Carpet area to built-up and super built-up area calculator (RERA)
At 30% loading, 1,000 sq ft of carpet area is sold as 1,300 sq ft of super built-up area.
Turns any one of carpet, built-up or super built-up area into the other two using a loading percentage, and shows what a quoted rate really costs per sq ft of carpet.
How it is worked out: super built-up = carpet x (1 + loading), built-up = carpet x (1 + wall allowance)
Indicative figures, last updated 10 September 2026. Check them against the local source before relying on them.
Questions people ask
What is RERA carpet area?
The net usable floor area inside the apartment, including internal partition walls but excluding external walls, service shafts, balconies and open terraces.
What is loading?
The percentage added to carpet area to arrive at super built-up area, covering shared spaces like lobbies, staircases and lifts.
Why check the effective rate on carpet?
Two flats at the same rate per sq ft of super built-up can cost very different amounts per sq ft of carpet if their loading differs.
Common values
| City | Typical loading | 1,000 sq ft carpet sells as |
|---|---|---|
| Mumbai | 35% | 1,350 sq ft |
| Thane | 35% | 1,350 sq ft |
| Delhi NCR | 30% | 1,300 sq ft |
| Pune | 30% | 1,300 sq ft |
| Kolkata | 30% | 1,300 sq ft |
| Bengaluru | 25% | 1,250 sq ft |
| Hyderabad | 25% | 1,250 sq ft |
| Chennai | 25% | 1,250 sq ft |
| Coimbatore | 20% | 1,200 sq ft |
Built by 256 GRAYS, an interior architecture and 3D visualisation studio in Mumbai.