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acre
Symbol:  ac, acre 
Category:  Area 
SI Equivalent:  4046.86 m2
Dimension L2 
System:  UK, US, CAN 
 
Notes
British unit of area used in surveyor's measurements. This is the English statute acre, and the US statute acre is the same. The acre was first defined in England in the reign of Edward I and is thought to be the area which a yoke of oxen could plow in a day. The acre was limited to its present definite quantity by statutes of Edward I, Edward III, and Henry VIII.
1 acre =1/640 square mile
  =4 roods
  =10 square chains (Gunter's)
  =160 square rods
  =4840 square yards
Convert     ac, acre  
57 conversions, showing those commonly used | Show all
1 ac, acre =
Area
  Symbol Unit Name
4.04686×1031  b  barn 
0.404686  ha  hectare 
4.04686×107  cm2  square centimeter 
4.356×104  ft2  square foot 
0.404686  hm2  square hectometer 
6.27264×106  in2, sq. in  square inch 
4.04686×10-3  km2  square kilometer 
4046.86  m2  square meter 
4.04686×1015  ┬Ám2  square micrometer 
6.27264×1012  mil2  square mil (thou) 
1.56249×10-3  sq. mi. (int.)  square mile (int.) 
4.04686×109  mm2  square millimeter 
4840  yd2, sq. yd  square yard 
more...
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