Measurements
Conversion Factor Table
http://www.uwosh.edu/students/wallip27/convert.html
The interface is a bit clumsy, but the information is thorough. Here's how it works:
You want to know how many centimeters are in 10 meters. You find meters in the table,
see that the conversion factor (or c.f.) is 100 (100 centimeters equal 1 meter),
and multiply that number by 10. Ten meters equal 1000 centimeters.
Engineering, Scientific Unit Converter
http://www.webcom.com/~legacysy/convert2/convert2.html
This forms-based tool will convert values in a number of categories: acceleration,
angle, area, current, force, inductance, mass, power, time, torque, velocity, volume,
and many others.
Measurements Converter
http://www.mplik.ru/~sg/transl/
Select from a list of measurement types that includes weight, volume, length, area,
speed, pressure, temperature, circular measure, and time; the script will convert
miles to kilometers, ounces to metric tons, and centuries to seconds.