# Acre (unit)

 symbol A., AC. surface (A) 4046.8564224 m ²

acres [ˈeɪkə] (English) a non is SI-UNIT of the surface. The unit symbol is A. - not to confound with A (without point), the symbol of the surface A.

Acre was specified as the area of arable land, the one man with an ox on one day to till could (see to morning (unit)). Since this may appear very variable, acre was redefined. The surfaces became in England of Edward I., Edward III., Heinrich VIII. and George IV. legally embodies and in the colonies (Commonwealth) including the USA taken over. In the British Weights and Measures act of 1878 was defined it with 4.840 square yards.

Itonly field is not related from the linguistic origin to the old German unit, which measured regionally differently from approximately 19 to 65 acre.

## to definition

1 A.
= 4 ro. = 4,840 yd.² = ² 1 square mile =

640 acre [ work on] of approximate values

1 acre =

## 4

,046 m ² 1 acre corresponds to 4,046

, 8564224 m thereby to oneSquare of the side length 63.60 m × 63.60 M.

3 acres is thus somewhat more than 1 hectare (a square of 100 m × 100 m).

While 1 hectare = 10,000 m are ², 3 acre = 12 is,140 m ².

The approximate value 1 hectare = 2.5 is still more exact acres. (2.5 acres = 10,117 m ²).

## British definition

in the united kingdom defines the regulation “unit OF Measurement regularization” (of 1995)

1 acre = 4,046, 8564224 m ².

That is gel-calibrationimportantly with

1 acre = 43,560 ft ² (square foot or - on German somewhat uncommonly - square foot).

That means approx. 1 acre = 208.71 ft x 208.71 ft.

## US definition

the US-American standardisation authority „national institutes OF standardand Technology “(NIST) defined acre in relation to ft ² (square foot):

1 acre = 43,560 ft ² - that is actually identical to the British definition.

However there are two definitions for foot in the USA - all all thisdeviate only by 0,000 000,609 m from each other. The international foot is 0.3048 m long, during which nearly unknown US land surveyor foot (survey foot) is longer around 0.000609 mm. (One finds a short explanation in addition under:Foot)

based on it gives itin the USA two acre mass, which deviate minimum from each other:

• 1 internationally acre = 4,046, 8564224 m ².
• 1 US land surveyor acre = 4,046, 87261 m ².

In the USA acre is absolutely common as square measure. With property purchases almost exclusively on acres, also that is countedPrice of land is then indicated as US\$ per acre. That applies also to the purchase of a small private property. Likewise all farmers count on acres.

## exotic units

the square measure acre historically seen on the basis of at that time most modern“Machine” - the Ochsengespann - imported. From the origin parallels result to horse power. Since turning of the plow with the Ochsengespann was laborious, the farmer did not plow accurately square fields, but somewhat elongated fields. The extreme solution would be oneonly furrow been, but then could have too strongly clean-grown weeds from the sides. Thus the farmer optimized empirically aspect ratio.

The pertinent longitudinal dimensions, with which the square measure acre korelliert, are

• the chain (chain - thatLongitudinal dimension for the width of the field) and
• the Furlong (furrow length - the longitudinal dimension for the length that of field).

The chain is based on the length of the “Messkette” of the land surveyor.

1 chain = 20.1168 m = 66 ft. The relationship with the square measureAcre is: 1 chain = 1 acre width - this unit of length came also in the USA except use.

1 Furlong = 10 chain = 201.168 m = 660 ft. The relationship with the square measure acre is: 1 Furlong = 1 acre length- also this unit of length came in the USA except use.

The farmer has his field thus on aspect ratio 1: 10 optimizes.

1 acre = 1 chain × 10 chain = 1 chain × 1 Furlong

1 acre= 66 ft × 660 ft = 43,560 ft ² (that is exactly the official British and US definition for 1 acre).

1 acre = 20.1168 m × 201.168 m = 4,046, 856422 (also correspond exactly to the above relationship acre to square meter)

Still exotically the longitudinal dimensions are Rod and left:

• Rod (English: Rod) is the length of a “ox prick stick”. This rod had a length of 5,0292 M.
• Left (English: Track link) is the dog first part a land surveyor chain (chain). A left (ring of the land surveyor chain -Chain) was 20.1168 cm long.

1 chain = 4 Rod = 1 acre width

1 chain = 100 left = 1 acre width = 66 ft. = 20.1168 meters

the whole can be added also integral to to statute the Mile:

1 statute mile= 8 furlong = 80 chain = 320 rod = 8000 left

## conversions

1 acre =

• 4,046, 8564224 m ²
• 0.40468564224 hectars
• of 43,560 ft ²
• 4,840 square yards
• 1/640 square miles (640 acres = 1 square mile)
• rectangle (aspect ratio 1:10)66 ft × 660 = 1 chain ft × 1 Furlong
• approx. a square of the side length 63.61 m
• approx. a square of the side length 208.71 ft

far conversions:

• 40 acres = a square of the side length 1/4 statute mile.
• 160 acres =a square of the side length 1/2 statute mile. (160 acres were the usual granted surface of the Homestead Acts of 1862 with settling the American west.)
• 1 acre = a rectangle 1/2 statute mile × 1 Rod (1 Rod = 5.0292to m)