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The United Kingdom Metric Association

DTI website — about weights and measures and use of metric

UK Metrication

The National Weights and Measures Laboratory

Metrication Matters — What is metrication and why does it matter?

International Standard Paper Sizes or

Modern metric system — Modern weights and measures, a complete reference

Metrication — lots of helpful info and converters (be warned that the site plays music when loaded, do not access if the music will cause a problem, e.g. at work)

Metric to Metric conversions (short quiz)

Interactive animation showing how big very small things are

United States Metric Association

US National Institute for Standards and Technology — about units and constants

Think Metric sign at US-Canada border

Metric System Measurements for Non-Metric Users

Metric Road Signs Seen in the USA

Learn the Metric System on Line with Mr. Light Bulb — for younger Internet users

International Bureau of Weights and Measures (BIPM)

One Metre — Canadian metric site

Canadian Metric Association — not an official site, but gives contact details

Metric prefixes

Other Think Metric sites

Dictionary of units

Dictionary of Units of Measurement


Links to external sites are subject to change or not being available. The authors of this site have no control over the content of external sites, and offer no warranty as to the accuracy of information found on those sites. Links may open in a new window.

If you find a link that is not working, or you want to suggest a link, please use the Contact page. We are happy to consider all relevant sites which educate or promote metric.


This page was last udpated on 29 April, 2006


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Ruler in centimetres, because metric is very useful