Why Doesn't the US Use the Metric System?

Sector Usage

In the United States, the use of metric and imperial units varies significantly across different sectors. Gary Arndt highlights that while science and pharmaceuticals predominantly use metric units, everyday activities like measuring distances between cities and selling gasoline remain imperial 1. He notes that the US is on a continuum of metric usage, similar to countries like Canada and the UK, where both systems coexist in daily life 1. Arndt emphasizes the lack of political momentum for a full metric conversion, stating,

There isn't really a movement to adopt the metric system in the US. It hasn't been a political issue for over 40 years.

--- Gary Arndt

This duality reflects a pragmatic approach where metric is used when necessary, but imperial persists due to tradition and convenience 1.

   

Public Awareness

Public awareness of the metric system in the US is surprisingly low, despite its legal status and historical ties. Gary Arndt explains that the US was one of the original signatories of the Metre Treaty and remains a member of the International Committee for Weights and Measures 2. However, efforts to transition to metric, such as the Metric Conversion Act of 1975, were voluntary and lacked incentives, leading to minimal change 2. Arndt compares the situation to a gym membership, noting,

The metric system in the US is a lot like going to the gym. We all know we should do it and eventually we'll get around to it, but we just never do.

--- Gary Arndt

The cost and perceived lack of necessity for change have kept the US largely imperial, with metric units used only when essential 2.