Everything about The Acre totally explained
The
acre is a
unit of
area in a number of different systems, including the
imperial and
U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre.
One international acre is equal 4046.8564224
m2. One U.S. survey acre is equal to = 4046.8726098 m
2.
One acre comprises 4,840
square yards or 43,560
square feet (which can be easily remembered as 44,000 square feet, less 1%). Because of alternative definitions of a yard or a foot, the exact size of an acre also varies slightly. Originally, an acre was a
selion of land one
furlong long and one
chain wide. However, an acre is a measure of area, and has no particular width, length or shape.
The acre is often used to express areas of land. In the
metric system, the
hectare is commonly used for the same purpose. An acre is approximately 40% of a hectare.
One acre is 90.75 yards of a 53.33-yard-wide
American football field. The full field, including the end zones, covers approximately 1.32 acres.
International acre
In 1958, the
United States and countries of the
Commonwealth of Nations defined the length of the international
yard to be 0.9144
meters. Consequently, the international acre is exactly 4046.8564224
square meters.
United States survey acre
The United States survey acre is approximately 4046.873
square meters; its exact value (m²) is based on an inch defined by 1 meter = 39.37 inches exactly, as established by the
Mendenhall Order. It is the standard acre in the
United States, but the fractional difference from the international acre is only 40 millionths, or 4 ten-thousandths of one percent.
Equivalence to other units of area
1 international acre is equal to the following metric units:
1 United States survey acre is equal to:
4046.87261 square meters
0.404687261 hectare
1 acre (both variants) is equal to the following customary units:
66 feet × 660 feet (43,560 square feet)
4840 square yards
160 perches. A perch is equal to a square rod (1 square rod is 0.00625 acre)
10 square chains
4 roods
A chain by a furlong (chain 22 yards, furlong 220 yards)
0.0015625 square mile (1 square mile is equal to 640 acres)
1 international acre is equal to the following Indian unit:
100 Indian cents (1 cent is equal to 0.01 acre)
Historical origin
The word "acre" is derived from Old English æcer (originally meaning "open field", cognate to Swedish "åker", German Acker, Latin ager and Greek αγρος (agros).
The acre was approximately the amount of land tillable by one man behind an ox in one day. This explains one definition as the area of a rectangle with sides of length one chain and one furlong. A long narrow strip of land is more efficient to plough than a square plot, since the plough doesn't have to be turned so often. The word "furlong" itself derives from the fact that it's one furrow long.
Before the enactment of the metric system, many countries in Europe used their own official acres. These were differently sized in different countries, for instance, the historical French acre was 4221 square metres, whereas in Germany as many variants of "acre" existed as there were German states.
Statutory values for the acre were enacted in England by acts of:
Edward I,
Edward III,
Henry VIII,
George IV and
Victoria – the British Weights and Measures Act of 1878 defined it as containing 4,840 square yards.
Historically, the size of farms and landed estates in the United Kingdom was usually expressed in acres (or acres, roods, and perches), even if the number of acres was so large that it might conveniently have been expressed in square miles. For example, a certain landowner might have been said to own 32,000 acres of land, not 50 square miles of land.
Customary acre
The customary acre was a measure of roughly similar size to the acre described above, but was subject to considerable local variation. However, there were more ancient measures that were also used, including carucates, virgates, bovates, nooks, and farundells or farthingales. These may have been multiples of the customary acre, rather than the statute acre.
Other acres
Scottish acre, one of a number of obsolete Scottish units of measurement
Irish acreFurther Information
Get more info on 'Acre'.
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