var unitID = "length";
var defaultUnitIndex = 18;

var units = [
  ["ångströms [Å]",                   1e-10],
  ["astronomical units [AU]",         149598550000],
  ["barleycorns",                     0.008467],
  ["cables",                          182.88],
  ["centimeters [cm]",                0.01],
  ["chains (surveyors')",             20.116840233680467360934721869444],
  ["decimeters",                      0.1],
  ["ells (UK)",                       0.875],
  ["ems (pica)",                      0.0042333],
  ["fathoms",                         1.8288],
  ["feet (UK and US)",                0.3048],
  ["feet (US survey)",                0.30480060960121920243840487680975],
  ["furlongs",                        201.168],
  ["hands",                           0.1016],
  ["hectometers [hm]",                100],
  ["inches [in]",                     0.0254],
  ["kilometers [km]",                 1000],
  ["light years",                     9.460528405e15],
  ["meters [m]",                      1],
  ["micrometers [µm]",                1e-6],
  ["mil",                             0.0000254],
  ["miles (UK and US)",               1609.344],
  ["miles (nautical, international)", 1852],
  ["miles (nautical, UK)",            1853.184],
  ["millimeters [mm]",                0.001],
  ["nanometers [nm]",                 1e-9],
  ["parsecs",                         3.0856776e16],
  ["picometers",                      1e-12],
  ["thou",                            0.0000254],
  ["yards",                           0.9144]
];