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Room Area Calculator

Calculate floor, wall and ceiling areas for any room — essential before buying flooring, paint, tiles or carpet. Handles rectangular rooms and odd shapes.

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Enter your room dimensions to calculate floor, wall and ceiling areas.

Measure precisely. A laser distance measurer is far more accurate than a tape measure for room dimensions — essential for larger rooms.

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Room Area Calculations

Floor area = length × width. Wall area = perimeter × height, minus doors and windows. Ceiling area = same as floor area. These measurements are the starting point for every decorating and flooring calculation — getting them right upfront saves significant time and money.

Divide the L-shape into two rectangles. Calculate each rectangle separately (length × width), then add the two floor areas together. For walls, measure each wall segment individually and sum them to get total perimeter. Do this for each rectangle and add the two wall totals, being careful not to double-count shared interior walls.
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