Units of Conversion

Length:

1 inch= 2.54 cm 
1ft= 30.48 cm 
     = 0.3048m 
     = 3.281 ft

1m = 3.281 ft
1mile= 1.609km
1 naut mile= 1.852 km

Area:

1 Are= 100sq.m
          = 1 Gunta

1 Gunta= 33’X33’ 
1 acre = 43560 ft2 
           = 4047 m2
           =0.4047 ha
1ha     = 10000m2
           = 100 areas
           = 2.471

Volume:

1Cu.ft= 28.32 lit
1 imp-gal = 4.546 lit
1m3= 35.315 Cu.ft 
        = 1000 lit
1ha.cm = 100m3
 
Flow Rate:

1 cumec = 35.31 cusec 
1m3 /s = 35.41 Cu.ft /s

Pressure :

1 atm= 1 bar
         = 1 kg/cm2
         = 14.7 psi
         =30 inch of Hg
         = 76 cm of Hg

Weight:

1kg = 2.2 lbs 
1lbs= 453.6gms

1 carat= 200 mg

1 km2= 100 ha
          = 247 acres 
      
1mile2 = 640 acres 
            = 259 ha
            = 2.59km2

Power:

1 H.P = 74
          = 0.746 K.W

1 K.W. = 1000 watt 
             = 1.31 H.P

Source