As the US doesn't seem to be willing to adopt the metric system in the foreseeable future, we're stuck with imperial measurements even after the empire has gone metric. It can also be noted that UrW uses a somewhat odd rounding up system, which means that you can't know the correct measurement anyway.

You'll probably have to learn to use the more common imperial units eventually, or struggle with every game aimed at the US market. Note that this doesn't mean I wouldn't welcome the metric measurements in UrW, but given that the imperial ones is a mess of arbitrary values with limited relations to each other (as opposed to the metric one, where the values are arbitrary, but the relations are in powers of 10), you'd get even weirder values in the game if metric, as the base units will have to stay the same regardless of the display.

1 pound (lbs) = 454 grams, i.e. a little under ½ kg

1 inch = 2.54 cm (don't think this unit is used in UrW)

12 inches = 1 foot (ft) = 30.48 cm, or about 1/3 of a meter (when using 30 cm as an approximation for the height of people, the 0.48 cm parts add up, so someone who's 6 ft 2 inches tall is roughly an inch taller than the 180 cm plus the inch part of about 5 cm would indicate, or you could just add half a cm per foot)

3 feet = 1 yard, i.e. a little shorter than a meter (don't think this unit is used in UrW)

1 (English) mile = 1609.3 meters, i.e. a bit over 1½ km (not used in UrW, and no even relation to the smaller length measurements)