Conversion Factors

 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 they are not SI Units.

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