Floor Area Ratio (FAR) Calculator
Calculate the maximum buildable area, per-floor area, and ground coverage based on your plot size and permitted FAR.
* All calculations are approximate.
How Floor Area Ratio Calculator Works?
Calculate the maximum buildable area, per-floor area, and ground coverage based on your plot size and permitted FAR.
Enter your plot area in square feet, select the permitted FAR value, and specify the number of floors planned.
Maximum buildable area is calculated as Plot Area x FAR.
Area per floor is derived by dividing the maximum buildable area by the number of floors planned.
Remaining open ground area is calculated as Plot Area minus the per-floor area (building footprint).
Ground coverage percentage shows what fraction of the plot is covered by the building footprint.
Formula Used
Max Buildable Area = Plot Area x FAR; Area per Floor = Max Buildable Area / Number of Floors; Remaining Area = Plot Area - Area per Floor; Ground Coverage = (Area per Floor / Plot Area) x 100
FAR limits vary by city and zone. Always verify the applicable FAR with your local municipal authority before finalizing building plans. Basements and parking may be excluded from FAR calculations depending on local bylaws.
Important — Read Before You Decide
- Floor Area Ratio (FAR) is the ratio of total built-up area to the total plot area, and is regulated by local municipal authorities.
- FAR limits vary significantly across Indian cities — Delhi allows up to 3.5 in some zones, while Bangalore typically permits 1.75 to 3.25.
- Permitted FAR may include premium FAR that can be purchased by paying additional charges to the municipal corporation.
- Basements, parking areas, and utility rooms are often excluded from FAR calculations depending on local building bylaws.
- FAR violations can result in demolition orders, heavy fines, and inability to obtain occupancy certificates.
- Some cities offer additional FAR incentives for green buildings, affordable housing, or transit-oriented developments.
- Always verify the applicable FAR with the local development authority before finalizing your building plan.
What Happens If You Ignore These?
- Exceeding the permitted FAR can lead to demolition notices and legal action by the municipal corporation.
- Underutilizing allowed FAR means losing potential built-up area that could add value to your property.
- Ignoring ground coverage limits can result in insufficient open space, ventilation, and natural light.
- Building without verifying current FAR regulations may lead to rejection of building plan approval.
- Incorrect FAR calculations can cause disputes with neighbors over setback and height violations.
Smart Tips
- Check your city's latest development control regulations for the most current FAR limits before planning.
- Factor in mandatory setbacks and margins when calculating actual usable floor area per level.
- Consider purchasing premium FAR if available in your city to maximize your built-up area legally.
- Keep ground coverage below the permitted limit to ensure adequate open space and avoid regulatory issues.
- Consult a licensed architect to optimize your floor plan within the permitted FAR for maximum usable space.
Frequently Asked Questions
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