Template:Unit area/doc

Usage
This template displays area 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 the output).

It can display and convert following units:
 * m2 to sq ft (square metres to square feet) and vice-versa
 * ha to acres (hectares to acres) and vice-versa
 * km2 to sq mi (square kilometres to square miles) and vice-versa

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