factor: not the Act, not the regulator, not any standard. It is decided by the seller, and which common areas go into it are decided by the seller too. What is less well known is that the same percentage means two different things depending on what it is a percentage OF.
Loading added to carpet
super built-up = carpet × (1 + loading ÷ 100)
The percentage is a percentage of the carpet area.
The percentage is read as an addition to the home you live in. A 30% loading on this reading means the quoted area is the carpet area plus another 30% of the carpet area.
Loading taken out of super built-up
carpet = super built-up × (1 − loading ÷ 100)
The percentage is a percentage of the super built-up area.
The percentage is read as the share of the quoted area that is not your home. A 30% loading on this reading means 30% of the quoted figure is common area, and 70% is carpet.
| Loading | Carpet, loading added to carpet | Carpet, loading taken out of super | The gap |
|---|---|---|---|
| 10% | 909 | 900 | 9 |
| 15% | 870 | 850 | 20 |
| 20% | 833 | 800 | 33 |
| 25% | 800 | 750 | 50 |
| 30% | 769 | 700 | 69 |
| 35% | 741 | 650 | 91 |
| 40% | 714 | 600 | 114 |
The right-hand column is the argument. At a stated 40% the two readings of the same quote differ by 114 square feet — on a figure of 1,000. That gap is not a rounding difference and it is not anybody being dishonest. It is what happens when a number in common use has no definition behind it, and it is why “the loading is 40%” is not yet a fact you can act on.
If you already have both numbers
Then you do not need a factor from anybody — you can read it off the pair. Here too the answer comes out twice.
Enter both figures and the two readings appear here. Nothing is sent anywhere.
Worked example
Our own published areas, and the word that is missing from them
The honest way to demonstrate this is with our own numbers rather than a stranger's. Every figure below is read out of the project data this site is built on. What that data does not record is what the figures measure — and rather than fill the gap, this page publishes it.
| Project | Configuration | Area as published | Basis recorded |
|---|---|---|---|
| THE1 | 3 BHK Luxury | 1601 – 1939 sq.ft | Not stated |
| THE1 | 4 BHK Luxury Penthouse | 3122 – 3573 sq.ft | Not stated |
| Saffron | 3 BHK Premium | 1896 & 1976 sq.ft | Not stated |
| Saffron | 3 BHK Grande | 2088 sq.ft | Not stated |
| Saffron | 4 BHK Luxury | 2543 & 2612 sq.ft | Not stated |
5 configurations, 5 areas, and not one recorded basis. Our project data carries a configuration label and a figure, and it has no field for whether that figure is carpet, built-up or super built-up. So this page does not convert any of them, and it does not tell you what they are.
That is not modesty and it is not a hedge. It is the exact defect this page is about, found in our own file — and the correct response to finding it is to say so, not to guess a word that would make the table look complete. If a basis is added to that data, this paragraph stops being true and somebody has to come back and rewrite it, which is precisely the property a published claim should have.
The figure that governs is not a website’s anyway. It is the carpet area in your agreement for sale and in the promoter’s declaration to the regulator, searchable by registration number on the authority’s own portal. Our registrations, with the numbers to search, are on our RERA page.
SourcesSUYUG InfraSUYUG InfraKarnataka Real Estate Regulatory Authority — K-RERA portal (opens in a new tab)
Four things to ask for in writing
The carpet area for your specific unit, in writing, with the unit number on it
Not the configuration, not the tower, not a range across the project — the apartment you are buying. Ranges exist because floor plates differ, and yours is one plate.
The balcony, verandah and open terrace areas, stated separately
Section 2(k) puts them outside carpet area. Stated separately they are information; folded in silently they are a way of making one figure look like another.
The super built-up figure the price is being quoted on, and which of the two loading conventions the seller is using
Both are in ordinary use and they give different answers from the same pair of areas. A loading factor quoted without its convention is not yet a number.
The declared particulars on the regulator's register, read yourself
A registered project's declarations sit on the authority's portal under the registration number. That is the copy nobody involved in selling to you can edit.
Read this before you rely on it
What this tool cannot do
A tool that only says what it can do is an advertisement. These five sentences are the difference between this page and a converter that returns a confident number and stops.
This page does not measure anything. It applies a factor you supply to a figure you supply, and prints the arithmetic. If the factor is wrong the answer is wrong, and nothing here can tell you that it is.
It cannot tell you any project's loading factor, including ours. No authority fixes one, no register publishes one as a field, and there is no standard list of which common areas belong inside a super built-up figure. It is a commercial convention decided by the seller.
It does not know what SUYUG's published areas measure. Our project data records the figure and not its basis, so this page will not convert one — and neither should any other page that does not hold the missing word.
The carpet area that has legal effect is the one in your agreement for sale and in the promoter's declaration to the regulator. A number computed on this page is an estimate you made; that number is a term of your contract.
Balcony, verandah and exclusive open terrace are outside carpet area as section 2(k) defines it. A figure described as carpet area with a balcony folded into it is not the statutory figure, and comparing it against one that is will mislead you in the seller's favour.
Sources
What was read, and what it holds up
The register on which a Karnataka project's declared particulars — including the carpet area declared for each apartment type — are held and searched.
The register a project on Tamil Nadu land is registered on, and searched on.
SUYUG's own published configuration areas and plot sizes, which every worked example on these pages is derived from rather than re-typed. What our project data does NOT record is the basis those apartment areas are stated on, and that absence is itself published here.
The registration numbers and survey lines transcribed from SUYUG's own certificates — the primary-source route to the declared particulars that a brochure area is not a substitute for.
The verbatim text of section 2(k) of the Real Estate (Regulation and Development) Act, 2016, transcribed once for the whole site. Every quotation of it on these pages is read out of that one entry rather than re-typed.
Every address above was opened on . Government sites move their pages; if one of these no longer resolves, the fact it holds up is unverified until someone finds where it went, not true because it was true once.
Statutes are cited by Act and section rather than linked. The consolidated official text lives on India Code, published by the Government of India, and the citation is the address — a section number takes you to the same words wherever you read them, and survives a portal reorganising its URLs.