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Carpet Area Calculator

Built-up area = carpet area + walls and balcony (typically +10–20%); super built-up = built-up + loading for common areas (typically 20–40%). A 1,000 ft² carpet area with 10% walls and 25% loading is 1,100 ft² built-up and 1,375 ft² super built-up: you use 72.7% of what you pay for.

Inputs

Results update as you type.

Area
ft²
Percentages
Area comparisonCarpet, built-up and super built-upSuper built-up area: 1375Built-up area: 1100Carpet area: 1000myconstructioncalculator.com
Diagram updates as you type.

Results

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Super built-up area
1,375.0ft² · 127.7 m²
Carpet area1,000.0 ft² · 92.9 m²
Built-up area1,100.0 ft² · 102.2 m²
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Working
  1. Built-up = carpet × (1 + 10.0%) → 1,100.0 ft² (102.2 m²)
  2. Super built-up = built-up × (1 + 25.0%) → 1,375.0 ft² (127.7 m²)
  3. Carpet = super built-up ÷ (1.100 × 1.250) → 1,000.0 ft² (92.9 m²)
  4. Usable share of super built-up = 72.7%
Results are estimates for planning and material ordering only. They are not a substitute for structural design or approval by a qualified engineer. Read the full disclaimer.
Formulas


Built-up area        = Carpet area × (1 + wall & balcony %)
Super built-up area  = Built-up area × (1 + loading %)
Carpet area          = Super built-up ÷ ((1 + wall %) × (1 + loading %))


Worked Example


A flat with 1,000 ft² carpet area, 10% for walls and balcony, 25% loading:


    

  1. Built-up = 1,000 × 1.10 = 1,100 ft² (102.2 m²)
    2. 

  2. Super built-up = 1,100 × 1.25 = 1,375 ft² (127.7 m²)
    3. 

  3. Usable share = 1,000 ÷ 1,375 = 72.7%
    4. 



If the price is quoted per ft² of super built-up area, the real price per usable ft² is 1.375 times higher.


How Much of the Super Built-Up Area Is Usable? (10% walls)






Loading
Carpet ÷ super built-up






20%
75.8%




25%
72.7%




30%
69.9%




35%
67.3%




40%
64.9%






Assumptions


    

  • Percentages are developer- and building-specific; use the figures in your agreement where possible.
    • 

  • 1 m² = 10.764 ft². Results are shown in both units.
    • 



Frequently Asked Questions
What is carpet area?
The usable floor area inside the walls of a flat: the area you could cover with a carpet. Under India's RERA Act it includes internal partition walls but excludes external walls, balconies, verandahs and terraces.
What is the difference between built-up and super built-up area?
Built-up area adds the thickness of walls and the balcony to the carpet area. Super built-up area also adds your proportional share of common areas such as the lobby, stairs, lifts, corridors and clubhouse.
How do I calculate carpet area from super built-up area?
Divide by (1 + loading %) and then by (1 + wall %). 1,375 ft² ÷ 1.25 ÷ 1.10 = 1,000 ft² carpet area.
What is a typical loading factor?
Often 20–30% for mid-rise buildings and 30–40% for towers with many amenities. Ask the developer for the exact carpet area: RERA requires it in India.
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