By 1812, all of Italy from Rome northwards was under the control of Napoleon, either as French Departments or as part of the Kingdom of Italy ensuring the metric system was in use throughout this region.
至1812年，整个意大利从罗马向北都在拿破仑的控制之下，无论是作为法兰西的一部分或作为意大利王国的一部分，确保了公制在整个地区内的使用。