# The World Factbook (1990)/Weights and Measures

Appendix D:

Weights and Measures

Mathematical Notation
 Mathematical Power Name .mw-parser-output .nowrap,.mw-parser-output .nowrap a:before,.mw-parser-output .nowrap .selflink:before{white-space:nowrap}1018 or 1,000,000,000,000,000,000⁠ one quintillion 1015 or 1,000,000,000,000,000 one quadrillion 1012 or 1,000,000,000,000 one trillion 109 or 1,000,000,000 one billion 106 or 1,000,000 one million 103 or 1,000 one thousand 102 100 one hundred 101 or 10 ten 100 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
 Conversions from a multiple or submultiple to the basic units of meters, liters, or grams can be done using the table. For example, to convert from kilometers to meters, multiply by 1,000 (9.26 kilometers equals 9,260 meters) or to convert from meters to kilometers, multiply by 0.001 (9,260 meters equals 9.26 kilometers) Prefix Symbol Length,weight,capacity Area Volume exa E 1018 1036 1054 peta P 1015 1030 1045 tera T 1012 1024 1036 giga G 109 1018 1027 mega M 106 1012 1018 hectokilo hk 105 1010 1015 myria ma 104 108 1012 kilo k 103 106 109 hecto h 102 104 106 deka da 101 102 103 basic unit — 1 meter, 1 meter2 1 meter3 1 gram, 1 liter deci d 10-1 10-2 10-3 centi c 10-2 10-4 10-6 milli m 10-3 10-6 10-9 decimilli dm 10-4 10-8 10-12 centimilli cm 10-5 10-10 10-15 micro u 10-6 10-12 10-18 nano n 10-9 10-18 10-27 pico p 10-12 10-24 10-36 femto f 10-15 10-30 10-45 atto a 10-18 10-36 10-54

