Construction & DIY

Room Area Calculator

Measure a room once and get square feet, square meters and perimeter.

By TheCalcTools Updated Formula checked and tested

Your numbers

Your results

Area (sq ft)
Area (sq ft)
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Area (sq m)
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Area (sq yd)
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Perimeter of main section (ft)
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Room Area Calculator by TheCalcTools

How the Room Area Calculator works

Measure the main rectangle of the room, then any extra rectangle for an L-shape.

Choose feet or meters.

Total area is the sum of the rectangles; results are shown in common units.

The formula

Area = length × width (summed over sections)Perimeter of a rectangle = 2 × (length + width)

Worked example

Using the default values shown in the calculator:

Main section length14
Main section width12
Extra section length (optional)0
Extra section width (optional)0
Measured inFeet
  1. 14 × 12 = 168.0 sq ft = 15.61 sq m.
  2. That is 18.67 sq yd; the main section perimeter is 52.0 ft.

Result:

Area (sq ft)168.0
Area (sq m)15.61
Area (sq yd)18.67
Perimeter of main section (ft)52.0

Frequently asked questions

How do I measure an L-shaped room?

Split it into two rectangles, measure each and add the areas. Use the extra section fields for the second one.

Do I include closets and alcoves?

Include them if you will cover them with flooring. Leave them out of living-space figures.

Sources and further reading

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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.