Template:Unit length/doc

Usage
This template displays length (or height, it is aliased as Unit height) measurement units used within various Category:Geobox templates, automatically converting between metric/imperial values. The input must be unformatted numeric values (i.e. without commas, the commas are automatically added to output).

It can display and convert following units:
 * m to ft (metres to feet) and vice-versa
 * km to mi (kilometres to miles) and vice-versa
 * mm to in (milimetres to inches) and vice-versa

The template has 3 unnamed parameters: '''. Their meaning is as follows:
 * 1) unit … unit  of the   parameter, it will get displayed first
 * 2) value … numerical value
 * 3) round … number of decimal digits (negative numbers can be used for rounded figures); if not specified 0 is assumed