Room Square Footage
Find the total square footage of an L-shaped or irregular room.
About Room Square Footage
An L-shaped room splits into two rectangles whose areas are each length times width. Adding the two rectangles gives the occupant's usable floor area. Accurate square footage drives flooring, painting and even real-estate value statements, so breaking odd rooms into rectangles is the reliable method.
Formula
Room Square Footage
Area = length x width for each rectangle, then add sections
- sections
- Rectangular parts of an L-shaped room
Worked example
With the default values below, Room Square Footage returns Main Section Area of 120.0. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Main section lengthminimum 0 ft
- 12 ft
- Main section widthminimum 0 ft
- 10 ft
- Extra section lengthminimum 0 ft
- 6 ft
- Extra section widthminimum 0 ft
- 8 ft
Results
- Main Section Area
- 120.0 sq ft
- Extra Section Area
- 48.0 sq ft
- Total Area
- 168.0 sq ft
- Total Area (m²)
- 15.61 m²
Step by step
- 1Values used
- 2Room Square Footage
- 3Main Section Area= 120.0 sq ft
- 4Extra Section Area= 48.0 sq ft
- 5Total Area= 168.0 sq ft
- 6Total Area (m²)= 15.61 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, fees or charges 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
How is Room Square Footage calculated?
Area = length x width for each rectangle, then add sections An L-shaped room splits into two rectangles whose areas are each length times width. Adding the two rectangles gives the occupant's usable floor area.
Why does Room Square Footage matter?
Accurate square footage drives flooring, painting and even real-estate value statements, so breaking odd rooms into rectangles is the reliable method.
What values do I need to enter?
This calculator takes 4 inputs: Main section length, Main section width, Extra section length, Extra section width. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.