This page was last updated on 18 December, 2008
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Appendix G - Weights and Measures
Note: At this time, only three countries - Burma, Liberia, and the US - have not adopted the International System of Units (SI, or metric system) as their official system of weights and measures. Although use of the metric system has been sanctioned by law in the US since 1866, it has been slow in displacing the American adaptation of the British Imperial System known as the US Customary System. The US is the only industrialized nation that does not mainly use the metric system in its commercial and standards activities, but there is increasing acceptance in science, medicine, government, and many sectors of industry.
Mathematical Notation
Mathematical Power Name
10^18 or 1,000,000,000,000,000,000 one quintillion 10^15 or 1,000,000,000,000,000 one quadrillion 10^12 or 1,000,000,000,000 one trillion 10^9 or 1,000,000,000 one billion 10^6 or 1,000,000 one million 10^3 or 1,000 one thousand 10^2 or 100 one hundred 10^1 or 10 ten 10^0 or 1 one 10^-1 or 0.1 one-tenth 10^-2 or 0.01 one-hundredth 10^-3 or 0.001 one-thousandth 10^-6 or 0.000 001 one-millionth 10^-9 or 0.000 000 001 one-billionth 10^-12 or 0.000 000 000 001 one-trillionth 10^-15 or 0.000 000 000 000 001 one-quadrillionth 10^-18 or 0.000 000 000 000 000 001 one-quintillionth
Metric Interrelationships
Prefix Symbol Length, weight, or capacity
yotta Y 10^24 zetta Z 10^21 exa E 10^18 peta P 10^15 tera T 10^12 giga G 10^9 mega M 10^6 kilo k 10^3 hecto h 10^2 deka da 10^1 basic unit - 1 meter, 1 gram, 1 liter deci d 10^-1 centi c 10^-2 milli m 10^-3 micro u 10^-6 nano n 10^-9 pico p 10^-12 femto f 10^-15 atto a 10^-18 zepto z 10^-21 yocto y 10^-24
Conversion Factors
To Convert From To Multiply By
acres ares 40.468 564 224 acres hectares 0.404 685 642 24 acres square feet 43,560 acres square kilometers 0.004 046 856 422 4 acres square meters 4,046.856 422 4 acres square miles (statute) 0.001 562 50 acres square yards 4,840 ares square meters 100 ares square yards 119.599 barrels, US beer gallons 31 barrels, US beer liters 117.347 77 barrels, US petroleum gallons (British) 34.97 barrels, US petroleum gallons (US) 42 barrels, US petroleum liters 158.987 29 barrels, US proof spirits gallons 40 barrels, US proof spirits liters 151.416 47 bushels (US) bushels (British) 0.968 9 bushels (US) cubic feet 1.244 456 bushels (US) cubic inches 2,150.42 bushels (US) cubic meters 0.035 239 07 bushels (US) cubic yards 0.046 090 96 bushels (US) dekaliters 3.523 907 bushels (US) dry pints 64 bushels (US) dry quarts 32 bushels (US) liters 35.239 070 17 bushels (US) pecks 4 cables fathoms 120 cables meters 219.456 cables yards 240 carat milligrams 200 centimeters feet 0.032 808 40 centimeters inches 0.393 700 8 centimeters meters 0.01 centimeters yards 0.010 936 13 centimeters, cubic cubic inches 0.061 023 744 centimeters, square square feet 0.001 076 39 centimeters, square square inches 0.155 000 31 centimeters, square square meters 0.000 1 centimeters, square square yards 0.000 119 599 chains, square surveyor's ares 4.046 86 chains, square surveyor's square feet 4,356 chains, surveyor's feet 66 chains, surveyor's meters 20.116 8 chains, surveyor's rods 4 cords of wood cubic feet 128 cords of wood cubic meters 3.624 556 cords of wood cubic yards 4.740 7 cups liquid ounces (US) 8 cups liters 0.236 588 2 degrees Celsius degrees Fahrenheit multiply by 1.8 and add 32 degrees Fahrenheit degrees Celsius subtract 32 and divide by 1.8 dekaliters bushels 0.283 775 9 dekaliters cubic feet 0.353 146 7 dekaliters cubic inches 610.237 4 dekaliters dry pints 18.161 66 dekaliters