Italy uses the metric system of weights and measures, which is called the International System of Units (SI).

1inch = 2.54cm
1cm = 0.39inches
1m = 3.3 ft
1ft = 0.3 m
1km = 0.62 miles
1 mile = 1.6 km
1kg = 2.2lb
1lb = 0.45kg
1g = 0.035oz

(Source: http://www.allmeasures.com)