Hi there,

We're not exactly sure the square footage of this room, as it was a customer photo that was sent in. But it's approximately 100 square feet. If you measure the height and width of your wall in inches and divide that number by 144, you will get your total square footage.

We sell boxes in 20 and 40 square foot increments. There are 12 charges in a 20 square foot box and 24 charges in a 40 square foot box. Each charge is equal to 4' pieces.

We hope this helps! Let us know if you have any other questions.