[U.S. equivalents of the metric below]
UNIT | ABBREVIATION OR SYMBOL |
EQUIVALENTS IN OTHER UNITS OF SAME SYSTEM | METRIC EQUIVALENT |
WEIGHT | |||
---|---|---|---|
Avoirdupois2 | |||
ton | |||
short ton | 20 short hundredweight, 2000 pounds | 0.907 metric ton | |
long ton | 20 long hundredweight, 2240 pounds | 1.016 metric ton | |
hundredweight | cwt | ||
short hundredweight | 100 pounds, 0.05 short tons | 45.359 kilograms | |
long hundredweight | 112 pounds, 0.05 long ton | 50.802 kilograms | |
pound | lb or lb avdp also # | 16 ounces, 7000 grains | 0.454 kilogram |
ounce | oz or oz avdp | 16 drams, 437.5 grains, 0.0625 pound | 28.350 grams |
dram | dr or dr avdp | 27.344 grains, 0.0625 ounce | 1.772 grams |
grain | gr | 0.037 dram, 0.002286 ounce | 0.0648 gram |
Troy | |||
pound | lb t | 12 ounces, 240 pennyweight, 5760 grains | 0.373 kilogram |
ounce | oz t | 20 pennyweight, 480 grains, 0.083 pound | 31.103 grams |
pennyweight | dwt also pwt | 24 grains, 0.05 ounce | 1.555 grams |
grain | gr | 0.042 pennyweight, 0.002083 ounce | 0.0648 gram |
Apothecaries' | |||
pound | lb ap | 12 ounces, 5760 grains | 0.373 kilogram |
ounce | oz ap | 8 drams, 480 grains, 0.083 pound | 31.103 grams |
dram | dr ap | 3 scruples, 60 grains | 3.888 grams |
scruple | s ap | 20 grains, 0.333 dram | 1.296 grams |
grain | gr | 0.05 scruple, 0.002083 ounce, 0.0166 dram | 0.0648 gram |
CAPACITY | |||
U.S. liquid measure | |||
gallon | gal | 4 quarts (231 cubic inches) | 3.785 liters |
quart | qt | 2 pints (57.75 cubic inches) | 0.946 liter |
pint | pt | 4 gills (28.875 cubic inches | 473.176 milliliters |
gill | gi | 4 fluid ounces (7.219 cubic inches) | 118.294 milliliters |
fluid ounce | fl oz | 8 fluid drams (1.805) cub inches) | 29.573 milliliters |
fluid dram | fl dr | 60 minims (0.226 cubic inch) | 3.697 milliliters |
minim | min | 1/60 fluid dram (0.003760 cubic inch) | 0.061610 milliliter |
U.S. dry measure | |||
bushel | bu | 4 pecks (2150.42 cubic inches) | 35.239 liters |
peck | pk | 8 quarts (537.605 cubic inches) | 8.810 liters |
quart | qt | 2 pints (67.201 cubic inches) | 1.101 liters |
pint | pt | ? quart (33.600 cubic inches) | 0.551 liter |
British imperial liquid and dry measure | |||
bushel | bu | 4 pecks (2219.36 cubic inches) | 36.369 liters |
peck | pk | 2 gallons (554.84 cubic inches) | 9.092 liters |
gallon | gal | 4 quarts (277.420 cubic inches) | 4.546 liters |
quart | qt | 2 pints (69.355 cubic inches) | 1.136 liters |
pint | pt | 4 gills (34.678 cubic inches) | 568.26 milliliters |
gill | gi | 5 fluid ounces (8.669 cubic inches) | 142.066 milliliters |
fluid ounce | fl oz | 8 fluid drams (1.7339 cubic inches) | 28.412 milliliters |
fluid dram | fl dr | 60 minims (0.216734 cubic inch) | 3.5516 milliliters |
minim | min | 1/60 fluid dram (0.003612 cubic inch) | 0.059194 milliliter |
LENGTH | |||
mile | mi | 5280 feet, 1760 yards, 320 rods | 1.609 kilometers |
rod | rd | 5.50 yards, 16.5 feet | 5.029 meters |
yard | yd | 3 feet, 36 inches | 0.9144 meter |
foot | ft or ' | 12 inches, 0.333 yard | 30.48 centimeters |
