Concrete Block Calculator

Your details

ft
ft
Nominal face dimensions include the mortar joint. Standard CMU is 16 x 8 in.
Total area of doors and windows to remove from the wall before estimating.
sq ft
Extra for cuts, breakage and corners. 5-10% is typical.
%
Share of block cells filled with grout for reinforcement. 0% for an unfilled wall.
%
Ladder or truss horizontal joint reinforcement laid every N courses.
Currency
Blocks needed
189
Blocks (no waste)180
Net wall area160 sq ft
Mortar bags (~80 lb)6
Sand1.89 tons
Core grout fillNone (0% filled)
Joint reinforcementNone

Order about 189 blocks for this wall.

  • Block count is the net wall area divided by one block face area, then rounded up to whole blocks.
  • The waste allowance adds about 9 spare blocks for cuts, breakage and corners.
  • Plan for about 6 bags of mortar and 1.89 tons of masonry sand to lay them.

Next stepConfirm footing, rebar and any solid-grouted cells against your local building code before ordering.

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