The US Metric Association (USMA), Inc., is a national non-profit organization that was founded in 1916. USMA advocates completing the US conversion to the International System of Units, known by the abbreviation SI (“ess-eye”) and also called the metric system. The process of changing measurement units to the metric system is called metric transition or metrication.

What’s new

Now available: USMA’s new 250 mm (25 cm) plastic ruler

Replaces our 200 mm (20 cm) ruler which sold out. Marked in millimetres on one side, and in centimetres on the other side. Includes the USMA logo and USMA web URL, as well as the New SI logo. Also, length equivalences on one side; and area, volume, and mass equivalences on the other side.

$1.00 each in small quantities, shipping/handling included

90 cents each for 10 or more, shipping/handling included

80 cents each for 100 or more, shipping/handling included

See USMA’s supplies list for this and other metric supplies and training aids.

Is your company or organization going metric?

We’d like to know.

Perhaps your hospital is changing over to measuring patients’ height and weight in metric units only, or your company’s product line is going hard metric. We’d be very interested in the how and the why. And, with your permission, we’ll tell your story in our newsletter, Metric Today . Please contact USMA.

Information about USMA

USMA and its services

Publications and supplies

Membership

USMA membership application (How to join us, how to help the cause)

Officers (USMA’s organizational leaders)

Metric system information

Why use the metric system?

Using the metric system

Background & history

For your information

Things you can do

Metric system information for teachers/educators

Need metric supplies?

USMA offers a selection of books, charts, posters, rulers, measuring tapes, bumper stickers, and thermometers specifically for learning the metric system.

These and more items can be found on USMA’s

metric supplies and training aids page.

Your comments, suggestions, and questions are welcome.

Contact USMA

Links to other selected (non-USMA) metric system information, standards, guides, and policies

Last updated: 2020-09-01