How many playpen balls would it take to fill your apartment?

Provide metrics like floor area, depth of balls, radius of each ball, and cost per ball, it’ll tell you exactly how many balls and how much money it would cost to fill your apartment with playpen balls.

Pretty handy, for a website.

I recommend excluding bathrooms for sanitary reasons.

If you don’t have screen windows, you probably want to stay under sill level … or get screen windows.