| 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 |
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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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