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1 centimetre = 10 mm
1 decimetre = 10 cm
 1 metre  =  100 cm
1 kilometre =  1,000 m

 1 foot = 12 inches
1 yard = 3 feet
1 (statute) mile= 1,760 yards
1 int. nautical mile= 1.150779 miles

1 square foot  =  144 sq. in.
1 square yard = 9 sq. ft
1 acre =  4,840 sq. yd 
1 square mile =  640 acres

1 square metre = 10,000 sq. cm
1 are = 119.6 sq. yards
1 are = 100 square metres
1 hectare = 100 ares = 2.471 acres
1 square kilometre = 100 hectares

1 cubic metre = 1,000,000 cu. cm 

1 US pint = 16 fluid oz 
1 gill = 5 fluid oz
1 pint = 20 fluid oz
1 quart = 2 pints
1 gallon = 4 quarts
1 peck = 2 gallons 
1 bushel = 4 pecks

1 centilitre = 10 ml = 0.018 pint
1 decilitre = 10 cl  = 0.176 pint
1 litre = 1000 ml = 1.76 pints
1 litre = 1 cubic decimetres
1 decalitre = 10 l = 2.20 gallons
1 hectolitre = 100 l = 2.75 bushels
1 kilolitre = 1,000 l = 3.44 quarters

stones: kilograms = 6.350
quarters: kilograms = 12.700
centals: kilograms = 45.359
hundredweights: kilograms = 50.802


1 milligram = 0.015 grain
1 centigram = 10 mg = 0.154 grain
1 decigram = 100 mg = 1.543 grains
1 gram = 1000 mg = 15.43 grains
1 decagram = 10 g = 5.64 drams
1 hectogram = 100 g = 3.527 ounces
1 kilogram = 1,000 g = 2.205 pounds
1 tonne (metric ton) = 0.9842 (long) ton= 1,000 kg

Troy Weight (Precious Metals) 
24 grains = 1 pennyweight 
20 pennyweights = 480 grains = 1 ounce 
12 ounces = 5760 = grains = 1 pound 

Apothecaries' Weight 
20 grains = 1 scruple 
3 scruples = 1 dram 
8 drams = 1 ounce 
12 ounces = 5760 grains = 1 pound 

  Archaic and less frequently used linear measure 
3 hands = 1 foot 
1 span 9 inches 
1 rod, pole or perch = 16.5 feet 
40 poles = 1 furlong  
8 furlongs = 1 mile
320 rods = 1 mile 
3 miles = 1 league
 
Nautical miles and Knots
10 cables = 1 nautical mile
6080 feet = 1 nautical mile
1 Knot = 1.151 mph 
The nautical mile is defined as the average distance on the earth's surface
 corresponding to an angle of 1 minute of arc. A speed of one nautical miles 
per hour is known as the knot. The International Nautical mile is accepted 
by the Royal Navy (1970) as being equal to 1852 metres.  As the earth is 
not a perfect sphere, but is an oblate spheroid, the distance corresponding 
to one minute of arc will vary depending on location. The value of 6080 feet 
is a compromise and is the value as measured at some point in the English 
channel

Depth
6 feet = 1 fathom 
15 fathom = 1 shackle

Power
horsepower - 745.7 Watts (SI) or 735.5 Watts (Continental Europe)