Unit ConversionAcre (ac or A)

a unit of area used for measuring real estate in English-speaking countries. Oneacre is equal to 0.404 687 3 hectare.

Acre foot (ac ft or af)a unit of volume used to measure the capacity of reservoirs. One acre foot is avolume one foot deep covering an area of one acre. Thus an acre foot contains 43560 cubic feet or about 1233.482 cubic meters (0.123 348 hectare meter).

Acre inch (ac in)a unit of volume equal (of course) to 1/12 acre foot. An acre inch contains 3630cubic feet, or about 102.7902 cubic meters.

Bagan old English unit of weight, varying with the contents of the bag but generallyin the range of 2-4 hundredweight (100-200 kilograms).

Bighaa traditional unit of land area in South Asia.The bigha varies in size from region to another; in India it is generally less than anacre (0.4 hectare).In Bengal (both in Bangladesh and in West Bengal, India) the bigha wasstandardized under British colonial rule (0.1338 hectare or 0.3306 acre); this isoften interpreted as being 1/3 acre.In central India bighas were standardized at 3025 square yards or 5/8 acre (0.2529hectare).In Nepal the bigha equals about 0.677 hectare (1.67 acres). The bigha was dividedinto 20 katthas, and each kattha contained 20 dhurs.

bushel (bu) [3]a commercial unit of weight for grains and other bulk commodities.For example,a bushel of wheat equals (27.216 kg),a bushel of barley (21.772 kg),a bushel of oats (14.515 kg), anda bushel of rye (25.401 kg).

chain (ch)a unit of distance formerly used by surveyors. The traditional British surveyor'schain, also called Gunter's chain because it was introduced by the Englishmathematician Edmund Gunter (1581-1626) in 1620, is 4 rods long: that's equalto exactly 1/80 mile, 1/10 furlong, 22 yards, or 66 feet (20.1168 meters). In themetric world, surveyors often use a chain of 20 meters (65.617 ft).

Cubic centimeter (cm3 or cc)the CGS unit of volume, equal to 10-6 cubic meter, 1 milliliter, or about 0.061 0237 cubic inch.

Cubic foot (ft3, cu ft, or cf)a traditional unit of volume in English speaking countries. One cubic foot equals1728 in3, 1/27 yd3, 0.028 316 85 m3, or 28.316 85 liters.

Cubic inch (in3, cu in, or ci)a traditional unit of volume in English speaking countries. One cubic inch equals1/1728 = 5.787 037 x 10-4 ft3, 16.3871 cm3, 16.3871 milliliters.

Cubic meter (m3)the SI unit of volume, equal to 106 cm3, 1000 liters, 35.3147 ft3, or 1.307 95 yd3.

Dhura traditional unit of land area in South Asia, equal to 1/20 kattha or 1/400 bigha.Like the bigha, the dhur varied in size from region to another.In Nepal, where the unit is still in use, the dhur equals about 16.9 square meters.

Foot (ft or ')a traditional unit of distance. is about 25 centimeters (9.8 inches).Now,foot of 30.48 centimeters is now called the international foot.

Furlong (fur)a traditional unit of distance. One furlong is exactly 201.168 meters, so a 200-meter dash covers a distance very close to a furlong.

Hectare (ha)the customary metric unit of land area, that is, the area of a square 100 meters oneach side: exactly 10 000 square meters or approximately 107 639.1 square feet,11 959.9 square yards, or 2.471 054 acres.

Hectare meter (ha·m)a unit of volume used to measure the capacity of reservoirs, equal to the volumeof water one meter deep covering one hectare. The unit is used mostly in BritishCommonwealth countries, especially India, where it provides a metric unitcomparable to the traditional English acre foot. Reservoir capacities are oftenstated in millions of hectare meters (Mha·m or MHM). One hectare meter equalsexactly 10 000 cubic meters or about 8.1071 acre feet.

Horsepower (hp)a unit of power representing the power exerted by a horse in pulling. Thehorsepower was defined by James Watt (1736-1819), the inventor of the steamengine, who determined after careful measurements that a horse is typically

capable of a power rate of 550 foot-pounds per second. This means that a horse,harnessed to an appropriate machine, can lift 550 pounds at the rate of 1 foot persecond. Today the SI unit of power is named for Watt, and one horsepower isequal to approximately 745.6999 watts.

Horsepower hour (hp hr)a unit of work or energy equal to the work done at the rate of 1 horsepower for 1hour. The horsepower hour equals 1 980 000 foot pounds or approximately 2.685megajoules, 2545 Btu, 641.1 (large) Calories, or 745.7 watt hours.

Inch (in or ") [1]a traditional unit of distance equal to 1/12 foot or exactly 2.54 centimeters.

Kanala traditional unit of land areain Pakistan, equal to 20 marlas.Under British rule the marla and kanal were standardized so that the kanal equalsexactly 605 square yards or 1/8 acre; this is equivalent to about 505.857 squaremeters.

Kattha or kattaa traditional unit of land area in South Asia, equal to 20 dhurs or 1/20 bigha. Likethe bigha, the kattha varied in size from one region to another.In Nepal, where the unit is still in use, the kattha equals about 338 square meters.

Kilovolt (kV)a common unit of electric potential equal to 1000 volts.

Kilovolt ampere (kV·A)a common unit of load in power engineering, equal to 1000 volt amperes.

Kilowatt (kW)a common metric unit of power, equivalent to 1000 watts, about 1.341 022horsepower.

Kilowatt hour (kW·h or kw hr)the commercial unit of electric energy. One kilowatt hour represents the amountof energy delivered at a rate of 1000 watts over a period of one hour. Since thewatt is 1 joule/sec and there are 3600 seconds in an hour, the kilowatt hour isequivalent to exactly 3.6 megajoules of energy, or about 3412.141 Btu, 859.846(kilogram) Calories, or about 2.655 million foot pounds.

Man houra common unit of labor equal to the work of one person for one hour. The lessrestrictive term person hour is gradually coming into use.

Marlaa traditional unit of area in Pakistan. The marla was standardized under Britishrule to be equal to the square rod, that is, 25.2929 square meters.

Megagram (Mg)an SI unit of mass equal to one million grams or 1000 kg.

Metric quintala unit of mass equal to 1 decitonne, 100 kilograms.

Metric ton (t or MT)an alternate name for the tonne.

ppb, ppm, ppq, ppt, pptrabbreviations for units of proportion: ppb = part per billion (10-9), ppm = part permillion (10-6), ppq = part per quadrillion (10-15), and ppt = part per trillion (10-12),respectively. However, the abbreviation "ppt" is also used sometimes for part perthousand (10-3). To avoid this confusion, "pptr" is an alternate abbreviation forpart per trillion.

Quintal (q) [2]a common metric unit of mass equal to 100 kilograms .

Ton (t) [2]a metric unit of mass, equal to 1000 kilograms.