Webum > Science > Technology > Chemical Engineering > Software > Units Conversion Programs See also Science > Reference > Units of Measurement Free Unit Converter Conversions of area, density, energy, force, length, mass, power, pressure, speed, temperature, volume and bytes. Martindale's 'The Reference Desk: Calculators On-Line' A very extensive set of Java script based online calculators covering many subjects. Pumpuniversity: calculators, conversion programs and theory On line calculators, conversion programs and theoretical information on pumps. Help build the biggest human edited directory on the internet Add your website - Open Directory Project - Become an editor