Length Standard measure 1 mile = 1760 yards = 5280 feet 1 yard = 3 feet = 36 inches 1 rod = 5.5 yards = 16.5 feet 1 hand = 4 inches 1 span = 9 inches 1 light year = 5 878 500 000 000 miles 1 kilometres = 1000 metres 1 metre = 1000 millimetres 1 metre = 10 decimetres 1 decimetre = 10 centimetres 1 centimetre = 10 millimetres 1 light year = 9 465 000 000 000 000 metres Surveyor's measure 1 mile = 8 furlongs = 80 chains 1 furlong = 10 chains = 220 yards 1 chain = 4 rods = 22 yards = 100 links 1 link = 7.92 inches Nautical measure 1 league = 3 nautical miles 1 nautical mile = 1.1508 statute miles 1 degree (@ equator) = 60 nautical miles 120 fathoms = 1 cable 1 fathom = 2 yards = 6 feet Conversion factors 1 mile = 1.6093 kilometres : 1 kilometre = 0.62139 miles 1 yard = 0.9144 metres : 1 metre = 1.0936 yards 1 foot = 0.3048 metres : 1 metre = 3.2808 feet 1 inch = 25.4 millimetres : 1 millimetre = 0.03937 inches Area 1 square mile = 640 acres 1 acre = 10 square chains 1 square chain = 16 square rods 1 square rod = 30.25 square yards 1 square yard = 9 square feet 1 square foot = 144 square inches 1 circular inch = 0.7854 square inches 1 square kilometre=100 hectares 1 hectare = 100 ares 1 are = 100 square metres 1 square metre = 100 square decimetres 1 square decimetre = 100 square centimetres 1 square centimetre = 100 square millimetres Conversion factors 1 square mile = 2.5899 square kilometres : 1 square kilometre = 0.3861 square miles 1 acre = 0.4047 hectares : 1 hectare = 2.471 acres 1 square yard = 0.836 square metres : 1 square metre = 1.196 square yards 1 square foot = 0.0929 square metres : 1 square metre = 10.764 square feet 1 square inch = 645.2 square millimetres : 1 square millimetre = 0.00155 square inches Volume Standard measure 1 cubic yard = 27 cubic feet 1 cubic foot = 1728 cubic inches 1 cord (wood) = 4 x 4 x 8 foot 1 perch (masonry) = 16.5 x 1.5 x 1 foot Shipping measure 1 register ton = 100 cubic feet 40 cubic feet = 32.143 US bushels 40 cubic feet = 31.16 imperial bushels Dry measure 1 US bushel = 1 winchester struck bushel 1 US bushel = 1.2445 cubic feet 1 US bushel = 4 pecks = 32 quarts 1 peck = 8 quarts = 16 pints 1 heaped bushel = 1.25 struck bushels 1 UK bushel = 8 imperial gallons Liquid measure 1 US gallon = 4 quarts = 8 pints 1 quart = 2 pints = 8 gills 1 UK gallon = 1.2009 US gallons Old liquid measure 1 tun = 2 pipes = 3 puncheons 1 pipe = 1 butt = 2 hogsheads = 4 barrels 1 puncheon = 2 tierces = 84 gallons 1 tierce = 42 gallons 1 barrel = 31.5 gallons Apothecaries fluid measure 1 US fluid ounce = 8 drachms 1 fluid drachm = 60 mimims 1 US fluid ounce = 1.805 cubic inches 1 UK fluid ounce = 1.732 cubic inches Cubic measure 1 cubic metre = 1000 cubic decimetres 1 cubic metre = 1000000 cubic millimetres 1 cubic decimetre = 1000 cubic centimetres 1 cubic centimetre = 1000 cubic millimetres Dry and liquid measure 1 hectolitre = 100 litres 1 litre = 10 decilitres 1 decilitre = 10 centiletres 1 centilitres = 10 millilitres 1 litre = 1 cubic decimetre 1000 litres = 1 cubic metre Conversion factors 1 cubic yard = 0.7646 cubic metres : 1 cubic metre = 1.308 cubic yards 1 cubic foot = 0.02832 cubic metres : 1 cubic metre = 35.315 cubic feet 1 cubic inch = 16387.064 cubic millimetres : 1 cubic millimetre = 0.00006102 cubic inches 1 cubic foot = 28.137 litres : 1 litre = 0.0353 cubic feet 1 US gallon = 3.785 litres : 1 litre = 0.2642 US gallons 1 UK gallon = 4.5454 litres : 1 litre = 0.22 UK gallons Velocity / Acceleration 1 mile/hour = 1.4666 feet/sec 1 foot/minute = 0.2 inches/second 1 knot = 1 nautical mile/hour 1 cycle/second = 1 hertz 1 metre/sec = 3.6 kilometres/hour 1 revolution/minute = 0.104 radians/second (Acceleration) gravity = 9.81 metres/second² Conversion factors 1 mile/hour = 1.609 kilometres/hour : 1 