How do I calculate the area of a room?

Measure length and width in feet or meters, then multiply them. Area = Length × Width. For irregular shapes, break the room into rectangles and add the areas.

Carpet area is the net usable floor area inside the walls of an apartment. It excludes walls, balconies, and common areas. RERA mandates that developers disclose carpet area.

How is super built-up area calculated?

Super built-up area = Built-up area + Proportionate common area. The loading factor (usually 25-35%) is applied to carpet area to arrive at super area.

What is the difference between RERA carpet area and usable area?

RERA carpet area includes the area enclosed by walls (up to the inner face). Usable area may exclude some wall portions. RERA definition is more generous than the older 'carpet area' standard.

Carpet Area Calculator India | RERA Super Built-up vs Carpet Area

Enter Property Details

Super Built-up Area (Sq. Ft.)Total area advertised by builder

Loading Factor (%)

30%

Standard loading is 25-35%

Area Breakdown

ESTIMATED CARPET AREA (Usable Space)

700 Sq. Ft.

This is the actual area you can use within the walls.

BUILT-UP AREA (Approx)

805 Sq. Ft.

Includes walls & balconies

COMMON AREA (Loading)

300 Sq. Ft.

Lobby, stairs, lift, etc.

Understanding the Terms

Carpet Area

The area enclosed within the walls, actual usable floor area. According to RERA, it excludes external walls, service shafts, balconies, and open terraces.

Built-up Area

Carpet Area + Area of walls + Area of balconies. This is typically 10-15% more than the carpet area.

Super Built-up Area

Built-up Area + Proportionate share of common areas (lobby, lifts, stairs, amenities). This is what you usually pay for.

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