I think it would make a good addition to Humanizer if it was possible to humanize length just like time (as with TimeSpan).

Example of how the API could look like. I guess there are more to this feature but it is a start:

var value = 1280; // millimeters
value.ToLength(precision: 1, fromUnit: LengthUnit.Millimeters, minUnit: LengthUnit.Meter, maxUnit: LengthUnit.Meter);

value would become "1.3 m"