UK Metric Association
Dr Metric – educational problems caused by the continued use of medieval units in Great Britain.
Gov.uk website – about weights and measures and use of metric
UK Metrication – archived information
Weights and Measures Law – weights and measures law
Metrication Matters – What is metrication and why does it matter?
International Standard Paper Sizes
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
Scale of the Universe – Interactive animation showing how metric can measure any scale in the universe
Powers of Ten – A film made in 1977, dealing with the relative size of things in the Universe, and the effect of adding another zero
United States Metric Association
US National Institute for Standards and Technology – about units and constants
More Than A Mile Behind – America and the metric system
Think Metric sign at US-Canada border
Metric Road Signs Seen in the USA
International Bureau of Weights and Measures (BIPM)
One Metre – archived Canadian metric site
Canadian Metric Association
SI units – NPL is the UK’s National Measurement Institute
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