Measurement  US Customary Unit  SI Unit  To Convert  Multiply By 
LENGTH  Foot  Meter  Feet to Meters  0.3048 
AREA  Square Foot  Square Meters  Square Feet to Square Meters  0.09290304 
AREA  Square Foot  Hectares  Square Feet to Hectares  0.000009290304 
AREA  Acres  Hectares  Acres to Hectares  0.4046873 
VOLUME  US Fluid Ounce  Milliliters  Fluid Ounces to Milliliters  29.57353 
VOLUME  Gallon  Liters  Gallons to Liters  3.785412 
VOLUME  Gallon  Steres  Gallons to Steres  0.003785412 
VOLUME  Cubic Foot  Steres  Cubic Feet to Steres  0.02831685 
MASS  Pound  Kilogram  Pounds to Kilograms  0.4535924 
VELOCITY  Foot/Second  Meter/Second  Ft / sec to m / s  0.3048 
VELOCITY  Miles/Hour  Meter/Second  mph to m / s  0.44704 
FORCE  Pound  Newton  Pounds to Newtons  4.44822205 
PRESSURE  Pounds per Square Inch  Pascal  psi to Pascals  6,894.757 
ENERGY  Foot Pound  Joule  Foot Pounds to Joules  1.355818 
POWER  Horsepower  Watt  Horsepower to Watts  745.6999 
ANGLE  Degree  Radian  Degrees to Radians  .01745329 

If you are wondering what the "SI Unit" is, it means the International System of Units in use by just about every counrty except the United States which has been slow to adopt it.
The seven basic units of the International System of Units (or Système International as it is also called), are ampere (electrical current), kelvin (temperature), second (time), meter (length), kilogram (mass), candela (luminosity) and mole (amount of subtance).
Basically, in everyday life, we don't use amperes, candelas or moles that much and the Celsius scale is used much more often than Kelvin, which is why those units are not listed in the above table.
The hectare is not a convenient unit for area in everyday life. You could say your kitchen floor measures 0.0008918692 hectares but that doesn't give you a good idea of its size. A hectare is a rather large unit of measure 100 x 100 meters (10,000 square meters!). The sqaure meter (1 meter by 1 meter) is much more convenient for everyday use. One square foot equals 0.09290304 square meters.
The stere (cubic meter) is another inconvenient unit for everyday life. One cubic meter (1m x 1m x 1m) is a huge amount of volume and it equals 1,000 liters (35.31 cubic feet) and one stere of water weighs 2,200 pounds!
Liters and milliliters are much more convenient even though thay are not SI Units.
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