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Symbol:  a 
Category:  Area 
SI Equivalent:  100 m2
Dimension L2 
System:  French 
French metric area unit introduced after the French Revolution. It is often used in surveyor's measurements and is still used in agriculture.
Convert     a  
1 a =
  Symbol Unit Name
2.47105×10-2  ac, acre  acre 
10×1029  b  barn 
255.618  bbl (US, liq.)/ft  barrel (US, liq.) per foot 
21.3015  bbl (US, liq.)/in  barrel (US, liq.) per inch 
191.713  bbl (US, petrol)/ft  barrel (US, petrol) per foot 
15.9761  bbl (US, petrol)/in  barrel (US, petrol) per inch 
100    centare 
1.97353×105  cin  circular inch 
1.97353×1011  cmil  circular mil 
1×10-2  ha  hectare 
1.21295×10-2    morgen (Dutch) 
3.94907×10-2    morgen (Prussian) 
1.1675×10-2    morgen (South Africa) 
1.54441×10-4    quarter section 
9.88422×10-2    rood (UK) 
3.86102×10-5  sq.mi, mi2 (stat.)  section (square statute mile) 
1×1054    shed 
1×106  cm2  square centimeter 
0.107639  sq. ch. (engineer's)  square chain (engineer's) 
0.247105  sq. ch. (Gunter's)  square chain (Gunter's) 
dam2  square decameter 
1×104  dm2  square decimeter 
1×10-34  Em2  square exameter 
10×1031  fm2  square femtometer 
10×1031  f2  square fermi 
1076.39  ft2  square foot 
1×10-16  Gm2  square gigameter 
1×10-2  hm2  square hectometer 
1.55×105  in2, sq. in  square inch 
1×10-4  km2  square kilometer 
1×10-10  Mm2  square megameter 
100  m2  square meter 
1×1014  ┬Ám2  square micrometer 
1.55×1011  mil2  square mil (thou) 
1.81554×10-6  sq. mi. (geogr.)  square mile (geographical) 
2.91553×10-5  sq. mi. (int. naut.)  square mile (int. naut.) 
3.86101×10-5  sq. mi. (int.)  square mile (int.) 
1×108  mm2  square millimeter 
10×1019  nm2  square nanometer 
3.95366  rd2  square perch 
10×10-29  Pm2  square petameter 
10×1025  pm2  square picometer 
3.95366  rd2  square pole 
3.95366  rd2  square rod 
10×10-23  Tm2  square terameter 
119.599  yd2, sq. yd  square yard 
1×1050  ym2  square yoctometer 
2.93874×10-37  Ym2  square yottameter 
9.99473×1043  zm2  square zeptometer 
2.93874×10-37  Zm2  square zettameter 
1.07251×10-6    township (US) 
5.55987×10-2    vergee (Jersey) 
6.48652×10-2    vergees (Guernsey) 
Fuel Consumption
  Symbol Unit Name
4.25144×107  gal/mile  gallon per mile 
1×1010  l/100 km  liter per 100 kilometers 
1×108  l/km  liter per kilometer 
Hydrodynamic permeability
  Symbol Unit Name
1.01325×1014    darcy