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Real Estate Calculators

Carpet to Built-up Area Calculator

Verified formula Updated Jun 2026 Private — runs on your device

Enter details
sq ft
%
Verified formula Private

Built-up / super built-up area

1,428.57

For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.

How to use the Carpet to Built-up Area Calculator

The Carpet to Built-up Area Calculator works out your built-up / super built-up area in an instant. Enter carpet area and loading factor and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.

  1. Enter the carpet area.
  2. Enter the loading factor.
  3. Read off your built-up / super built-up area — the calculator updates automatically, with no button to press.

Formula

The Carpet to Built-up Area Calculator uses the formula:

Built-up / super built-up area = Carpet area ÷ (1 - Loading factor ÷ 100)

Worked example

For example, with carpet area of 1,000 sq ft and loading factor of 3%, the built-up / super built-up area is 1,428.57.

Inputs used
Carpet area 1,000 sq ft
Loading factor 3%
Results
Built-up / super built-up area 1,428.57

Results are estimates for educational use, not professional advice.

Key terms explained

Area
The amount of two-dimensional space a shape covers, measured in square units.

Frequently asked questions

Divide carpet area by (1 − loading factor). 1,000 sq ft carpet at 30% loading is about 1,429 sq ft built-up.

It is the share added for walls, lobbies and common areas, often 20 to 40%.

It is the usable floor area within the walls, the space you can actually lay carpet on.

Prices are often quoted on built-up area, so knowing the carpet area shows the real usable space.

The Carpet to Built-up Area Calculator uses the formula: Built-up / super built-up area = Carpet area ÷ (1 - Loading factor ÷ 100). For example, with carpet area of 1,000 sq ft and loading factor of 3%, the built-up / super built-up area is 1,428.57.

Enter the carpet area. Enter the loading factor. Read off your built-up / super built-up area — the calculator updates automatically, with no button to press.

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