Floor Area Ratio Calculator

Floor Area Ratio (FAR) is the ratio of total gross floor area of a building to the total area of the plot on which it is constructed. It indicates the building density and is used by planning authorities to regulate development.

FAR is calculated by dividing the total gross floor area of all floors by the total plot area. For example, if a building has 2,500 sq ft of floor area on a 1,000 sq ft plot, the FAR is 2.5.

Carpet area is the usable floor space that can be covered with carpet, excluding walls and common areas. Built-up area includes carpet area plus the area occupied by walls and internal structures.

Super built-up area includes built-up area plus a proportionate share of common areas like lobbies, corridors, elevators, and amenities. It represents the total area you pay for when buying a property.

FAR determines how much construction is allowed on a plot. Higher FAR allows more floor space, increasing development potential and property value. It helps developers understand zoning regulations and maximum buildable area.

Floor Space Index (FSI) is another term for Floor Area Ratio (FAR). Both represent the same concept - the ratio of total built-up area to the plot area. Different regions may use different terminology.

Loading factor is the percentage of common area added to carpet area. It typically ranges from 15-30%. Super built-up area can be calculated as carpet area multiplied by (1 + loading factor percentage).

Open Space Ratio (OSR) is the percentage of plot area that remains open and unbuilt. It's calculated as (Plot Area - Built-up Area) / Plot Area × 100. Higher OSR indicates more open space around the building.