How do you figure square feet of a room

Next, multiply the length by the width to calculate a room's total square footage. So if a bedroom is 12 feet wide and 12 feet long, it is 144 square feet total (12 x 12 = 144 sqft).

Bedroom 1: 10 feet x 12 feet = 120 square feet.

Square footage: 288 sq. ft.

Multiply the width and length of each rectangle together to find the area. Then, add the areas of each rectangle together to find the total area. If you have an L shaped room, for example, this can be split into 2 rectangles.