Equivalents
 Unit Metric Equivalent US Equivalent acre 0.404 685 64 hectares 43,560 feet2 acre 4,046.856 4 meters2 4,840 yards2 acre 0.004 046 856 4 kilometers2 0.001 562 5 miles2, statute are 100 meters2 119.599 yards2 barrel (petroleum, US) 158.987 29 liters 42 gallons barrel (proof spirits, US) 151.416 47 liters 40 gallons barrel (beer, US) 117.347 77 liters 31 gallons bushel 35.239 07 liters 4 pecks cable 219.456 meters 120 fathoms chain (surveyor's) 20.116 8 meters 66 feet cord (wood) 3.624 556 meters3 128 feet3 cup 0.236 588 2 liters 8 ounces, liquid degrees, celsius (water boils at 100°C,freezes at 0°C) multiply by 1.8 and add 32to obtain °F degrees, fahrenheit subtract 32 and divideby 1.8 to obtain °C (water boils at 212°F,freezes at 32°F) dram, avoirdupois 1.771 845 2 grams 0.062 5 ounces, avoirdupois dram, troy 3.887 934 6 grams 0.125 ounces, troy dram, liquid (US) 3.696 69 milliliters 0.125 ounces, liquid fathom 1.828 8 meters 6 feet foot 30.48 centimeters 12 inches foot 0.304 8 meters 0.333 333 3 yards foot 0.000 304 8 kilometers 0.000 189 39 miles, statute foot2 929.030 4 centimeters2 144 inches2 foot2 0.092 903 04 meters2 0.111 111 1 yards2 foot3 28.316 846 592 liters 7.480 519 gallons foot3 0.028 316 847 meters3 1,728 inches3 furlong 201.168 meters 220 yards gallon, liquid (US) 3.785 411 784 liters 4 quarts, liquid gill (US) 118.294 118 milliliters 4 ounces, liquid grain 64.798 91 milligrams 0.002 285 71 ounces, avdp. gram 1,000 milligrams 0.035 273 96 ounces, avdp. hand (height of horse) 10.16 centimeters 4 inches hectare 10,000 meters2 2.471 053 8 acres hundredweight, long 50.802 345 kilograms 112 pounds, avoirdupois hundredweight, short 45.359 237 kilograms 100 pounds, avoirdupois inch 2.54 centimeters 0.083 333 33 feet inch2 6.451 6 centimeters2 0.006 944 44 feet2 inch3 16.387 064 centimeters3 0.000 578 7 feet3 inch3 16.387 064 milliliters 0.029 761 6 pints, dry inch3 16.387 064 milliliters 0.034 632 pints, liquid kilogram 0.001 tons, metric 2.204 623 pounds, avdp. kilometer 1,000 meters 0.621 371 19 miles, statute kilometer2 100 hectares 247.105 38 acres kilometer2 1,000,000 meters2 0.386 102 16 miles2, statute knot (1 nautical mi/hr) 1.852 kilometers/hour 1.151 statute miles/hour league, nautical 5.559 552 kilometers 3 miles, nautical league, statute 4.828 032 kilometers 3 miles, statute ​ link (surveyor's) 20.116 8 centimeters 7.92 inches liter 0.001 meters3 61.023 74 inches3 liter 0.1 dekaliter 0.908 083 quarts, dry liter 1,000 milliliters 1.056 688 quarts, liquid meter 100 centimeters 1.093 613 yards meter2 10,000 centimeters2 1.195 990 yards2 meter3 1,000 liters 1.307 951 yards3 micron 0.000 001 meter 0.000 039 4 inches mil 0.025 4 millimeters 0.001 inch mile, nautical 1.852 kilometers 1.150 779 4 miles, statute mile2, nautical 3.429 904 kilometers2 1.325 miles2, statute mile, statute 1.609 344 kilometers 5,280 feet or 8 furlongs mile2, statute 258.998 811 hectares 640 acres or 1 section mile2, statute 2.589 988 11 kilometers2 0.755 miles2, nautical minim (US) 0.061 611 52 milliliters 0.002 083 33 ounces, liquid ounce, avoirdupois 28.349 523 125 grams 437.5 grains ounce, liquid (US) 29.573 53 milliliters 0.062 5 pints, liquid ounce, troy 31.103 476 8 grams 480 grains pace 76.2 centimeters 30 inches peck 8.809 767 5 liters 8 quarts, dry pennyweight 1.555 173 84 grams 24 grains pint, dry (US) 0.550 610 47 liters 0.5 quarts, dry pint, liquid (US) 0.473 176 473 liters 0.5 quarts, liquid point (typographical) 0.351 459 8 millimeters 0.013 837 inches pound, avoirdupois 453.592 37 grams 16 ounces, avoirdupois pound, troy 373.241 721 6 grams 12 ounces, troy quart, dry (US) 1.101 221 liters 2 pints, dry quart, liquid (US) 0.946 352 946 liters 2 pints, liquid quintal 100 kilograms 220.462 26 pounds, avdp. rod 5.029 2 meters 5.5 yards scruple 1.295 978 2 grams 20 grains section (US) 2.589 988 1 kilometers2 1 mile2, statute or 640 acres span 22.86 centimeters 9 inches stere 1 meter3 1.307 95 yards3 tablespoon 14.786 76 milliliters 3 teaspoons teaspoon 4.928 922 milliliters 0.333 333 tablespoons ton, long or deadweight 1,016.046 909 kilograms 2,240 pounds, avoirdupois ton, metric 1,000 kilograms 2,204.623 pounds, avdp. ton, register 2.831 684 7 meters3 100 feet2 ton, short 907.184 74 kilograms 2,000 pounds, avoirdupois township (US) 93.239 572 kilometers2 36 miles2, statute yard 0.914 4 meters 3 feet yard2 0.836 127 36 meters2 9 feet2 yard3 0.764 554 86 meters3 27 feet3 yard3 764.554 857 984 liters 201.974 gallons