United States customary units

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U.S customary units is the system of units of measurement used to measure things in the United States.

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). To convert from Celsius to Fahrenheit: take the Celsius, multiply by nine, divide by five, and add thirty-two.

Units of weight 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.

Some people have been trying to get rid of these units in the United States and replace them with the metric system since the 1820s. During and after World War II much infrastructure was built using the old measures by both British and Americans. After the war some segments such as science, medicine and the military of the United States converted in the late 20th century.

Length
unit equal to Metric
1 point (p) 0.4 mm
1 pica (P̸) 12 points 4.2 mm
1 inch (in) 6 picas 2.5 cm
1 foot (ft) 12 inches 3 dm
1 yard (yd) 3 feet 0.9 m
1 mile (mi) 1760 yards 1.6 km
Area
Unit Equal to Metric
1 square survey foot (sq ft or ft2) 0.9 dm
1 square chain (sq ch or ch2) 4356 sq ft 4 dam
1 acre 10 sq ch 4 hm
1 section 640 acres 2.6 km
1 survey township (twp) 36 sections 93.2 km
Capacity Volume
Unit Equal to Metric
1 cubic inch (cu in) or (in3) 1.6 cl
1 cubic foot (cu ft) or (ft3) 1728 cu in 2.8 dal
1 cubic yard (cu yd) or (yd3) 27 cu ft 0.8 kl
1 acre-foot (acre ft) 1613.333 cu yd 1.2 kl
Liquid Volume
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 4.9 ml
1 tablespoon (Tbsp) 3 tsp 1.5 cl
1 US fluid ounce (fl oz) 2 Tbsp 3 cl
1 US shot (jig) 3 Tbsp 4.4 cl
1 US gill (gi) 4 fl oz 1.2 dl
1 US cup (cp) 2 gi or 2.4 dl
1 (liquid) US pint (pt) 2 cp 4.7 dl
1 (liquid) US quart (qt) 2 pt 0.9 l
1 (liquid) US gallon (gal) 4 qt 3.8 l
1 (liquid) barrel (bbl) 31.5 gal 1.2 hl
1 oil barrel (bbl) 42 gal 1.6 hl
1 hogshead 63 gal 2.4 hl
Dry Volume
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 0.8 dal
1 bushel (bu) 4 pk 3.5 dal
1 (dry) barrel (bbl) 3.281 bu 1.1 hl
Mass
Unit Equal to Metric
Avoirdupois
1 grain (gr) 0.6 dg
1 dram (dr) 27 11⁄32 gr 1.8 g
1 ounce (oz) 16 dr 2.8 dag
1 pound (lb) 16 oz 4.5 hg
1 US hundredweight (cwt) 100 lb 45.6 kg
1 long hundredweight 112 lb 50.8 kg
1 ton (short ton) 20 US cwt 907.2 kg
1 long ton 20 long cwt 1016 kg
Troy
1 grain (gr) 6.5 cg
1 pennyweight (dwt) 24 gr 1.5 g
1 troy ounce (oz t) 20 dwt 3.1 dag
1 troy pound (lb t) 12 oz t 7.3 dag

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