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U.S. Metric Association |
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The U.S. Metric Association (USMA), Inc., is a national non-profit organization that was founded in 1916. It advocates U.S. conversion to the International System of Units, known by the abbreviation SI (ess-eye) and also called the modern metric system. The process of changing measurement units to the metric system is called metric transition or metrication.
Among other things, this site contains information about the metric system, with some specifically designed for educators, as well as information about USMA and links to some other sites.
We don't supply unit conversion utilities, but Google has a calculator that understands units.
What's New: Updated Information by Date: 2012-05-01: USMA's mailing address has changed. Here's our new mailing address. 2012-04-30: Added photos of two signs to the California section of the metric road signs pages. 2012-04-20: PDF of the 2012-May/June issue of Metric Today is now available online for USMA members. 2012-03-21: See the notice about World Metrology Day, 20 May 2012. 2012-03-09: Added the question, "What about atmospheric pressure: hectopascals, kilopascals?" to the FAQ. 2012-02-29: Added some new acronyms to the glossary of metric acronyms. 2012-02-23: PDF of the 2012-March/April issue of Metric Today is now available online for USMA members. 2012-02-15: Added a photo to the snacks section of the products in metric sizes pages. 2012-02-05: Added a yogurt section to the products in metric sizes pages. 2012-02-05: Added two reprints of Metric Today articles about metrication in the United Arab Emirates to the new relatively Recent international metric advances page. 2012-02-05: Added two signs to the New York section of the metric road signs pages. 2011-12-20: PDF of the 2012-January/February issue of Metric Today is now available online for USMA members. |
20 May 2012 See the following BIPM link for information:
See also USMA's list of Metric events and anniversaries. |
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Metric Today is a membership benefit of joining USMA |
This plastic ruler, manufactured for QSI Corporation, is available free to USMA members—or $1 for non-members—while the supply lasts.
All prices include shipping/handling to U.S. addresses. For non-U.S. orders, contact USMA Headquarters for the cost of shipping and handling.
Lend a hand to your local school. Help spread the metric message by gifting it with this colorful poster! Sized 53 cm × 71 cm and printed on thick glossy paper in full color, this poster displays the International System of Units. For U.S. destinations, the poster is $10, including shipping in a mailing tube (add $7 for each additional poster). [For non-U.S. orders, contact USMA Headquarters to obtain cost of shipping/handling.] Visit USMA's supplies page to order. A SI Metric Units Poster is available from USMA for the shipping/handling fee of $1.50 Titled SI Units, the poster contains the seven SI base units and most of the SI derived units with special names. Printed in two colors, black and red, the poster looks very similar to the adjacent illustration. Suitable for mounting on a wall, this 28 cm by 43 cm poster was developed to accompany a set of materials sent to schools in the Montgomery County (Washington DC) area. A large supply of these posters remain, and USMA will send them free for the cost of shipping and handling.
To order, send $1.50 each for shipping/handling with a request for the free SI Units chart to USMA Headquarters.
For multiple copies of the poster, contact USMA Headquarters for the cost of shipping and handling.
This 250 mL mug is dark blue with gold printing showing names and symbols of common SI units, and is available for $15 each (including shipping and handling) while supplies last. To order, send your name and address and $15 per mug to USMA Headquarters.
250 mm rulers
In addition to the ruler scale, the front side contains SI prefixes. The back side contains lists of SI units, conversions, and constants.
To get one, send your name and address (plus $1, if you're not a USMA member) to USMA Headquarters.
No e-mails or
phone calls, please.
Want more than one? Just add $1 for each additional ruler, or quantity discounts are as follows:
The Metric System Poster
Think Metric Mugs
Metric System Information for Teachers/Educators:
| Available for Purchase the 17th edition (2007) of USMA's Guide To The Use Of The Metric System A updated easy-to-use 34-page metric system style guide that shows the metric system units and symbols (short forms) and gives rules for using them. Appendixes contain information on technical units used in industry, conversion factors for the most commonly used units, and tips for remembering the everyday units and their sizes. This guide is also a very useful reference for teachers. Click here for a Table of Contents. 1 to 9 copies: $15 each, plus $4.00 shipping/handling for single copy
For multiple copies, contact USMA Headquarters for the cost of shipping and handling. Visa, MasterCard, and Discover accepted. Send orders to USMA Headquarters. |
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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 |
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Links to Other (Non-USMA) Metric System Information, Standards, Guides, and Policies

E-mail: USMA Webmaster
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Updated: 2012-05-13