KW Liquid tank Heating calculator
- To determine kW required to raise the temperature of various liquids.
- http://www.thermalinc.com/math/roundtank.htm

Martindale's 'The Reference Desk: Calculators On-Line'
- A very extensive set of Java script based online calculators covering many subjects.
- http://www.martindalecenter.com/Calculators.html

Free Unit Converter
- Conversions of area, density, energy, force, length, mass, power, pressure, speed, temperature, volume and bytes.
- http://www.flowmeterdirectory.com/flowmeter_unit_converter/index.htm