RERA Carpet Area Calculator in Square Feet

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.

Popular RERA Carpet Area Conversions

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

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 if you want the meaning rather than the maths, read what MOFA carpet area is and how it differs from RERA.

How to Calculate Carpet Area Step-by-Step

1. 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.
2. Enter the known area. Enter the area value and the relevant loading percentage or internal wall estimate.
3. 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.

Frequently Asked Questions

Asking what MOFA carpet area actually means, or how it differs from RERA carpet area? That is covered in full on what MOFA carpet area is and how it differs from RERA.

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