| A Dictionary of Units | | A summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to change them into a standard unit. |
| Convert-me.Com | | Interactive calculators for many common and exotic measurement systems, including metric, Ancient Greek, Roman, and old Russian. |
| Funbrain.com | | Measurement game - Game which has several levels of difficulty for both English and metric rulers. |
| GCSE Maths: Measurement | | Includes length, area and volume and the use of prefixes in units. With worked examples and animations. |
| How Many? | | A dictionary of units of measurement: explanations of the metric system, System Internationale (SI), English customary system, and other modern measuring systems. Plus extensive links to other measurement-related Internet resources. |
| Jack's Math | | Provides several methods for determining length, width and height. |
| Metric 4 US | | A site promoting the metric system which argues why metric is better and English is worse. Provides an English-metric online calculator. |
| Metric Conversion | | Java metric conversion calculator for length, weight, pressure, and volume. |
| Metric Conversion Chart | | Online metric conversion calculator includes metric, US customary and Imperial unit conversions. |
| Metric Measures | | Offers equivalents for common measurements, plus how metric units are used in sports and the kitchen. |
| Online Units Conversion | | Gives equal values for areas, volumes, circle measurements, computer storage, currencies, distance and length, energy, fuel consumption, power, pressure, speed, temperature, time, torque, and weights. |
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