dry quarts 9.080 829 8 dekaliters liters 10 dekaliters pecks 1.135 104 drams, avoirdupois avoirdupois ounces 0.062 55 drams, avoirdupois grains 27.344 drams, avoirdupois grams 1.771 845 2 drams, troy grains 60 drams, troy grams 3.887 934 6 drams, troy scruples 3 drams, troy troy ounces 0.125 drams, liquid (US) cubic inches 0.226 drams, liquid (US) liquid drams (British) 1.041 drams, liquid (US) liquid ounces 0.125 drams, liquid (US) milliliters 3.696 69 drams, liquid (US) minims 60 fathoms feet 6 fathoms meters 1.828 8 feet centimeters 30.48 feet inches 12 feet kilometers 0.000 304 8 feet meters 0.304 8 feet statute miles 0.000 189 39 feet yards 0.333 333 3 feet, cubic bushels 0.803 563 95 feet, cubic cubic decimeters 28.316 847 feet, cubic cubic inches 1,728 feet, cubic cubic meters 0.028 316 846 592 feet, cubic cubic yards 0.037 037 04 feet, cubic dry pints 51.428 09 feet, cubic dry quarts 25.714 05 feet, cubic gallons 7.480 519 feet, cubic gills 239.376 6 feet, cubic liquid ounces 957.506 5 feet, cubic liquid pints 59.844 16 feet, cubic liquid quarts 29.922 08 feet, cubic liters 28.316 846 592 feet, cubic pecks 3.214 256 feet, square acres 0.000 022 956 8 feet, square square centimeters 929.030 4 feet, square square decimeters 9.290 304 feet, square square inches 144 feet, square square meters 0.092 903 04 feet, square square yards 0.111 111 1 furlongs feet 660 furlongs inches 7,920 furlongs meters 201.168 furlongs statute miles 0.125 furlongs yards 220 gallons, liquid (US) cubic feet 0.133 680 6 gallons, liquid (US) cubic inches 231 gallons, liquid (US) cubic meters 0.003 785 411 784 gallons, liquid (US) cubic yards 0.004 951 13 gallons, liquid (US) gills (US) 32 gallons, liquid (US) liquid gallons (British) 0.832 67 gallons, liquid (US) liquid ounces 128 gallons, liquid (US) liquid pints 8 gallons, liquid (US) liquid quarts 4 gallons, liquid (US) liters 3.785 411 784 gallons, liquid (US) milliliters 3,785.411 784 gallons, liquid (US) minims 61,440 gills (US) centiliters 11.829 4 gills (US) cubic feet 0.004 177 517 gills (US) cubic inches 7.218 75 gills (US) gallons 0.031 25 gills (US) gills (British) 0.832 67 gills (US) liquid ounces 4 gills (US) liquid pints 0.25 gills (US) liquid quarts 0.125 gills (US) liters 0.118 294 118 25 gills (US) milliliters 118.294 118 25 gills (US) minims 1,920 grains avoirdupois drams 0.036 571 43 grains avoirdupois ounces 0.002 285 71 grains avoirdupois pounds 0.000 142 86 grains grams 0.064 798 91 grains kilograms 0.000 064 798 91 grains milligrams 64.798 910 grains pennyweights 0.042 grains scruples 0.05 grains troy drams 0.016 6 grains troy ounces 0.002 083 33 grains troy pounds 0.000 173 61 grams avoirdupois drams 0.564 383 39 grams avoirdupois ounces 0.035 273 961 grams avoirdupois pounds 0.002 204 622 6 grams grains 15.432 361 grams kilograms 0.001 grams milligrams 1,000 grams troy ounces 0.032 150 746 6 grams troy pounds 0.002 679 23 hands (height of horse) centimeters 10.16 hands (height of horse) inches 4 hectares acres 2.471 053 8 hectares square feet 107,639.1 hectares square kilometers 0.01 hectares square meters 10,000 hectares square miles 0.003 861 02 hectares square yards 11,959.90 hundredweights, long avoirdupois pounds 112 hundredweights, long kilograms 50.802 345 hundredweights, long long tons 0.05 hundredweights, long metric tons 0.050 802 345 hundredweights, long short tons 0.056 hundredweights, short avoirdupois pounds 100 hundredweights, short kilograms 45.359 237 hundredweights, short long tons 0.044 642 86 hundredweights, short metric tons 0.045 359 237 hundredweights, short short tons 0.05 inches centimeters 2.54 inches feet 0.083 333 33 inches meters 0.025 4 inches