一个3“人类男性体重多少？

In my world, which has an Earth-like gravity and environment, an adult, fit humanoid male is 3 inches tall. When I do a simple ratio calculation, I come up with him weighing 7.9 pounds. Basically, the weight of a gallon of water. This seems excessive. Any thoughts on how to calculate this would be greatly appreciated. Additionally, I may have to make them 4 inches tall to make the science work, so I'm looking for a way to adjust the height as needed. Thanks!In my world, which has an Earth-like gravity an