December 23, 2025, marks the 50th anniversary of the Metric Conversion Act, designed to bring US weights and measures in line with the rest of the world.

Metric units have conquered the globe, but in the US and the UK, their presence has become part of a culture war between ‘traditional’ and ‘progressive’ values. is a senior reporter who has covered AI ...

Have you ever noticed that the standard system of measurement tends to change when you exit the United States? Clothing sizes are often measured in centimeters instead of inches, distance is measured ...

If you know your U.S. history, there have been several attempts to adopt the metric system, all to no avail. It's the universal standard for most of the world and way more intuitive, yet the chances ...

Now that the United Kingdom is outside the European Union, it’s reviewing thousands of EU rules and regulations to see which it should jettison. Among them is the compulsory use of the metric system ...

Ever wondered what happened to our country’s conversion to the metric system? I did too. So, I did some digging and turned up some dead bodies in the process. Advertisement Article continues below ...

Following the loss of the Mars Climate Observer, the NASA Office of Inspector General initiated a review of the Agency’s use of the metric system. By law and policy, the metric system is the preferred ...

When it comes to measurement systems, the world largely follows a single standard: The metric system. Yet, the United States ...

Meet the metric system’s newest prefixes: ronna-, quetta-, ronto- and quecto-. Science News spoke with Richard Brown, head of metrology at the National Physical Laboratory in Teddington, England, ...

Here’s a good trivia question: What are the only 3 countries in the world that do not use the metric system? Everybody knows the good ol’ hard headed USA is in there, but the other two? How about ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American I’ve met a lot of people and learned a lot ...

I-19 in southern AZ is the only metric interstate in U.S. TUCSON, AZ — Former Scripps News Tucson traffic reporter Allen "Big Al" Kath points out a large sign on a recent drive along Interstate 19. He ...