Square feet

Physical unit
Unit name	Square feet
Unit symbol	${\displaystyle \mathrm {sq\,ft} }$
Physical quantity (s)	surface
Formula symbol	${\displaystyle A}$
dimension	${\displaystyle {\mathsf {L^{2}}}}$
system	Anglo-American system of measurement
In SI units	${\displaystyle \mathrm {1\,sq\,ft=0{,}09290304\;m^{2}} }$
In CGS units	${\displaystyle \mathrm {1\,sq\,ft=929,0304\;cm^{2}} }$
Derived from	foot
See also: square inches

The square feet ( square foot , plural square feet ) is a square measure in the Anglo-American system of measurement , which in the US and in the UK is used. It was used as a historical measure in continental Europe until the introduction of the metric system.

A square is defined as a square area having an edge length of 1 foot (corresponding to ¹ / ₃  Yard , 12  inch (inches) or 0.3048 meters ). This corresponds to approx. 0.09 square meters .

Abbreviations

There is no generally accepted abbreviation for the unit. The following variants are in use:

• square feet, square foot, square ft
• sq feet, sq foot, sq ft, SF

More rarely also:

• feet / -2, foot / -2, ft / -2
• feet ^ 2, foot ^ 2, ft ^ 2
• feet², foot², ft²

In architectural drawings and in real estate trading, a square is also used as a symbol, which is divided by an oblique or vertical line.

conversion

1 square foot corresponds in the Anglo-American system of measurement:

• 144 square inch (square inches)
• 1/9 square yards
• 1/43560 (≈  0.000 022 956 84 ) acres
• 0.01 square

In the metric or international system of units (SI) :

• 92 903.04 square millimeters
• 929,030 4 square centimeters
• 0.092 903 04 square meters

Historic measure in continental Europe

Before the introduction of the metric system in the course of the 19th century, the square foot (abbr .: Qu.-F. or ◻ ') was also a common measure of area in continental Europe. It differed from country to country, depending on the different foot norms.

For example B .:

• 1 Bavarian Qu.-F. = 0.086475 m²
• 1 Prussian Qu.-F. = 0.098504 m²
• 1 Viennese Qu.-F. = 0.099921 m²
• 1 Parisian Qu.-F. = 0.105521 m²

In Bavaria, but occasionally also in other German regions, a distinction was made between ten and twelve-part square feet. The former was 100 square inches, the latter 144 square inches.

swell

1. ↑ Das Hauslexikon , Vol. VI, Breitkopf and Härtel, Leipzig 1837, p. 596.
2. ↑ Leopold Einsle: Systematic compilation of the most excellent European measures, weights and coins. Publishing house Jos. Kösel'sche Buchhandlung, Kempten 1846, p. 48.

See also

• Square mile