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United States customary units
U.S customary units is the system of units of measurement used to measure things in the United States. The system of Imperial units is similar and in some parts identical.
Length or distance units include the inch, foot, yard and mile.
Land units include square miles (2589998.47032 square meter) and acres (4046.8726 square meter).
Common volume units are the teaspoon, tablespoon (3 teaspoons), fluid ounce (two tablespoons), cup (8 ounces), pint (2 cups, or 16 fluid ounces), quart (2 pints, or 32 fluid ounces), US gallon (16 cups, 128 fluid ounces, or 3.8 liters).
A barrel is the unit to measure oil.
Temperature is measured in degrees Fahrenheit (°F). Here is a formula to convert from °C to °F: [math]\frac{9}{5}C+32[/math]^{[a]}
Units of weight and mass include the pound (453.6 grams), which contains 16 ounces. This should not be confused with the British pound which is a type of money. The different uses of the word pound can cause confusion. Different sizes of ounce are also in use.
Some people have been trying to replace these units with the metric system since the 1820s. Much infrastructure in the United States and British Empire was built in past centuries using the old measures. During the 20th century some sectors such as science, medicine and the military of the United States converted to metric but Americans still use the old units for daily purposes. On the other hand, world trade is conducted using the metric system and except for the US, the world uses the metric system for almost all purposes.
Length
unit  equal to  Metric 

1 point (p)  0.4 mm  
1 pica (P̸)  12 points  4.2 mm 
1 inch (in)  6 picas  2.54 cm 
1 foot (ft)  12 inches  30.48 cm 
1 yard (yd)  3 feet  0.9144 m 
1 mile (mi)  1760 yards  1.609344 km 
Area
Unit  Equal to  Metric 

1 square (survey) foot (sq ft or ft^{2})  0.0929 m^{2}  
1 square chain (sq ch or ch^{2})  4356 sq ft  40 m^{2} 
1 acre  10 sq ch  4 047 m^{2} 
1 section  640 acres  2.6 km^{2} 
1 (survey) township (twp)  36 sections  93.2 km^{2} 
Volume
Unit  Equal to  Metric 

1 cubic inch (cu in) or (in^{3})  16 mL  
1 cubic foot (cu ft) or (ft^{3})  1728 cu in  28 L 
1 cubic yard (cu yd) or (yd^{3})  27 cu ft  800 L 
1 acrefoot (acre ft)  1613.333 cu yd  1,233,000 L 
Unit  Equal to  Metric 

1 minim (min)  1 drop  0.1 mL 
1 US fluid dram (fl dr)  60 min  3.7 mL 
1 teaspoon (tsp)  80 min  4.92892 mL 
1 tablespoon (Tbsp)  3 tsp  14.7868 mL 
1 US fluid ounce (fl oz)  2 Tbsp  29.5735 mL 
1 US shot (jig)  3 Tbsp  44 mL 
1 US gill (gi)  4 fl oz  118.294 mL 
1 US cup (cp)  2 gi  240 mL 
1 (liquid) US pint (pt)  2 cp  473.176 mL 
1 (liquid) US quart (qt)  2 pt  0.946353 L 
1 (liquid) US gallon (gal)  4 qt  3.78541 L 
1 (liquid) barrel (bbl)  31.5 gal  119.2405 L 
1 oil barrel (bbl)  42 gal  158.987 L 
1 hogshead  63 gal  238.481 L 
Unit  Equal to  Metric 

1 (dry) pint (pt)  0.6 L  
1 (dry) quart (qt)  2 pt  1.1 L 
1 (dry) gallon (gal)  4 qt  4.4 L 
1 peck (pk)  2 gal  8 L 
1 bushel (bu)  4 pk  35 L 
1 (dry) barrel (bbl)  3.281 bu  110 L 
Mass and weight
Unit  Equal to  Metric 

1 grain (gr)  60 mg  
1 dram (dr)  27 11⁄32 gr  1.8 g 
1 ounce (oz)  16 dr  28.3495 g 
1 pound (lb)  16 oz  453.592 g 
1 US hundredweight (cwt)  100 lb  45.3592 kg 
1 long hundredweight  112 lb  50.802345 kg 
1 short ton  20 US cwt  907.185 kg 
1 long ton  20 long cwt  1,016.047 kg 
Unit  Equal to  Metric 

1 grain (gr)  65 mg  
1 pennyweight (dwt)  24 gr  1.55517 g 
1 troy ounce (oz t)  20 dwt  31.1035 g 
1 troy pound (lb t)  12 oz t  373.242 g 
Related pages
Notes
 ↑ Where "C" means "Celsius".
