Square Feet Conversion

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Square Feet


sq ft


When describing architecture or real estate, the square foot is often symbolised as a square with a line or slash through it.

Unit of:


Wordwide use:

The square foot is used mainly in the United States, Canada and the United Kingdom as a measurement of area.


In metric terms a square foot is a square with sides 0.3048 metres in length. One square foot is the equivalent to 0.09290304 square metres.


The origin of the square foot as a unit of measurement can be traced back to ancient times but the specific origin of the square foot as a unit is not well-documented.

One theory suggests that the square foot measurement may have originated from the ancient Roman system of measurement. The Romans used a unit called the "pes," which was equivalent to approximately 11.65 inches. It is believed that the square foot may have been derived from the square of this unit, resulting in an area measurement of one square foot.

Another possibility is that the square foot measurement evolved from the practice of using the human foot as a unit of measurement. In ancient times, people often used their feet to measure distances and areas. It is likely that the square foot was derived from the area covered by a person's foot when placed side by side.

Common references:

The six floors of the White House (Washington D.C., U.S.A.) have a combined floor-space area of approximately 55,000 square feet.

In 2003 the average new-build house in the UK had a floor-plan of 818 ft², whereas a new-build house in the United States was on average nearly three times larger, with a floor-plan of 2,300 ft².

Usage context:

Square feet is a commonly used unit of measurement in various contexts, primarily in the field of real estate and construction. It is used to measure the area of a space or surface, providing a convenient way to determine the size or dimensions of a room, building, or piece of land. Square feet is particularly prevalent in countries like the United States, where it is the standard unit for measuring residential and commercial properties.

In the real estate industry, square feet is used to describe the size of houses, apartments, offices, and retail spaces. It helps potential buyers or renters understand the amount of usable space available and compare different properties. Real estate agents often include the square footage of a property in their listings to provide essential information to interested parties. Square feet is also widely used in the construction industry. Architects, engineers, and contractors rely on this unit to calculate the amount of materials needed for a project, estimate costs, and plan the layout of a building. It allows them to determine the size of rooms, the amount of flooring or paint required, and the capacity of a space.