FSI and FAR calculator: permissible built-up area from plot size
At 1.33 FSI, a 5,000 sq ft plot allows 6,650 sq ft of built-up area.
Multiplies plot area by the floor space index, then estimates footprint and floors from ground coverage, with indicative base FSI for major Indian cities.
How it is worked out: built-up = plot x FSI x (1 + premium), floors = built-up / (plot x coverage)
Indicative figures, last updated 10 September 2026. Check them against the local source before relying on them.
Questions people ask
Is FSI the same as FAR?
Yes. Mumbai and Pune say FSI, Delhi, Bengaluru and Gurugram say FAR, sometimes as a percentage. 1.5 FSI and 150% FAR are the same thing.
Why is my permissible area lower than the builder says?
Base FSI is only the start. Premium FSI bought from the authority, TDR, fungible area and incentives for specific schemes add to it. Enter the extra as a percentage under assumptions.
Does FSI include balconies and parking?
It depends on the local rules. Most authorities leave parking out, some count enclosed balconies, and premium or fungible FSI is bought separately. Check the development control regulations for the plot before relying on a figure.
Common values
| City | Base FSI | Buildable on a 5,000 sq ft plot |
|---|---|---|
| Mumbai island city | 1.33 | 6,650 sq ft |
| Mumbai suburbs | 1.00 | 5,000 sq ft |
| Pune | 1.10 | 5,500 sq ft |
| Delhi | 1.20 | 6,000 sq ft |
| Chennai | 1.50 | 7,500 sq ft |
| Kolkata | 1.75 | 8,750 sq ft |
| Bengaluru | 1.75 | 8,750 sq ft |
| Gurugram | 1.75 | 8,750 sq ft |
| Ahmedabad | 1.80 | 9,000 sq ft |
| Noida | 2.00 | 10,000 sq ft |
| Hyderabad | 2.00 | 10,000 sq ft |
Built by 256 GRAYS, an interior architecture and 3D visualisation studio in Mumbai.