Approximately how many watts does a 50,000 gram human at rest (about 110 lbs) generate from metabolic heat?

The units of energy expenditure due to the metabolism of a person is measured in Metabolic Equivalent of Task, or MET. One MET is equivalent to 1.162 watts per kilogram of body weight.

The person under consideration weighs 50 kilograms, so the rate of energy expenditure is:

50 * 1.162 = 58.1

The person generates 58.1 watts.