For our U.S. visitors,
a small metric conversion table:

Lengths
1 nautical mile = 1.852 km
1 mile = 1.609,344 km
1 foot = 0.304,8 m
1 inch = 2.54 cm

Areas
1 square mile = 2.589,988 sq.km
1 acre = 4,046.873 sq.m
1 square foot = 0.092,903,04 sq.m
1 square inch = 6.451,6 sq.cm

Volumes & Capacities
1 cubic foot = 0.028,317 cu.m
1 cubic inch = 16.387 cu.cm
1 U.S. gallon = 3.785,4 liters

Masses
1 pound = 0.453,6 kg
1 ounce = 28.349,5 g

Pressures
1 psi = 6,894.8 Pa
1 psi = 0.068,063 bar

Forces
1 lbf = 4.448,2 N

Speeds
1 knot = 1.852 km/h
1 fps = 0.304,8 m/s
1 mph = 1.609,344 km/h