Convert a value in kilograms to pounds. Simply doubles the value, because that's what the game goes, for real!
Example:
Jaheira's weight is 75 kg ({{kg to lb|75}} lb).
Result:
Jaheira's weight is 75 kg (150 lb).
This is mainly for using in other templates that automatically do such conversion.
It wouldn't exactly be difficult to do {{#expr: kg_value * 2}} every time manually, but then you would need to explain in a comment every time that simply doubling the value is indeed the right thing to do! Doing it centrally with a template lets us have one place to explain this weirdness and hide away the dirt.