1 acre = 43,560 ft^2 = 0.4047 hectares (ha) = 4046.86 m^2
1 mile = 5280 ft = 1.609 kilometers (km)
1 meter (m) = 3.281 feet (ft) = 39.37 inches (in)
1 pound (lb) = 16 ounces (oz) = 453.6 grams (g) = 0.4536 kilogram (kg)
1 liter (L) = 10^3 mL = 10^3 cm^3 = 1.057 US quarts
1000 L = 1 m^3 = 35.31 ft^3 = 264.2 US gallons
1 acre foot = 1.234*10^3 m^3
360 degrees = 2pi*radians
1 degree = 60 minutes (’) of arc