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Category:  Hydrodynamic permeability 
SI Equivalent:  9.86923×10-13 m2
Dimension L2 
System:  cgs 
Named after H. Darcy (1803-1858), one darcy corresponds to the volume of a liquid with a dynamic viscosity of 1 centipoise flowing through a porous material with a cross section of 1 cm2 in 1 second when undergoing a pressure drop of 1 atm/cm. This unit was used in hydrology and civil engineering to measure the permeability of porous materials.
Convert     darcy  
1 darcy =
  Symbol Unit Name
2.43874×10-16  ac, acre  acre 
9.86923×10-15  a  are 
9.86923×1015  b  barn 
2.52275×10-12  bbl (US, liq.)/ft  barrel (US, liq.) per foot 
2.10229×10-13  bbl (US, liq.)/in  barrel (US, liq.) per inch 
1.89206×10-12  bbl (US, petrol)/ft  barrel (US, petrol) per foot 
1.57672×10-13  bbl (US, petrol)/in  barrel (US, petrol) per inch 
9.86923×10-13    centare 
1.94772×10-9  cin  circular inch 
1.94772×10-3  cmil  circular mil 
9.86923×10-17  ha  hectare 
1.19709×10-16    morgen (Dutch) 
3.89743×10-16    morgen (Prussian) 
1.15223×10-16    morgen (South Africa) 
1.52421×10-18    quarter section 
9.75496×10-16    rood (UK) 
3.81053×10-19  sq.mi, mi2 (stat.)  section (square statute mile) 
9.86923×1039    shed 
9.86923×10-9  cm2  square centimeter 
1.06232×10-15  sq. ch. (engineer's)  square chain (engineer's) 
2.43874×10-15  sq. ch. (Gunter's)  square chain (Gunter's) 
9.86923×10-15  dam2  square decameter 
9.86923×10-11  dm2  square decimeter 
9.86923×10-49  Em2  square exameter 
9.86923×1017  fm2  square femtometer 
9.86923×1017  f2  square fermi 
1.06232×10-11  ft2  square foot 
9.86923×10-31  Gm2  square gigameter 
9.86923×10-17  hm2  square hectometer 
1.52973×10-9  in2, sq. in  square inch 
9.86923×10-19  km2  square kilometer 
9.86923×10-25  Mm2  square megameter 
9.86923×10-13  m2  square meter 
0.986923  ┬Ám2  square micrometer 
1.52973×10-3  mil2  square mil (thou) 
1.7918×10-20  sq. mi. (geogr.)  square mile (geographical) 
2.87741×10-19  sq. mi. (int. naut.)  square mile (int. naut.) 
3.81052×10-19  sq. mi. (int.)  square mile (int.) 
9.86923×10-7  mm2  square millimeter 
9.86923×105  nm2  square nanometer 
3.90196×10-14  rd2  square perch 
9.86923×10-43  Pm2  square petameter 
9.86923×1011  pm2  square picometer 
3.90196×10-14  rd2  square pole 
3.90196×10-14  rd2  square rod 
9.86923×10-37  Tm2  square terameter 
1.18035×10-12  yd2, sq. yd  square yard 
9.86923×1035  ym2  square yoctometer 
2.90031×10-51  Ym2  square yottameter 
9.86403×1029  zm2  square zeptometer 
2.90031×10-51  Zm2  square zettameter 
1.05848×10-20    township (US) 
5.48717×10-16    vergee (Jersey) 
6.40169×10-16    vergees (Guernsey) 
Fuel Consumption
  Symbol Unit Name
4.19584×10-7  gal/mile  gallon per mile 
9.86923×10-5  l/100 km  liter per 100 kilometers 
9.86923×10-7  l/km  liter per kilometer