Free calculator

CMU Block & Mortar

Count concrete masonry units and mortar bags for a block wall, deducting openings.

Results

Enter your dimensions and hit Calculate.

Block walls over 4 ft typically require an engineer's design. This is a quantity takeoff only.

Assumptions

  • Standard 8×8×16 in CMU: 1.125 blocks per ft².
  • 5% waste/breakage added to block count.
  • Mortar: 3 bags (80 lb) per 100 blocks.

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The complete checklist for planning your property — from raw land to build-ready site. Clearing, access, drainage, septic, utilities, permits, foundation, and everything in between.

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