Carpet Area & Loading Calculator
Compute carpet, built-up, super-built-up, and loading percentage.
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Formula & Assumptions
Source: RERA Real Estate Act, 2016 · Effective: 2017-05-01- Loading % = (Super Built-up − Built-up) / Built-up × 100.
- Typical Kolkata loading: 25-35%.
- RERA mandates sale on carpet area.
Carpet area is the usable area within the walls of your apartment (where you can lay a carpet). Built-up area = carpet area + walls + balcony. Super built-up area (also called saleable area) = built-up area + your proportionate share of common areas (lobbies, lifts, staircases, clubhouse, etc.). Developers price properties on super built-up area, but you only use carpet area.
In Kolkata, loading percentages typically range from 25% to 45%. A loading of 25-30% is considered reasonable and transparent. Anything above 40% means you're paying for a lot of space you can't use. RERA mandates that developers disclose carpet area explicitly, so you can calculate exact loading. If a project advertises 1,000 sqft super built-up with 35% loading, your actual carpet area is only 650 sqft.
Price per carpet sqft = Total Price ÷ Carpet Area (not super built-up area). For example, if a 1,200 sqft super built-up flat costs ₹90 lakh with 30% loading, the carpet area is 840 sqft. Price per super built-up sqft = ₹7,500, but price per carpet sqft = ₹10,714. Always compare projects on carpet area PSF for a true apples-to-apples comparison.
Yes. Under RERA (Real Estate Regulation and Development Act, 2016), carpet area is now defined as the net usable floor area of the apartment, excluding the area covered by external walls, but including the area covered by internal partition walls. Previously, developers could exclude internal walls from carpet area calculations, making spaces appear larger. RERA also mandates that the agreement must clearly state carpet area, not just super built-up area.
Developers quote on super built-up area because it makes the per-sqft price appear lower, and it allows them to charge buyers for common amenities (lobbies, lifts, gardens, clubhouses) proportionately. A project at ₹7,000/sqft super built-up sounds cheaper than ₹9,000/sqft carpet - even though the total price may be the same. RERA has improved transparency, but buyers must still calculate effective carpet PSF themselves.
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