A brick calculator will tell you the number of bricks needed for a given size job. You first have to know which size brick you need. Bricks come in modular, queensize, oversize, closure and utility sizes. After you have chosen the brick size, you need measurements. Measure the job and figure total square feet, not including any openings like doors or windows. 250 square feet using modular size
. bricks will require 1,750 bricks. More about brick sizes and how to calculate at this website http://www.buildwithbrick.com/calculators/index.shtml.