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Carpet, Built-up & Super Built-up Area Calculator
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This calculator converts between the three area figures commonly quoted for apartments and flats — carpet area (the actual usable floor area within walls), built-up area (carpet area plus the thickness of walls and balconies), and super built-up area (built-up area plus a proportional share of common areas like lobbies, stairwells, and lifts). Real estate listings often lead with the larger super built-up figure, so knowing the actual carpet area — and the resulting carpet area efficiency percentage — is essential for comparing properties fairly. Choose which figure you know, enter it along with the wall and common-area loading percentages (adjustable to match your specific building), and get all three figures at once. Everything runs locally in your browser. Scroll down to enter your numbers.
Features
- Converts between carpet, built-up, and super built-up area in either direction
- Shows carpet area efficiency percentage
- Adjustable loading percentages to match your building
- Instant recalculation as you change inputs
Why use this carpet, built-up & super built-up area calculator?
- Makes property comparisons fairer and more transparent
- No manual percentage math required
- Fully private — nothing uploaded
- Free with unlimited use
Frequently asked questions
What's the difference between carpet area and built-up area?
Carpet area is the actual usable floor space within the walls (where you could lay a carpet); built-up area adds the thickness of the walls themselves plus balconies, typically 10-20% more than carpet area.
What is super built-up area?
Super built-up area (also called saleable area) adds a proportional share of common building areas — lobbies, stairwells, lifts, corridors — on top of built-up area, typically another 15-25% more.
Why do developers quote super built-up area?
It results in a larger number and a lower effective price-per-square-foot figure, which is why comparing the actual carpet area (and price per carpet-area square foot) gives a more accurate cost comparison.
What's a typical carpet area efficiency?
Efficiency (carpet area ÷ super built-up area) commonly falls between 65-75% for apartments, though it varies significantly by building design and developer.
Do loading percentages vary by building?
Yes, this calculator's default 10% wall loading and 20% common area loading are typical starting points — check your specific project's sale agreement or RERA disclosure for exact figures.