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Metric and U.S. Equivalents

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1 angstrom1 (light wave measurement) 0.1 nanometer
0.000 000 1 millimeter
0.000 000 004 inch
1 cable's length 120 fathoms
720 feet
219.456 meters
1 centimeter 0.3937 inch
1 chain (Gunter's or
 surveyor's)
66 feet
20.1168 meters
1 decimeter 3.937 inches
1 dekameter 32.808 feet
1 fathom 6 feet
1.8288 meters
1 foot 0.3048 meter
1 furlong 10 chains (surveyor's)
660 feet
220 yards
1/8 statute mile
201.168 meters
1 inch 2.54 centimeters
1 kilometer 0.621 mile
1 league (land) 3 statute miles
4.828 kilometers
1 link (Gunter's or
 surveyor's)
7.92 inches
0.201 168 meter
1 meter 39.37 inches
1.094 yards
1 micrometer 0.001 millimeter
0.000 039 37 inch
1 mil 0.001 inch
0.025 4 millimeter
1 mile (statute or
 land)
5,280 feet
1.609 kilometers
1 mile (nautical
 international)
1.852 kilometers
1.151 statute miles
0.999 U.S. nautical miles
1 millimeter 0.03937 inch
1 nanometer 0.001 micrometer or
0.000 000 039 37 inch
1 point (desktop
publishing)
0.013 889 inch
1/72 inch
0.352 778 millimeter
1/12 pica
1 rod, pole, or perch 161/2 feet
5.0292 meters
1 yard 0.9144 meter

Areas or Surfaces

1 acre 43,560 square feet
4,840 square yards
0.405 hectare
1 are 119.599 square yards
0.025 acre
1 hectare 2.471 acres
1 square centimeter 0.155 square inch
1 square decimeter 15.5 square inches
1 square foot 929.030 square centimeters
1 square inch 6.4516 square centimeters
1 square kilometer 0.386 square mile
247.105 acres
1 square meter 1.196 square yards
10.764 square feet
1 square mile 258.999 hectares
1 square millimeter 0.002 square inch
1 square rod, square pole or square perch25.293 square meters
1 square yard 0.836 square meters

Capacities or Volumes

1 barrel, liquid 31 to 42 gallons2
1 barrel, standard for fruits, vegetables, and other dry commodities except cranberries 7,056 cubic inches
105 dry quarts
3.281 bushels, struck measure
1 barrel, standard, cranberry 5,286 cubic inches
8645/64 dry quarts
2.709 bushels, struck measure
1 bushel (U.S.) struck measure3 2,150.42 cubic inches
35.238 liters
1 bushel, heaped (U.S.) 2,747.715 cubic inches
1.278 bushels, struck measure4
1 cord (firewood) 128 cubic feet
1 cubic centimeter 0.061 cubic inch
1 cubic decimeter 61.024 cubic inches
1 cubic foot 7.481 gallons
28.316 cubic decimeters
1 cubic inch 0.554 fluid ounce
4.433 fluid drams
16.387 cubic centimeters
1 cubic meter 1.308 cubic yards
1 cubic yard 0.765 cubic meter
1 cup, measuring 8 fluid ounces
1/2 liquid pint
1 dram, fluid or liquid (U.S.) 1/8 fluid ounces
0.226 cubic inch
3.697 milliliters
1.041 British fluid drachms
1 dekaliter 2.642 gallons
1.135 pecks
1 gallon (U.S.) 231 cubic inches
3.785 liters
0.833 British gallon
128 U.S. fluid ounces
1 gallon (British
Imperial)
277.42 cubic inches
1.201 U.S. gallons
4.546 liters
160 British fluid ounces
1 gill 7.219 cubic inches
4 fluid ounces
0.118 liter
1 hectoliter 26.418 gallons
2.838 bushels
1 liter 1.057 liquid quarts
0.908 dry quart
61.024 cubic inches
1 milliliter 0.271 fluid dram
16.231 minims
0.061 cubic inch
1 ounce, fluid or liquid (U.S.) 1.805 cubic inch
29.574 milliliters
1.041 British fluid ounces
1 peck 8.810 liters
1 pint, dry 33.600 cubic inches
0.551 liter
1 pint, liquid 28.875 cubic inches
0.473 liter
1 quart, dry (U.S.) 67.201 cubic inches
1.101 liters
0.969 British quart
1 quart, liquid (U.S.) 57.75 cubic inches
0.946 liter
0.833 British quart
1 quart (British) 69.354 cubic inches
1.032 U.S. dry quarts
1.201 U.S. liquid quarts
1 tablespoon,
measuring
3 teaspoons
4 fluid drams
1/2 fluid ounce
1 teaspoon,
measuring
1/3 tablespoon
11/3 fluid drams
1 assay ton5 29.167 grams
1 carat 200 milligrams
3.086 grains
1 dram, apothecaries' 60 grains
3.888 grams
1 dram, avoirdupois 27 11/32 (=27.344) grains
1.772 grams
1 grain 64.798 91 milligrams
1 gram 15.432 grains
0.035 avoirdupois ounce
1 hundredweight, gross or long6 112 pounds
50.802 kilograms
1 hundredweight, net or short 100 pounds
45.359 kilograms
1 kilogram 2.205 pounds
1 microgram (µg—
 the Greek letter mu
 in combination with
 the letter g)
0.000 001 gram
1 milligram 0.015 grain
1 ounce, avoirdupois 437.5 grains
0.911 troy or apothecaries' ounce
28.350 grams
1 ounce, troy or apothecaries'480 grains
1.097 avoirdupois ounces
31.103 grams
1 pennyweight 1.555 grams
1 point 0.01 carat
2 milligrams
1 pound, avoirdupois 7,000 grains
1.215 troy or apothecaries' pounds
453.592 37 grams
1 pound, troy or apothecaries'5,760 grains
0.823 avoirdupois pound
373.242 grams
1 ton, gross or long6 2,240 pounds
1.12 net tons
1.016 metric tons
1 ton, metric 2,204.623 pounds
0.984 gross ton
1.102 net tons
1 ton, net or short 2,000 pounds
0.893 gross ton
0.907 metric ton
1. The angstrom is basically defined as 10-10 meter.
2. There is a variety of “barrels” established by law or usage. For example, federal taxes on fermented liquors are based on a barrel of 31 gallons; many state laws fix the “barrel for liquids” at 311/2 gallons; one state fixes a 36-gallon barrel for cistern measurement; federal law recognizes a 40-gallon barrel for “proof spirits”; by custom, 42 gallons compose a barrel of crude oil or petroleum products for statistical purposes, and this equivalent is recognized “for liquids” by four states.
3. “Struck measure” refers to a struck, or level, bushel. It is the only official bushel measure in the UK.
4. Frequently recognized as 11/4 bushels, struck measure.
5. Used in assaying. The assay ton bears the same relation to the milligram that a ton of 2,000 pounds avoirdupois bears to the ounce troy; hence the weight in milligrams of precious metal obtained from one assay ton of ore gives directly the number of troy ounces to the net ton.
6. The gross or long ton is used commercially in the United States to only a limited extent, usually in restricted industrial fields. These units are the same as the British “ton.”

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