inch | in or " | 0.083 foot, 0.028 yard | 2.54 centimeters |
AREA | |||
square mile | sq mi or mi2 | 640 acres, 102,400 square rods | 2.590 square kilometers |
acre | 4840 square yards, 43,560 square feet | 0.405 hectare, 4047 square meters | |
square rod | sq rd or rd2 | 30.35 square yards, 0.00625 acre | 25.293 square meters |
square yard | sq yd or yd2 | 1296 square inches, 9 square feet | 0.836 square meter |
square foot | sq ft or ft2 | 144 square inches, 0.111 square yard | 0.093 square meter |
square inch | sq in or in2 | 0.0069 square foot, 0.00077 square yard | 6.452 square centimeters |
VOLUME | |||
cubic yard | cu yd or yd3 | 27 cubic feet, 46,656 cubic inches | 0.765 cubic meter |
cubic foot | cu ft or ft3 | 1728 cubic inches, 0.0370 cubic yard | 0.028 cubic meter |
cubic inch | cu in or in3 | 0.00058 cubic foot, 0.000021 cubic yard | 16.387 cubic centimeters |
1For U.S. equivalents of the metric unit see Metric System table below.
2The U.S. uses the avoirdupois units as a common system of measuring weight.
Metric System
LENGTH | ||||||
Unit | Abbreviation | Number of Meters | Approximate U.S. Equivalent | |||
kilometer | km | 1,000 | 0.62 mile | |||
hectometer | hm | 100 | 328.08 feet | |||
dekameter | dam | 10 | 32.81 feet | |||
meter | m | 1 | 39.37 inches | |||
decimeter | dm | 0.1 | 3.94 inches | |||
centimeter | cm | 0.01 | 0.39 inch | |||
millimeter | mm | 0.001 | 0.039 inch | |||
micrometer | µm | 0.000001 | 0.000039 inch | |||
AREA | ||||||
Unit | Abbreviation | Number of Square Meters | Approximate U.S. Equivalent | |||
square kilometer | sq km or km2 | 1,000,000 | 0.3861 square miles | |||
hectare | ha | 10,000 | 2.47 acres | |||
are | a | 100 | 119.60 square yards | |||
square centimeter | sq cm or cm2 | 0.0001 | 0.155 square inch | |||
VOLUME | ||||||
Unit | Abbreviation | Number of Cubic Meters | Approximate U.S. Equivalent | |||
cubic meter | m3 | 1 | 1.307 cubic yards | |||
cubic decimeter | dm3 | 0.001 | 61.023 cubic inches | |||
cubic centimeter | cu cm or cm3 also cc | 0.000001 | 0.061 cubic inch | |||
CAPACITY | ||||||
Unit | Abbreviation |
Number of | Approximate U.S. Equivalent | |||
cubic | dry | liquid | ||||
kiloliter | kl | 1,000 | 1.31 cubic yards | |||
hectoliter | hl | 100 | 3.53 cubic feet | 2.84 bushels | ||
dekaliter | dal | 10 | 0.35 cubic foot | 1.14 pecks | 2.64 gallons | |
liter | l | 1 | 61.02 cubic inches | 0.908 quart | 1.057 quarts | |
cubic decimeter | dm3 | 1 | 61.02 cubic inches | 0.908 quart | 1.057 quarts | |
deciliter | dl | 0.10 | 6.1 cubic inches | 0.18 pint | 0.21 pint | |
centiliter | cl | 0.01 | 0.61 cubic inch | 0.338 fluid ounce | ||
milliliter | ml | 0.001 | 0.061 cubic inch | 0.27 fluid dram | ||
microliter | µl | 0.000001 | 0.000061 cubic inch | 0.00027 fluid dram | ||
MASS AND WEIGHT | ||||||
Unit | Abbreviation | Part of gram | Number of Grams | Approximate U.S. Equivalent | ||
metric ton | t |
- | 1,000,000 | 1.102 short tons | ||
kilogram | kg |
- | 1,000 | 2.2046 pounds | ||
hectogram | hg |
- | 100 | 3.527 ounces | ||
dekagram | dag |
- | 10 | 0.353 ounce | ||
gram | g |
- | 1 | 0.035 ounce | ||
