Room Area Calculator
Calculate the area of a room in square feet and square metres. Add extra areas for L-shaped rooms.
Room area calculator
How it is calculated
Room area is length times width. For an L-shaped or odd room, split it into rectangles, work out each one, then add them together.
Area = length × widthExample: a 12 ft × 15 ft room is 12 × 15 = 180 sq ft (16.7 m²). With 10% extra for cuts, buy 198 sq ft of flooring.
Measuring in feet and inches? Convert with the decimal feet calculator first.
Common questions
How do I find the square footage of a room?
Measure the length and width in feet and multiply them. A 10 × 12 ft room is 120 sq ft. For an L-shaped room, measure each rectangle separately and add the totals.
How many square feet are in a square yard?
There are 9 square feet in a square yard (3 ft × 3 ft). Carpet is often sold by the square yard, so divide square feet by 9.
How much extra flooring should I buy?
Most installers suggest about 10% extra for cuts and mistakes, and 15% for diagonal or patterned layouts.