Cement Block Calculator

Enter wall length and height to get net wall area after subtracting doors and windows. Automatically converts area to block count using standard 8"×8"×16" CMU with 3/8" mortar joints — approximately 1.125 blocks per square foot.

Choose from standard CMU sizes: 8"×8"×16", 6"×8"×16", 4"×8"×16", and hollow or solid units. Each type automatically adjusts mortar volume, cement, and sand requirements for accurate ordering.

Calculate mortar volume, cement bags, and sand by mix ratio (1:3, 1:4, 1:5, or 1:6). Roughly 3 bags of cement and 0.6 cubic yards of sand are needed per 100 blocks with 3/8" joints.

Estimate horizontal joint reinforcement, bond beams, and lintels over openings. Includes vertical rebar at corners and openings, plus grout volume for filled cells in reinforced walls.

Get detailed cost projections for blocks, cement, sand, rebar, and labor. Adjust unit prices to match local market rates — typical block costs range from $1.50–$3.00 per CMU depending on region and block type.

Work in feet, inches, yards, meters, and centimeters. Block sizes can be entered in inches or millimeters. All calculations, material counts, and cost estimates update automatically. Fully functional offline with no internet required.