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. 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). 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 change these units in favour of the metric system since the 1820s. Much infrastructure was built in past centuries using the old measures by both British and Americans. During the 20th century some segments such as science, medicine and the military of the United States converted to the metric system but the old units are still used for daily purposes by Americans. On the other hand, world trade is conducted using the metric system and except for the U.S., the world uses the metric system for 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 2.5 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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