kilometres/hour = 0.62139 miles/hour 1 foot/second = 0.3048 metres/second : 1 metre/second = 3.2808 feet/second 1 knot = 1.852 kilometres/hour : 1 kilometre/hour = 0.5399 knots Weight / Mass Avoirdupois measure 1 gross ton = 1 long ton = 2240 pounds 1 net ton = 1 short ton = 2000 pounds 1 pound = 16 ounces = 7000 grains 1 ounce = 16 drachms = 437.5 grains 1 long ton = 20 hundredweight 1 hundredweight = 4 quarters = 112 pounds 1 quarter = 2 stone = 28 pounds 1 quintal = 100 pounds Troy weight (measure of gold and silver) 1 pound = 12 ounces = 5760 grains 1 ounce = 20 pennyweights = 480 grains 1 pennyweight = 24 grains 1 carat (diamond) = 3.086 grains Apothecaries weight 1 pound = 12 ounces = 5760 grains 1 ounce = 8 drachms = 480 grains 1 drachm = 3 scruples = 60 grains 1 scruple = 20 grains Standard measure 1 tonne = 1 metric ton 1 tonne = 1000 kilograms 1 kilograms = 1000 grams 1 centigram = 10 milligrams 1 decigram = 10 centigrams 10 decigrams = 1 gram 10 grams = 1 dekagram 10 dekagrams = 1 hectogram 10 hectograms = 1 kilogram Conversion factors 1 long ton = 1.016 tonnes : 1 tonne = 0.9842 tons (long) 1 short ton = 0.9071 tonnes : 1 tonne = 1.1024 tons (short) 1 pound = 0.4536 kilograms : 1 kilogram = 2.2046 pounds (avoirdupois) 1 grain = 0.0648 grams : 1 gram = 15.432 grains 1 grain (avoidupois) = 1 grain (troy) = 1 grain (apothecaries) Pressure / Force 1 atmosphere = 14696 psi (pound/inch²) 1 psi = 144 pounds/square foot 1 psi = 2.042 inches Hg (mecury) @ 62° F 1 psi = 27.7 inches H2O (water) @ 62° F megapascal = 1000 kilopascals 1 kilopascal = 1000 pascals 1 bar = 1 megapascal 1 Newton = 1 kilogram x 9.81 Conversion factors 1 atmosphere = 101.325 kilopacsals : 1 kilopascal = 0.00986 atmospheres 1 psi = 6.894 kilopascals : 1 kilopascal = 0.1382 psi 1 kilogram/square millimetre = 1422.32 psi : 1 psi = 0.7031 grams/square millimetre 1 kilogram-metre = 7.233 foot-pounds : 1 foot-pound = 0.1382 kilogram-metres 1 UK tonf = 9.964 kilonewtons : 1 kilonewton = 0.1004 UK ton (force) 1 US tonf = 8.896 kilonewtons : 1 kilonewton = 0.1124 US ton (force) 1 pound(force) = 4.4482 Newtons : 1 Newton = 0.2248 pounds(force) Time 1 solar year = average interval between 2 successive returns of the sun to the first point of Aries. 1 sireal year = average period of revolution of the Earth with respect to the fixed stars. 1 anomalistic year = average interval between successive perihelions 1 solar year (1 astronomical year) = 365.242 mean solar days 1 sireal year = 365.256 mean solar days 1 anomalistic year = 365.259 mean solar days 1 calendar year = 365.25 mean solar days 1 solar day = interval between 2 successive returns of the sun to the meridian 1 mean solar day = average length of solar day over 1 year 1 second = time equal to the duration of 9,192,631,770 periods of radiation corresponding to the transition of the ground state of the Caesium-133 atom. 1 lustrum = 5 years Old English standard 1 moment = 1.5 minutes Work / Energy / Power 1 horsepower/hour = 2545 British thermal units 1 British thermal unit = 778 foot-pounds 1 kilowatt/hours = 3600 kilojoules 1 kilowatt = 1 kilojoule/sec Conversion factors 1 horsepower/hour = 0.746 kilowatt/hours : 1 kilowatt/hour = 1.34 horsepower/hours 1 horsepower = 746 watts : 1 watt = 0.00134 horsepower 1 British thermal unit = 0.252 calories (kilogram calorie) Temperature Boiling point of water = 212° Fahrenheit Freezing point of water = 32° Fahrenheit Boiling point of water = 100° Celsius Freezing point of water = 0° Celsius 1 Celsius degree = 1 Kelvin degree 0 Kelvin = absolute zero Conversion factors Fahrenheit to Celsius = (5/9)x(tF-32) Fahrenheit to Kelvin = (5/9)x(tF + 459.67) Celsius to Fahrenheit = (9/5 x tC)+32 Celsius to Kelvin = tC + 273.15 |

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