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. 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 U.S., 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 3.048 dm
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 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 4.92892 ml
1 tablespoon (Tbsp) 3 tsp 1.47868 cl
1 US fluid ounce (fl oz) 2 Tbsp 2.95735 cl
1 US shot (jig) 3 Tbsp 4.4 cl
1 US gill (gl) 4 fl oz 1.18294 dl
1 US cup (cp) 2 gi or 2.4 dl
1 (liquid) US pint (pt) 2 cp 4.73176 dl
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 1.192405 hl
1 oil barrel (bbl) 42 gal 1.58987 hl
1 hogshead 63 gal 2.38481 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 2.83495 dag
1 pound (lb) 16 oz 4.53592 hg
1 US hundredweight (cwt) 100 lb 50.8023 kg
1 long hundredweight 112 lb 50.802345 kg
1 ton (short ton) 20 US cwt 907.185 kg
1 long ton 20 long cwt 1016.047 kg
Troy
1 grain (gr) 6.5 cg
1 pennyweight (dwt) 24 gr 1.55517 g
1 troy ounce (oz t) 20 dwt 3.11035 dag
1 troy pound (lb t) 12 oz t 37.3242 dag

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