Space on a Ship Duplicate

How much space/weight does a person take up on a ship. Is it just 200 stone as in the passenger's section of the merchant rules or is that just living space for a person comfortably? We just got a ship and all of out henchmen and the players would max out the ship's weight along if its 200 stone so that seemed silly. The DM ruled 70 stone per person but was wondering if there is a math to it.

Demons Eye - This is a duplicate of your other thread; I've renamed it temporarily to fix the issues some folks were having with seeing the 'real' thread as eternally new. I think you managed to simul-post yourself. I'll take care of it after I can do some digging to see if that's a thing or not.