A standard concrete block covers about 0.89 square feet of wall face (an 8×16 inch block including mortar). Divide your wall area by that, add a waste allowance for cuts and breakages, and you have your block count.
For the build
Lay them right.
Masonry trowel set
Spread mortar cleanly.
Mortar mix
Ready for the job.
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Frequently asked questions
How many blocks per square foot?
About 1.125 standard 8×16 blocks per square foot of wall.
How much waste should I add?
5–10% is typical to cover cuts, breakages and mortar joints.