so i'm trying to create a material for a certain type of paneling we're putting on a project, and i cannot find out for the life of me what the density is (most important value that i need)

pacific panels makes something called the honeycomb sandwich material that we've gotten some samples of. i was instructed to create a material in solidworks for this exact type of panel. so i weighed and measured the sample.

size: 4x4x.51 inches

weight: 2.56 oz

and i need to get that to

lb/in^3

again, i can hardly multiply double digit numbers WITH a calculator, so help is incredibly appreciated.