How would you scale the Sims 4 sizes? For example, how many metres, feet,inches, centimetres (whatever unit you choose) would you say ONE grid square is? Keeping in mind a adult SIM 4 bed is roughly ...
When I'm building from plans, I generally divide feet in half; so if a living room is 12 feet wide by 10 feet deep, it's 6 feet by 5 feet in my Sim house. For really large plans that are mansions, I just cut the measurement down by a third. Any math more advanced than that plums with my head. :p