decigram | dg | tenth | 0.10 | 1.543 grains | ||
centigram | cg | hundredth | 0.01 | 0.154 grain | ||
milligram | mg | thousandth | 0.001 | 0.015 grain | ||
microgram | µg | millionth | 0.000001 | 0.000015 grain | ||
nanogram | ng | billionth | 0.000000001 | 0.000000015 grain | ||
picogram | pg | trillionth | 0.000000000001 | 0.000000000015 grain | ||
femtogram | fg | quadrillionth | 0.000000000000001 | 0.000000000000015 grain | ||
attogram | ag |
? | 0.000000000000000001 | 0.000000000000000015 grain |
DENOMINATIONS ABOVE ONE MILLION | |||||||
---|---|---|---|---|---|---|---|
American System1 | British System1 | ||||||
NAME | VALUE IN POWERS OF TEN |
NUMBER OF ZEROS2 |
NUMBER OF GROUPS OF THREE 0'S AFTER 1,000 |
NAME | VALUE IN POWERS OF TEN |
NUMBER OF ZEROS2 |
POWERS OF 1,000,000 |
billion | 109 | 9 | 2 | milliard | 109 | 9 | -- |
trillion | 1012 | 12 | 3 | billion | 1012 | 12 | 2 |
quadrillion | 1015 | 15 | 4 | trillion | 1018 | 18 | 3 |
quintillion | 1018 | 18 | 5 | quadrillion | 1024 | 24 | 4 |
sextillion | 1021 | 21 | 6 | quintillion | 1030 | 30 | 5 |
septillion | 1024 | 24 | 7 | sextillion | 1036 | 36 | 6 |
octillion | 1027 | 27 | 8 | septillion | 1042 | 42 | 7 |
nonillion | 1030 | 30 | 9 | octillion | 1048 | 48 | 8 |
decillion | 1033 | 33 | 10 | nonillion | 1054 | 54 | 9 |
undecillion | 1036 | 36 | 11 | decillion | 1060 | 60 | 10 |
duodecillion | 1039 | 39 | 12 | undecillion | 1066 | 66 | 11 |
tredecillion | 1042 | 42 | 13 | duodecillion | 1072 | 72 | 12 |
quattuordecillion | 1045 | 45 | 14 | tredecillion | 1078 | 78 | 13 |
quindecillion | 1048 | 48 | 15 | quattuordecillion | 1084 | 84 | 14 |
sexdecillion | 1051 | 51 | 16 | quindecillion | 1090 | 90 | 15 |
septendecillion | 1054 | 54 | 17 | sexdecillion | 1096 | 96 | 16 |
octodecillion | 1057 | 57 | 18 | septendecillion | 10102 | 102 | 17 |
novemdecillion | 1060 | 60 | 19 | octodecillion | 10108 | 108 | 18 |
vigintillion | 1063 | 63 | 20 | novemdecillion | 10114 | 114 | 19 |
centillion | 10303 | 303 | 100 | vigintillion | 10120 | 120 | 20 |
centillion | 10600 | 600 | 100 |
1The American system of numeration for denominations above one million was modeled on the French system but more recently the French system has been changed to correspond to the German and British systems. In the American system each of the denominations above 1,000 millions (the American billion) is 1,000 times the preceding one (one trillion = 1,000 billions; one quadrillion = 1,000 trillions). In the British system the first denomination above 1,000 millions (the British milliard) is 1,000 times the preceding one, but each of the denominations above 1,000 milliards (the British billion) is 1,000,000 times the preceding one (one trillion = 1,000,000 billions; one quadrillion = 1,000,000 trillions).
2For convenience in reading large numerals, the thousands, millions, etc., are usually separated by commas (21,530; 1,155,465) or especially in technical contexts by spaces (1 155 465). Serial numbers (as social security numbers are usually written with hyphens (042-24-4705).
source: http://www.webster.com/mw/table/number.htm 4jul01