calcs.homes
calcs.homes
Enter your wall's length and height to get standard concrete block (CMU) count, mortar bags, and estimated cost.
Estimate only — assumes standard 8 x 16 in (US) or 390 x 190 mm (EU) block with 3/8 in mortar joints.
The standard rule of thumb is 1.125 blocks per square foot of wall for an 8 x 16 in concrete block with a 3/8 in mortar joint (about 12.5 blocks per square meter for a 390 x 190 mm block). We multiply your wall area by that rate and add a small waste allowance. Mortar bags use another rule of thumb — about 3 bags per 100 blocks.
Multiply wall area (length × height) by 1.125 for standard 8 x 16 in block. Enter your dimensions above for the exact count with a waste allowance included.
About 3 bags of mortar mix per 100 blocks is a common rule of thumb, though joint thickness and block face shell design can shift this.