Masonry Tools

Concrete Block Calculator

Calculate the exact number of CMU blocks, concrete masonry units needed for your wall project. Includes mortar, sand, and rebar estimates.

Wall Measurements

Calculation Results

Wall Area 0 sq ft
Blocks Needed 0 blocks
Net Wall Area 0 sq ft
Blocks per Course 0
Number of Courses 0
Mortar Bags (80lb) 0
Sand Needed (tons) 0
Block Cost (est.) $0

Block Size Guide

  • 8" Standard: Most common, load-bearing
  • 6" Thin: Veneer, non-load-bearing
  • 10-12" Thick: Foundation, retaining walls

Formula

Block Face Area = 16" × 8" = 128 sq in

Wall Area = Length × Height

Blocks = Wall Area ÷ 1.125 sq ft

Mortar = Blocks × 0.04 bags

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