Carpet Area vs Built Up Area Calculator

Work out carpet area vs built up area instantly with clear inputs, formula shown and shareable results.

About Carpet Area vs Built Up Area Calculator

Carpet area is the usable floor you can actually lay carpet on, built-up area adds walls and balconies, and super built-up adds a share of lifts, lobbies and amenities. The carpet-to-super-built-up ratio is typically 65-75%, and it is the only honest basis for comparing quoted prices.

Formula

Area definitions

carpet = built-up x (1 - wall share) - balcony allowance; super built-up = built-up x (1 + loading)

Worked example

With the default values below, Carpet Area vs Built Up Area Calculator returns Carpet area of 1,016.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Built-up area: 1,200 ft²
Wall and structure share: 12 %
Balcony and terrace: 80 ft²
Super built-up loading: 25 %

Results

Carpet area: 1,016.00 ft²
Super built-up area: 1,500.00 ft²
Carpet to super built-up ratio: 67.73% %
Carpet area: 94.39 m²

Step by step

1Values used
2Area definitions
3Carpet area= 1,016.00 ft²
4Super built-up area= 1,500.00 ft²
5Carpet to super built-up ratio= 67.73 %
6Carpet area= 94.39 m²

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Which area should I compare prices on?

Carpet area. Loading factors vary between developers, so a lower price per super built-up foot can be worse value per usable foot.

What loading factor is normal?

20-30% is common; above 40% suggests very generous common areas or an aggressive sales practice. Many jurisdictions now require carpet area disclosure.