Carpet Area to Built-up Area Converter
Key Takeaway
RERA carpet area is the net usable floor area excluding external walls and service shafts. Builder loading (20–35%) converts carpet area to super built-up area — meaning you pay for 25–35% more area than you actually use.
Carpet Area to Built-up Area Converter
Estimate super built-up spaces based on loading factor calculations.
Calculated Spaces
What to do next
Based on your Carpet Area to Built-up Area Converter, here are the tools you should try next:
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The Builder's Invisible Tax
When a builder sells you a '1,500 Sq Ft' apartment, you are not getting 1,500 sq ft inside your house. You are paying for the 'Super Built-up Area', which includes your share of the elevator, lobby, staircase, and clubhouse. The difference between what you pay for and what you actually live in is dictated by the 'Loading Factor'.
The Illusion of Space: Rohan's 3BHK
He imagines massive bedrooms and a huge living room.
He asks for the RERA Carpet Area document.
The carpet area is only **1,100 Sq Ft**.
The builder applied a massive **63% loading factor** because the society has a 50,000 sq ft clubhouse, 3 swimming pools, and massive grand lobbies.
Rohan realizes that for every ₹100 he is paying, ₹38 is going towards common areas he might never use, and only ₹62 is going towards the space inside his house. He switches to a standalone building with no clubhouse (20% loading) where a 1,800 sq ft Super Built-up area gives him a massive 1,500 sq ft of actual living space for the same price.
Frequently Asked Questions
What is the difference between Carpet Area and Super Built-up Area?
Carpet Area is the actual usable floor space inside the apartment. Super Built-up Area includes the carpet area plus a proportionate share of common areas like lobbies, lifts, and staircases.
What is RERA Carpet Area?
Under the RERA act, Carpet Area is strictly defined as the net usable floor area of an apartment, excluding the area covered by external walls, services shafts, exclusive balcony, and open terrace area, but including the area covered by internal partition walls.
What is the loading factor?
Loading factor is the percentage of space added to the carpet area to arrive at the super built-up area. It typically ranges from 25% to 40% depending on the amenities provided by the builder.
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