millimeters 25.4 inches yards 0.027 777 78 inches, cubic bushels 0.000 465 025 inches, cubic cubic centimeters 16.387 064 inches, cubic cubic feet 0.000 578 703 7 inches, cubic cubic meters 0.000 016 387 064 inches, cubic cubic yards 0.000 021 433 47 inches, cubic dry pints 0.029 761 6 inches, cubic dry quarts 0.014 880 8 inches, cubic gallons 0.004 329 0 inches, cubic gills 0.138 528 1 inches, cubic liquid ounces 0.554 112 6 inches, cubic liquid pints 0.034 632 03 inches, cubic liquid quarts 0.017 316 02 inches, cubic liters 0.016 387 064 inches, cubic milliliters 16.387 064 inches, cubic minims (US) 265.974 0 inches, cubic pecks 0.001 860 10 inches, square square centimeters 6.451 600 inches, square square feet 0.006 944 44 inches, square square meters 0.000 645 16 inches, square square yards 0.000 771 605 kilograms avoirdupois drams 564.383 4 kilograms avoirdupois ounces 35.273 962 kilograms avoirdupois pounds 2.204 622 622 kilograms grains 15,432.36 kilograms grams 1,000 kilograms long tons 0.000 984 2 kilograms metric tons 0.001 kilograms short hundredweights 0.022 046 23 kilograms short tons 0.001 102 31 kilograms troy ounces 32.150 75 kilograms troy pounds 2.679 229 kilometers meters 1,000 kilometers statute miles 0.621 371 192 kilometers, square acres 247.105 38 kilometers, square hectares 100 kilometers, square square meters 1,000,000 kilometers, square statute miles 0.386 102 16 knots (nautical mi/hr) kilometers/hour 1.852 knots (nautical mi/hr) statute miles/hour 1.151 leagues, nautical kilometers 5.556 leagues, nautical nautical miles 3 leagues, statute kilometers 4.828 032 leagues, statute statute miles 3 links, square surveyor's square centimeters 404.686 links, square surveyor's square inches 62.726 4 links, surveyor's centimeters 20.116 8 links, surveyor's chains 0.01 links, surveyor's inches 7.92 liters bushels 0.028 377 59 liters cubic feet 0.035 314 67 liters cubic inches 61.023 74 liters cubic meters 0.001 liters cubic yards 0.001 307 95 liters dekaliters 0.1 liters dry pints 1.816 166 liters dry quarts 0.908 082 98 liters gallons 0.264 172 052 liters gills (US) 8.453 506 liters liquid ounces 33.814 02 liters liquid pints 2.113 376 liters liquid quarts 1.056 688 2 liters milliliters 1,000 liters pecks 0.113 510 4 meters centimeters 100 meters feet 3.280 839 895 meters inches 39.370 079 meters kilometers 0.001 meters millimeters 1,000 meters statute miles 0.000 621 371 meters yards 1.093 613 298 meters, cubic bushels 28.377 59 meters, cubic cubic feet 35.314 666 7 meters, cubic cubic inches 61,023.744 meters, cubic cubic yards 1.307 950 619 meters, cubic gallons 264.172 05 meters, cubic liters 1,000 meters, cubic pecks 113.510 4 meters, square acres 0.000 247 105 38 meters, square hectares 0.000 1 meters, square square centimeters 10,000 meters, square square feet 10.763 910 4 meters, square square inches 1,550.003 1 meters, square square yards 1.195 990 046 microns meters 0.000 001 microns inches 0.000 039 4 mils inches 0.001 mils millimeters 0.025 4 miles, nautical kilometers 1.852 0 miles, nautical statute miles 1.150 779 4 miles, statute centimeters 160,934.4 miles, statute feet 5,280 miles, statute furlongs 8 miles, statute inches 63,360 miles, statute kilometers 1.609 344 miles, statute meters 1,609.344 miles, statute rods 320 miles, statute yards 1,760 miles, square nautical square kilometers 3.429 904 miles, square nautical square statute miles 1.325 miles, square statute acres 640 miles, square statute hectares 258.998 811 033 6 miles, square statute sections 1 miles, square statute square kilometers 2.589 988 110 336 miles, square statute square nautical miles 0.755 miles miles, square statute square