A carpet area calculator converts your flat's carpet area, the net usable floor space measured wall to wall under RERA, into square feet, built-up area, super built-up area, and the older MOFA carpet area used in Maharashtra pre-2017 projects. Under Section 2(k) of the RERA Act 2016, carpet area excludes external walls, service shafts, balconies and verandahs. To convert: enter your carpet area in sq.ft. or sq.m., select built-up loading (typically 10-15%), and select super built-up loading (typically 25-50%). For MOFA conversion, RERA carpet area is approximately MOFA carpet area plus internal wall area. The calculator below gives instant results for all four area types plus price per sq.ft. and shortfall refund estimates.
Preparing for the MahaRERA exam? Carpet area questions usually test Section 2(k), loading percentage, shortfall refund and Section 14(2).
Sq.m. to sq.ft., built-up to carpet, super built-up to carpet, and MOFA to RERA carpet estimates
RERA rule: Under Section 2(k), all properties must be sold and priced on carpet area. If a builder quotes price on super built-up area, calculate the carpet area equivalent before comparing.
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Popular RERA Carpet Area Conversions
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Formula used
Use when
RERA carpet area to square feet converter
sq.m. x 10.7639 = sq.ft.
Your RERA document shows area in square metres.
How to calculate carpet area from built up area
built up area / (1 + built up loading %)
You know built up area but need RERA carpet estimate.
Super built up area to carpet area
super built up / (1 + loading %)
The builder quoted saleable or super built up area.
RERA carpet to built up area calculator
carpet area x (1 + built up loading %)
You know RERA carpet and want a built up estimate.
MOFA to RERA carpet area
MOFA carpet + internal wall area
You are comparing old Maharashtra/MOFA documents with RERA carpet disclosure.
What is Carpet Area Under RERA?
For MahaRERA carpet area calculation, start with Section 2(k): RERA carpet area is the net usable floor area plus internal partition walls, excluding external walls, service shafts, exclusive balcony/verandah area and exclusive open terrace area.
Section 2(k) of the RERA Act 2016 defines carpet area precisely: it is the net usable floor area of an apartment, including the area covered by internal partition walls, but excluding:
External walls
Areas under services shafts (pipe ducts, electrical shafts)
Exclusive balcony or verandah area
Exclusive open terrace area
Internal staircases within the apartment, internal bathrooms, store rooms, and internal passage areas are included in carpet area. This is often misunderstood. Carpet area does not mean only the floor space where a carpet can be laid. It includes usable area inside the flat, including internal walls, bathrooms, and passages.
The Three Area Definitions Explained
Area Type
What It Includes
Typical Size vs Carpet
Carpet Area
Net usable area + internal walls (excl. external walls, balconies, shafts)
Base — smallest
Built-up Area
Carpet area + external walls + balconies/terraces
~10-15% more than carpet
Super Built-up Area
Built-up area + proportionate share of common areas (lobbies, lifts, gym, pool etc.)
~25-50% more than carpet
RERA Carpet Area vs MOFA Carpet Area: Key Differences
MOFA carpet area comes from the Maharashtra Ownership Flats Act, 1963 and was the standard in Maharashtra agreements before RERA. The two definitions do not match: MOFA carpet area generally excludes internal partition walls but included balconies in common builder practice, while RERA carpet area under Section 2(k) includes internal walls and explicitly excludes balconies, verandahs and open terraces.
In practice, the difference between the two figures for the same flat is usually in the range of 5-10%, driven mostly by internal wall thickness and balcony treatment. When comparing an old MOFA-era agreement with a RERA disclosure, never assume a fixed conversion percentage. Use the MOFA mode in the calculator above, and read our detailed MOFA vs RERA carpet area explainer for the full legal background.
How to Calculate Carpet Area Step-by-Step
Choose the conversion mode. Select square metre to square feet, built-up to carpet, super built-up to carpet, or MOFA to RERA carpet conversion.
Enter the known area. Enter the area value and the relevant loading percentage or internal wall estimate.
Review the RERA carpet area. Use the calculated square feet value and effective price per sq.ft. to compare properties fairly.
Why Loading Percentage Matters
Before RERA, developers quoted prices on super built-up area — the largest number. A 1,200 sq.ft. SBA flat might have only 780 sq.ft. of carpet area. Loading = (1200-780)/780 = 53.8%. You were paying for 1,200 sq.ft. but using only 780 sq.ft. exclusively.
RERA fixed this by mandating carpet area pricing. Now you can compare two flats with different loading percentages on a common basis. A flat priced at ₹8,000/sq.ft. on carpet area is directly comparable to another flat at ₹8,000/sq.ft. on carpet area — regardless of their loading percentages.
Carpet Area Shortfall — Your RERA Right
Under Section 14(2) of RERA, if the carpet area you receive at possession is less than what was promised in your agreement for sale, you are entitled to a proportionate refund. The refund is calculated at the rate per sq.ft. agreed in the sale agreement. Accepting possession does not waive this right — it survives even after you move in.
