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unit of measure of the length (U.S.)

inches links foots yards rods chains miles centimeters meters
inch 1 0.126263 0.083333 0.027777 0.005050 0.001262 0.000015 2.540005 0.0254
link 7.92 1 0.66 0.22 0.04 0.01 0.000125 20.11684 0.201168
foot 12 1.515152 1 0.333333 0.060606 0.015151 0.000189 30.48006 0.304800
yard 36 4.54545 3 1 0.181818 0.045454 0.000568 91.44018 0.914401
rod 198 25 16.5 5.5 1 0.25 0.003125 502.9210 5.029210
chain 792 100 66 22 4 1 0.0125 2011.684 20.11684
mile 63360 8000 5280 1760 320 80 1 160934.72 1609.3472
centimeter 0.3937 0.049709 0.032808 0.010936 0.001988 0.000497 0.000006 1 0.01
meter 39.37 4.970960 3.280833 1.093611 0.198838 0.049709 0.000621 100 1

1 inch (in.) = 25.4001 mm
1 foot (ft.) = 0.304801 m
1 yarde (yd.) = 0.914402 m
1 rod (rd.) = 5.02921 m
1 mile (mi.) = 1.609347 Km 		1 millimeter = 0.03937 in.
1 meter = 3.28083 ft.
1 meter = 1.093611 yd.
1 meter = 0.198838 rd.
1 Kilometer = 0.621370 mi.

List of the conversions compares with the units of 1 meter of the principal units of Anglo-Saxon and Italian measure (also not more in use)
angström (Å) = 1*10-10 point = 0.351459*10-3
light year = 9.46055*1015 punto (p) = 0.37606*10-3
bolt = 36.576 quadrimicron = 1*10-15
cable = 185.2 quintimicron = 1*10-18
chain = 30.48 saschen = 2.133562
cicero = 4.512*10-3 siriometer = 1.4959*1017
dalton = 1.650*10-27 skein = 109.728
ell = 1.143 span = 0.2286
fathom (fm) = 1.8288 trimicron = 1*10-12
fermi = 1*10-15 astronomical unit (u.a.) = 1.4959*1011
furlong (fur) = 201.1684 x unit (UX) = 1.00202*10-13
hand = 0.1016 varas = 0.848174
leaughe (marine) = 5.556*103 versta = 1066.781
line = 0.635*10-3 ximicron = 1*10-12
marine mile (intern.) = 1852
knot = 1853.181
pace = 0.0762
parsec (pc) = 3.08374*1016
perm (pm) = 1*10-4
pica (em) = 4.21751*10 -3

For calculate the astronomic distances they are used particular measures:

astronomical unit (U.A.) = medium distance earth-sun, correspondent to appr. 149 500 000 Km (are used in the measures of the solar system).

light year = distance covered from the light in a year (vel. light ~300 000 km to sec. that it corresponds to 9 million million km.). It is equivalent to 63 000 U.A., therefore 63 000 times the earth-sun distance.

parsec = 3,2558 light years. It is represented from the distance to which the beam of the orbit of the Earth (approximately the medium distance earth-sun) appears under an angle of 1 ".

ancient measures of Roman length

1 foot = 0.296 m
1 passus = 5 foot = 1.48 m
1 stadium = 125 passus = 185 m
1 mile = 8 stadium = 1480 m

nautical measures

6 foots = 1 fathom
100 fathoms = 1 cable length
6000 foot = 1 nautical mile

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(ver. 11.02.02 )