Who knows if this information will be of any use to anyone, but I thought it would be fun to figure out how much mass a kerbal has. I have determined that a kerbal has a mass of 0.032 mass units. If we take a mass unit to equal 1000kg (a tonne), then a kerbal weighs approximately 70.55 lbs on the surface of Kerbin or Earth. An important thing to note is that a kerbal has no mass while inside a command capsule.