Use this square footage calculator to work out the floor area of a room or a whole floor plan. Measure each rectangular part of the space, enter its length and width in feet and inches, decimal feet, or metres, and add as many sections as you need for an L-shaped or irregular room. The calculator shows the total in square feet, square meters, and square yards, with a breakdown for each section. The default room, 12 ft 6 in × 10 ft plus a 4 ft 3 in × 3 ft nook, is 137.75 sq ft (12.80 sq m, 15.31 sq yd). This is an everyday area estimate only, not a professional survey or appraisal measurement.
The area of a rectangle is length × width. In the feet modes, inches are turned into feet first by dividing by 12, so 12 ft 6 in is 12.5 ft. Each section's area in square feet is its length in feet times its width in feet. Square meters are square feet × 0.09290304, because one foot is exactly 0.3048 m and 0.3048 × 0.3048 = 0.09290304. Square yards are square feet ÷ 9, because a yard is 3 feet and 3 × 3 = 9. In metre mode the area is metres × metres, and square feet are square meters ÷ 0.09290304.
The total is the sum of the exact section areas. Every figure on the page is rounded half-up to two decimals from its own exact value, once. Because of that, rounded section figures can differ from the rounded total by 0.01. In the default room the sections show 11.61 and 1.18 sq m (which add to 12.79), while the exact total of 12.79739376 sq m displays as 12.80.
This calculator measures area only and adds no waste or overage. When you buy materials, use the flooring calculator or the tile calculator, which add a waste allowance and count boxes or tiles, or the paint calculator for walls.
Section 1 is 12 ft 6 in × 10 ft 0 in. Section 2 is 4 ft 3 in × 3 ft 0 in. 12 ft 6 in is 12.5 ft, so section 1 is 12.5 × 10 = 125 sq ft. 4 ft 3 in is 4.25 ft, so section 2 is 4.25 × 3 = 12.75 sq ft. The total is 125 + 12.75 = 137.75 sq ft. In square meters, 137.75 × 0.09290304 = 12.79739376, which displays as 12.80 sq m. In square yards, 137.75 ÷ 9 = 15.3055…, which displays as 15.31 sq yd. This is an everyday area estimate only, not a professional survey or appraisal measurement.
section sq ft = length (ft) × width (ft), where ft = feet + inches ÷ 12. sq m = sq ft × 0.09290304 (1 ft = 0.3048 m exactly, 0.3048² = 0.09290304). sq yd = sq ft ÷ 9 (1 yd = 3 ft, 3 × 3 = 9). metre mode: sq m = length (m) × width (m); sq ft = sq m ÷ 0.09290304. total = sum of the exact section areas; display = round2(exact), once
Everyday area estimate only, not a professional survey or appraisal measurement. This page multiplies the length and width you enter for each rectangular section, adds the exact section areas, and rounds each displayed figure half-up to two decimals. It adds no waste allowance; use the flooring or tile calculator for material quantities.
Measure the length and the width of the floor in feet and multiply them. A room 12 feet long and 10 feet wide is 12 × 10 = 120 square feet. If a measurement has inches, divide the inches by 12 and add them to the feet first: 12 ft 6 in is 12.5 ft, so 12 ft 6 in × 10 ft is 125 square feet.
Split the floor into rectangles that do not overlap, measure each one, and add a section for each. An L-shaped room with a 15 × 12 ft main area, an 8 × 6 ft leg, and a 5.5 × 4 ft alcove is 180 + 48 + 22 = 250 square feet. For a curved or angled part, measuring the smallest rectangle that encloses it gives a slightly larger figure, which is the safer side when you buy materials.
Multiply square feet by 0.09290304. That factor is exact, because one foot is exactly 0.3048 meters and 0.3048 × 0.3048 = 0.09290304. So 120 square feet is 11.1483648 square meters, shown as 11.15. To go the other way, divide square meters by 0.09290304: 14 square meters is about 150.69 square feet.
Nine. A yard is 3 feet, so a square yard is 3 ft × 3 ft = 9 square feet. Divide square feet by 9 to get square yards: 137.75 square feet is 15.31 square yards. Carpet and some flooring are still priced per square yard in the US.
Each figure is rounded to two decimals on its own, from its exact value. The total adds the exact section areas and is rounded once at the end. In the default example the sections show 11.61 and 1.18 square meters, which add to 12.79, but the exact total is 12.79739376 square meters, which rounds to 12.80. Adding already-rounded numbers would make the total less accurate.
Not on this page. It gives the measured floor area only. Flooring and tile are usually bought with some extra for cuts and breakage, and the right amount depends on the layout and the material. Use the flooring calculator or the tile calculator, which add a waste allowance and work out boxes or tiles.
Not necessarily. Listings and appraisals follow their own measuring standards, which can measure from exterior walls and include or exclude areas such as stairs, garages, or rooms with low ceilings. This tool multiplies the dimensions you enter. It is an everyday area estimate only, not a professional survey or appraisal measurement.