FSI Calculator.
Calculate permissible built-up area (FSI/FAR) based on road width, plot area, and city-specific Development Control Regulations (DCR).
Zonal Authority
Building Params
Development Potential
Calculated based on max ground coverage of 35%. Individual floor height assumed 3m.
Coverage Audit
Technical Advisory
FSI of 1.4300000000000002 is subject to local amenity space and open margin requirements per MUMBAI DCR. Always refer to statutory planning guidelines before finalizing architectural projects.
What is FSI & FAR Calculator for Indian Cities?
Understanding FSI (Floor Space Index) and FAR (Floor Area Ratio)
Floor Space Index (FSI), also known as Floor Area Ratio (FAR), is the ratio between the total built-up area of a building and the actual area of the plot on which the building is constructed. This metric is the primary tool used by urban planning authorities in India—such as BMC (Mumbai), DDA (Delhi), and BDA (Bangalore)—to control the density of development in specific zones.
For architects and developers, calculating the correct FSI is the first step in any feasibility study. A road width of 9 meters might allow a base FSI of 1.0, while an 18-meter road could unlock premium FSI or TDR (Transferable Development Rights) up to 2.5 or higher.
How to Calculate Permissible Built-up Area
The formula for FSI calculation is straightforward:
However, the "Permissible FSI" is often composed of multiple components:
- Base FSI: The standard entitlement given for the zone (Free).
- Premium FSI: Additional FSI that can be purchased from the municipal corporation by paying a premium.
- TDR: Rights generated from other plots (like slum redevelopment or public reservations) that can be utilized on your plot.
- Fungible FSI: In cities like Mumbai, additional area allowed (usually 35% for residential) to compensate for balconies and niches that were previously "free of FSI".
City-Specific Variations in India
| City | Authority | Typical FSI Policy |
|---|---|---|
| Mumbai | MCGM / BMC | Complex tier-based FSI based on Road Width (DCPR 2034). |
| Delhi | DDA | High FAR (up to 3.5-4.0) for redevelopment and transit-oriented zones. |
| Pune | PMC / PCMC | Unified DCPR for Maharashtra with standardized FSI norms. |
More on FSI & Premium Entitlements
Beyond the base FSI, most Indian cities allow for "Premium FSI" or "Compensatory FSI". For example, in Chennai, premium FSI can be obtained by paying 50% of the guideline value of the land for the additional area.
TDR (Transferable Development Rights)
TDR is a way to make the development potential of one plot available on another. It is often generated when the government acquires land for roads or parks.
Fungible FSI
In Mumbai, homeowners can pay a premium to the BMC to build an extra 35% of the carpet area, which can be used for larger rooms or additional decks.
How can NiyamX help beyond FSI?
Calculating FSI is just the beginning. NiyamX provides a full suite of compliance automation tools:
- Automated NBC 2016 Checks
- City-Specific DCR Verification
- 3D Setback Visualization
- One-Click Compliance Reports
Common Mistakes in FSI Calculations
- Ignoring the "Net Plot Area" (Plot area minus road widening or reservations).
- Not checking the latest DCR notifications (FSI rules change frequently via Gazettes).
- Failure to account for Mandatory Open Spaces (MOS) which might limit your footprint regardless of high FSI.
- Mismatching the Occupancy Type (Commercial FSI is often different from Residential).
Deep Dive: Unified DCR Strategy
Designing in Maharashtra?
The Unified DCR regulations have introduced complex "Road Width Multipliers" that can double your FSI potential if navigated correctly.
Master Unified DCR →VASTU AI SUITE
SACRED GEOMETRY.
Audit your floor plans using our phase-3 16-zone Shakti Engine. Get real-time energy maps, scientific remedies, and detailed botanical suite recommendations.
16-Zone Shakti
Precision grid mapping & Brahmasthan help
Botanical Suite
200+ specialized plant remedies
3D VR Energy
Interactive Three.js energy visualization
Shastra Citations
RAG-powered classical text verification
Authorized Vastu Methodology for Modern Architecture
How to Calculate FSI for a Plot
A step-by-step guide to calculating the permissible built-up area (FSI) for residential and commercial plots in India.
Determine Plot Area
Identify Road Width
Check Zone Regulations
Calculate Permissible Area
Technical FAQ & Regulatory Compliance
1Is balcony area included in FSI?
2What is the difference between FSI and FAR?
3Does FSI include the basement area?
Related Free Tools
Building Plan Audit
Automated building plan check against NBC 2016 and local city bypass.
Compliance Chat
Smart AI assistant to find building rules and answers quickly.
Stair Calculator
Design perfect stairs and steps as per NBC rules with comfort check
Need specific municipal DCR data?
Get real-time updates for 100+ cities in India with NiyamX Enterprise.