- Dictionary of Units, A
 - An explanation of the principle systems of units, their history, standards, and conversion factors for changing from one to the other. - English Weights and Measures
- Familiarise yourself with Imperial weights and measures, English weights and measures, and Customary weights and measures.
- How Many?
- Dictionary of units of measurement with commentaries and explanations of the English Customary, Metric, and International Systems.
- Lixcaliber
- Study of the Golden Section and Pi and their relationship to Earth Measure.
- Measure That
- Measurement resource guide covering weight, length, temperature, and other systems of units.
- Measurement Science Conference
- Promoting education and professionalism in measurement science and related disciplines, held annually in January.
- Measuroo
- Information on units of measurement, conversion, dimensional analysis, and related topics.
- MegaPenny Project, The
- Visualise huge collections of pennies (from one to billions and billions) accompanied by data on the size of the pile, weight, and area (if laid flat).
- Metrology Forum
- The science of measurement or calibration and associated topics. Enlightenment to the uninitiated and soul-food to practitioners of this art.
- Scales & Weights
- Photos of a collection of historical scales and weights, with trading opportunities.
- Science, Optics and You: Powers of 10
- Interactive Java tutorial that journeys in stages from 10 million light years beyond the Milky Way, to a treetop, to the nucleus at the heart of an atom, in order to visually describe orders of magnitude.
- Sizeasy
- Provides size and dimension comparisons to help decipher product measurements and put them into terms you can understand.
- Sizes
- Lists sizes, grades, units, scales, calendars, and chronologies.
- Sureunitz.com
- An overiew of measurements and units, including unit conversion, instrumentation, temperature, unit measurements, and the metric system.
- Uncertainty of Measurement Results
- Guidelines for the expression of uncertainty in measurement from the National Institute of Standards and Technology.
- Universcale
- Experience and compare the sizes of various objects -- from the nanoworld to the extremities of space -- on this Flash site hosted by Nikon.
- Weights and Measures and Standard Time
- Chapter 6 of United States Code Title 15 - Commerce and Trade.
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