IMPORTANT UNIT CONVERSION

1 inch=25.4 mm                  
1 m= 39.37 inch
1 km = .621 mile
1 mile= 1.609 km

1 acre=  4046.86 sq.m
         = .4047 hectar
         = 43560 sq.ft
1 hectar = 10000 sq.m
             =2.471 acre
 1 katha= 720 sq.ft
1 bigha= 20 katha
           = 14400 sq.ft
1 acre= 100 cents