Example: Agreement says 900 sq.ft. at ₹9,000/sq.ft. Delivered: 850 sq.ft. Shortfall: 50 sq.ft. Refund: 50 × ₹9,000 = ₹4.5 lakh. File a complaint with MahaRERA if the promoter does not pay voluntarily.
How to Verify Carpet Area Before Possession
Before accepting possession, measure the carpet area yourself or hire a licensed surveyor. Compare with the carpet area mentioned in your registered agreement for sale. If there is a discrepancy of more than a minor tolerance, document it in the possession letter. Do not sign the possession letter without noting any shortfall in writing.
On the MahaRERA portal, the promoter must disclose the carpet area of each apartment at registration. Check if the carpet area disclosed on the portal matches what is in your agreement — any discrepancy should be raised with MahaRERA before possession.
Carpet Area Is a Core Exam Topic
Section 2(k) definition, loading calculation, and the Section 14(2) shortfall remedy appear in the MahaRERA IBPS exam regularly.
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Frequently Asked Questions
Does carpet area include the bathroom?
Yes. Under RERA's definition of carpet area, internal bathrooms, toilets, store rooms, internal passages, and internal staircases within the apartment are included. Carpet area means usable enclosed space inside the flat boundaries, excluding external walls, balconies, shafts, and open terraces.
How do I convert RERA carpet area to square feet?
If your RERA carpet area is written in square metres, multiply it by 10.7639 to get square feet. Example: 65 sq.m. x 10.7639 = 699.65 sq.ft. If the document already says sq.ft., no unit conversion is needed.
How do I calculate carpet area from built-up area?
Use this estimate: carpet area = built-up area / (1 + built-up loading %). For example, if built-up area is 950 sq.ft. and the built-up loading is 15%, estimated carpet area is 950 / 1.15 = 826.09 sq.ft. Use the official RERA disclosed carpet area for final decisions.
How do I convert MOFA carpet area to RERA carpet area?
There is no fixed legal conversion percentage. MOFA carpet area generally does not include internal wall area, while RERA carpet area includes internal partition wall area. The reliable conversion is: RERA carpet area = MOFA carpet area + measured internal wall area. A percentage estimate is only for rough comparison.
What is a typical loading percentage in Maharashtra?
In Maharashtra, loading percentages vary significantly by location and project type. Older buildings in Mumbai: 20-30% loading. New mid-rise projects in suburbs: 30-40%. Premium projects with extensive amenities (pool, gym, clubhouse): 40-55%. Any loading above 50% should be questioned — calculate and compare the carpet area price per sq.ft. before deciding. RERA has made this comparison easier by mandating carpet area disclosure.
Is balcony area included in carpet area under RERA?
No. Exclusive balcony and verandah area is explicitly excluded from the carpet area definition under Section 2(k) of RERA. However, the builder must still disclose balcony area separately. When comparing flats, be aware that a flat with a larger balcony may have a smaller carpet area than a flat with no balcony, even if the total built-up area is similar.
How many square feet is 500 carpet area?
500 carpet area equals 500 square feet under RERA, since carpet area is already stated in square feet (or square metres, in which case multiply by 10.7639). The built-up area for a 500 sq.ft. carpet area flat is approximately 550-575 sq.ft. at 10-15% loading, and the super built-up area is approximately 625-750 sq.ft. at 25-50% loading.
What is the carpet area for 1200 square feet?
If 1200 sq.ft. refers to super built-up area, the carpet area is approximately 800-960 sq.ft. depending on loading (1200 / 1.25 = 960 at 25% loading; 1200 / 1.50 = 800 at 50% loading). If 1200 sq.ft. is built-up area, carpet area is approximately 1043-1091 sq.ft. at 10-15% built-up loading. Always confirm the RERA-disclosed carpet area on the MahaRERA portal.
How much difference is there between RERA carpet and MOFA carpet area?
Typically 5-10% for the same flat. RERA carpet area includes internal partition walls, which MOFA carpet area generally does not, while MOFA-era practice often counted balconies that RERA excludes. There is no fixed legal conversion percentage, so measure internal wall area for a reliable conversion rather than applying a flat percentage.
Can a builder change the carpet area after the agreement is signed?
Not without consequences. Under Section 14(2) of RERA, if the delivered carpet area is less than what was agreed, the buyer gets a proportionate refund. Any alteration in the sanctioned plans (which would affect carpet area) requires written consent of at least two-thirds of allottees. A unilateral reduction in carpet area is a serious RERA violation that can be complained about to MahaRERA.
Disclaimer: Area calculations are approximate. Actual carpet area must be professionally measured. For RERA complaints related to carpet area shortfall, file on maharera.mahaonline.gov.in. RERAExam is not affiliated with any government authority.
These calculations appear directly in the MahaRERA IBPS certification exam. Practise with 900+ adaptive agent exam mock test questions across all 7 topics.