rods 102,400 milligrams grains 0.015 432 358 35 milliliters cubic inches 0.061 023 744 milliliters gallons 0.000 264 17 milliliters gills (US) 0.008 453 5 milliliters liquid ounces 0.033 814 02 milliliters liquid pints 0.002 113 4 milliliters liquid quarts 0.001 056 7 milliliters liters 0.001 milliliters minims 16.230 73 millimeters inches 0.039 370 078 7 minims (US) cubic inches 0.003 759 77 minims (US) gills (US) 0.000 520 83 minims (US) liquid ounces 0.002 083 33 minims (US) milliliters 0.061 611 52 minims (US) minims (British) 1.041 ounces, avoirdupois avoirdupois drams 16 ounces, avoirdupois avoirdupois pounds 0.062 5 ounces, avoirdupois grains 437.5 ounces, avoirdupois grams 28.349 523 125 ounces, avoirdupois kilograms 0.028 349 523 125 ounces, avoirdupois troy ounces 0.911 458 3 ounces, avoirdupois troy pounds 0.075 954 86 ounces, liquid (US) cubic feet 0.001 044 38 ounces, liquid (US) centiliters 2.957 35 ounces, liquid (US) cubic inches 1.804 687 5 ounces, liquid (US) gallons 0.007 812 5 ounces, liquid (US) gills (US) 0.25 ounces, liquid (US) liquid drams 8 ounces, liquid (US) liquid ounces (British) 1.041 ounces, liquid (US) liquid pints 0.062 5 ounces, liquid (US) liquid quarts 0.031 25 ounces, liquid (US) liters 0.029 573 53 ounces, liquid (US) milliliters 29.573 529 6 ounces, liquid (US) minims 480 ounces, troy avoirdupois drams 17.554 29 ounces, troy avoirdupois ounces 1.097 143 ounces, troy avoirdupois pounds 0.068 571 43 ounces, troy grains 480 ounces, troy grams 31.103 476 8 ounces, troy pennyweights 20 ounces, troy troy drams 8 ounces, troy troy pounds 0.083 333 3 paces (US) centimeters 76.2 paces (US) inches 30 pecks (US) bushels 0.25 pecks (US) cubic feet 0.311 114 pecks (US) cubic inches 537.605 pecks (US) cubic meters 0.008 809 77 pecks (US) cubic yards 0.011 522 74 pecks (US) dekaliters 0.880 976 75 pecks (US) dry pints 16 pecks (US) dry quarts 8 pecks (US) liters 8.809 767 5 pecks (US) pecks (British) 0.968 9 pennyweights grains 24 pennyweights grams 1.555 173 84 pennyweights troy ounces 0.05 pints, dry (US) bushels 0.015 625 pints, dry (US) cubic feet 0.019 444 63 pints, dry (US) cubic inches 33.600 312 5 pints, dry (US) dekaliters 0.055 061 05 pints, dry (US) dry pints (British) 0.968 9 pints, dry (US) dry quarts 0.5 pints, dry (US) liters 0.550 610 47 pints, liquid (US) cubic feet 0.016 710 07 pints, liquid (US) cubic inches 28.875 pints, liquid (US) deciliters 4.731 76 pints, liquid (US) gallons 0.125 pints, liquid (US) gills (US) 4 pints, liquid (US) liquid ounces 16 pints, liquid (US) liquid pints (British) 0.832 67 pints, liquid (US) liquid quarts 0.5 pints, liquid (US) liters 0.473 176 473 pints, liquid (US) milliliters 473.176 473 pints, liquid (US) minims 7,680 points (typographical) inches 0.013 837 points (typographical) millimeters 0.351 459 8 pounds, avoirdupois avoirdupois drams 256 pounds, avoirdupois avoirdupois ounces 16 pounds, avoirdupois grains 7,000 pounds, avoirdupois grams 453.592 37 pounds, avoirdupois kilograms 0.453 592 37 pounds, avoirdupois long tons 0.000 446 428 6 pounds, avoirdupois metric tons 0.000 453 592 37 pounds, avoirdupois quintals 0.004 535 92 pounds, avoirdupois short tons 0.000 5 pounds, avoirdupois troy ounces 14.583 33 pounds, avoirdupois troy pounds 1.215 278 pounds, troy avoirdupois drams 210.651 4 pounds, troy avoirdupois ounces 13.165 71 pounds, troy avoirdupois pounds 0.822 857 1 pounds, troy grains 5,760 pounds, troy grams 373.241 721 6 pounds, troy kilograms 0.373 241 721 6 pounds, troy pennyweights 240 pounds, troy troy ounces 12 quarts, dry (US) bushels 0.031 25 quarts, dry (US) cubic feet 0.038 889 25 quarts, dry (US) cubic inches 67.200 625 quarts, dry (US) dekaliters 0.110 122 1 quarts, dry (US) dry pints 2 quarts, dry (US) dry quarts (British) 0.968 9 quarts, dry (US) liters 1.101 221 quarts, dry (US) pecks 0.125 quarts, dry (US) pints, dry (US) 2 quarts, liquid (US) cubic feet 0.033 420 14 quarts, liquid (US) cubic inches 57.75 quarts, liquid (US) deciliters 9.463 53 quarts, liquid (US) gallons 0.25 quarts, liquid (US) gills (US) 8 quarts, liquid (US) liquid ounces 32 quarts, liquid (US) liquid pints (US) 2 quarts, liquid (US) liquid quarts (British) 0.832 67 quarts, liquid (US) liters 0.946 352 946 quarts, liquid (US) milliliters 946.352 946 quarts, liquid (US) minims 15,360 quintals avoirdupois pounds 220.462 26 quintals kilograms 100 quintals metric tons 0.1 rods feet 16.5 rods meters 5.029 2 rods yards 5.5 rods, square acres 0.006 25 rods, square square meters 25.292 85 rods, square square yards 30.25 scruples grains 20 scruples grams 1.295 978 2 scruples troy drams 0.333 sections (US) square kilometers 2.589 988 1 sections (US) square statute miles 1 spans centimeters 22.86 spans inches 9 steres cubic meters 1 steres cubic yards 1.307 95 tablespoons milliliters 14.786 76 tablespoons teaspoons 3 teaspoons milliliters 4.928 922 teaspoons tablespoons 0.333 333 ton-miles, long metric ton-kilometers 1.635 169 ton-miles, short metric ton-kilometers 1.459 972 tons, gross register cubic feet of permanently enclosed space 100 tons, gross register cubic meters of permanently enclosed space 2.831 684 7 tons, long (deadweight) avoirdupois ounces 35,840 tons, long (deadweight) avoirdupois pounds 2,240 tons, long (deadweight) kilograms 1,016.046 909 8 tons, long (deadweight) long hundredweights 20 tons, long (deadweight) metric tons 1.016 046 908 8 tons, long (deadweight) short hundredweights 22.4 tons, long (deadweight) short tons 1.12 tons, metric avoirdupois pounds 2,204.623 tons, metric kilograms 1,000 tons, metric long hundredweights 19.684 130 3 tons, metric long tons 0.984 206 5 tons, metric quintals 10 tons, metric short hundredweights 22.046 23 tons, metric short tons 1.102 311 3 tons, metric troy ounces 32,150.75 tons, net register cubic feet of permanently enclosed space for cargo and passengers 100 tons, net register cubic meters of permanently enclosed space for cargo and passengers 2.831 684 7 tons, shipping cubic feet of permanently enclosed cargo space 42 tons, shipping cubic meters of permanently enclosed cargo space 1.189 307 574 tons, short avoirdupois pounds 2,000 tons, short kilograms 907.184 74 tons, short long hundredweights 17.857 14 tons, short long tons 0.892 857 1 tons, short metric tons 0.907 184 74 tons, short short hundredweights 20 townships (US) sections 36 townships (US) square kilometers 93.239 572 townships (US) square statute miles 36 miles, square statute acres 640 miles, square statute hectares 258.998 811 033 6 miles, square statute square feet 27,878,400 miles, square statute square meters 2,589,988.110 336 miles, square statute square yards 3,097,600 yards centimeters 91.44 yards feet 3 yards inches 36 yards meters 0.914 4 yards miles 0.000 568 18 yards, cubic bushels 21.696 227 yards, cubic cubic feet 27 yards, cubic cubic inches 46,656 yards, cubic cubic meters 0.764 554 857 984 yards, cubic gallons 201.974 0 yards, cubic liters 764.554 857 984 yards, cubic pecks 86.784 91 yards, square acres 0.000 206 611 6 yards, square hectares 0.000 083 612 736 yards, square square centimeters 8,361.273 6 yards, square square feet 9 yards, square square inches 1,296 yards, square square meters 0.836 127 36 yards, square square miles 0.000 000 322 830 6
This page was last updated on 21 February, 2008
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