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Quantity           English             Metric
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Length               1 mile        =    1.609347 km
                     1 yard        =    0.9144   m
                     1 foot        =    0.3048   m
                     1 inch        =   25.40     mm
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Area                 1 square mile =    2.590    km2               
                     1 acre        = 4047        m2                
                     1 acre        =    0.4047   ha
                     1 square yard =    0.8361   m2
                     1 square foot =    0.09290  m2
                     1 square inch =  645.2      mm2
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Volume               1 acre foot   = 1233        m3
                     1 cubic yard  =    0.7646   m3
                     1 cubic foot  =    0.02832  m3
                     1 cubic foot  =   28.32     l
                   100 board feet  =    0.2360   m3
                     1 gallon      =    3.785    l
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Mass                 1 lb          =    0.4536   kg
                     1 stone       =    6.3504   kg
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Mass/unit length     1 plf         =    1.488    kg/m
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Mass/unit area       1 psf         =    4.882    kg/m2
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Mass density         1 pcf         =   16.02     kg/m3
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Force                1 lb          =    4.448    N
                     1 kip         =    4.448    kN
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Force/unit length    1 plf         =   14.59     N/m
                     1 klf         =   14.59     kN/m
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Pressure etc.        1 psf         =   47.88    Pa
                     1 ksf         =   47.88    kPa
                     1 psi         =    6.895   kPa
                     1 ksi         =    6.895   MPa
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Liquid Measure
1 Imperial Pint = 0.568 litre
1 American Pint = 0.473 litre
1 Imperial Gallon = 4.546 litres
1 American Gallon = 3.785 litres

1 litre = 0.220 Imperial gallon = 0.264 American gallon

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