Length

1 mile = 1.609 km
1 yard = 0.9144 m
1 foot = 0.3048 m
1 inch = 25.4 mm

1 km = 0.6214 mile
1 m = 1.0936 yard
1 m = 3.2808 feet
1 mm = 0.0394 inch

Area

1 sq. mile = 2.59 km2
1 acre = 0.4047 hectare
1 acre = 4046.86 m2
1 sq. yard = 0.8361 m2
1 sq. foot = 0.0929 m2
1 sq. inch = 645.16 mm2

1 km2 = 0.3861 mile2
1 km2 = 247.105 acre
1 hectares = 2.4711 acre
1 m2 = 10.7639 feet2
1 mm2 = 0.0016 inch2