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Dictionary of Units / Measurements

# Length Unit

The S I unit of length is the metre. To change any of these other units of length into their equivalent values in metres use the operation and conversion factor given. Those marked with # are exact. Other values are given to an appropriate degree of accuracy. Where some uncertainty is indicated it means that a good idea of the size of the unit can be given but that a better value would depend upon knowing the period and/or culture in which the unit was being used.

Note than in matters concerned with land measurements, for the most accurate work, it is necessary to establish whether the US survey measures are being used or not.

 angstroms              divide by 10 000 000 000 # astronomical units     x 149 598 550 000 barleycorns            x 0.008 467 centimeters            x 0.01 # chains (surveyors')    x 20.1168 # cubits                 x (0.45 to 0.5) ells (UK)              x 0.875 (but many variations) ems (pica)             x 0.004 233 3 fathoms                x 1.8288 # feet (UK and US)       x 0.3048 # feet (US survey)       x 0.304 800 609 6 furlongs               x 201.168 # hands                  x 0.1016 # inches                 x 0.0254 # kilometers             x 1000 # leagues                x (4000 to 5000) light years            x 9 460 500 000 000 000 links (surveyors')     x 0.201 168 #   metres [m]             1 microns (=micrometers) x 0.000 001 # miles (UK and US)      x 1609.344 # miles (nautical)       x 1852 # parsecs                x 30 856 770 000 000 000 perch (=rods or poles) x 5.0292 # picas (computer)       x 0.004 233 333 picas (printers')      x 0.004 217 518 points (computer)      x 0.000 352 777 8 points (printers')     x 0.000 351 459 8 yards                  x 0.9144 #