Seems that quite often we must convert units of volume, flow, etc.
There is an excellent shareware program that does all type of conversions.
Convert 4.1 by Joshua F. Madison
Extremely easy to use, it deals with unit conversions of temperature, mass, volume, flow, area, distance, pressure, energy, light ... and so on up to 21 types. You can even built your own custom conversions
You can download it from
http://www.joshmadison.com/software/convert/