>>11365453
Being 1/20 the height doesn't make you 1/20 the mass because you would also have to consider the reduction in volume. Someone at 1/20 the height would proportionally be 1/(20^3) the volume or 1/8000. Assuming density stays constant (similar to that of water) you would also see a proportional mass reduction to about 1/8000 the original mass.
Using the ballpark proportions of 1/8000 and 136,000 calories, that comes out to about 17 cal.
Using 69 inches and 3 inches, the ratio is more like 1/23, so cubing that gives 1/12,167 of the original mass. Assuming 136,000 calories again, it comes out to about 11.2 calories, which is within the other anon's range.
Of course, these calculations assume a lot of things about biology, physics, and chemistry, but following an average weight of 200 lbs for an adult male, in these calculations the 3 inch tall male would be a little under 10 grams or the weight of four pennies. That seems more reasonable than being 3 inches tall and weighing 10 pounds.
