Building Floor Size Calculator

FSR Formula:

\[ FSR = \frac{\text{Total Floor Area}}{\text{Site Area}} \]

Floor Space Ratio (FSR):

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1. What is Floor Space Ratio (FSR)?

Floor Space Ratio (FSR), also known as Floor Area Ratio (FAR), is a planning control used to regulate building density. It represents the relationship between the total floor area of a building and the size of the land upon which it is built.

2. How Does the Calculator Work?

The calculator uses the FSR formula:

\[ FSR = \frac{\text{Total Floor Area}}{\text{Site Area}} \]

Where:

Total Floor Area — Sum of all floor areas in the building (m²)
Site Area — Total area of the land parcel (m²)

Explanation: The FSR indicates how intensively a piece of land is being developed. A higher FSR means more floor area relative to the site size.

3. Importance of FSR Calculation

Details: FSR is crucial for urban planning, determining building density, ensuring adequate light and ventilation, and maintaining neighborhood character. It helps municipalities control development intensity and infrastructure requirements.

4. Using the Calculator

Tips: Enter both total floor area and site area in square meters. Both values must be positive numbers. The calculator will compute the FSR ratio.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical FSR value for residential areas?
A: Typical FSR values vary by location and zoning, but often range from 0.5 to 2.0 for residential areas, with higher values in dense urban centers.

Q2: Does FSR include underground areas like basements?
A: This varies by local regulations. Some jurisdictions exclude basement areas from FSR calculations, while others include them.

Q3: How does FSR differ from building coverage?
A: Building coverage refers to the percentage of land covered by the building footprint, while FSR considers the total floor area across all levels.

Q4: Can FSR be greater than 1?
A: Yes, an FSR greater than 1 indicates multiple floors. For example, an FSR of 2.0 could mean a two-story building covering the entire site or a taller building covering a smaller portion.

Q5: How do setbacks affect FSR calculations?
A: Setbacks reduce the potential building footprint but don't directly affect FSR calculation. They may limit how much of the allowable FSR can be utilized on a given site.