MyYardCalcHow to use this block calculator
Use the exposed face dimensions of the block, not its thickness. Actual dimensions plus the joint form the repeating module.
Special corner, lintel and bond-beam units require a separate takeoff. Grout, mortar and reinforcement are not included.
Units = ceil(net wall face area × allowance factor ÷ (unit face + joint) module area).
A worked example
With the example values shown below, the calculated result is 75 pieces. These are demonstration inputs, not installation specifications.
View the example measurements
- Wall length: 20 ft
- Wall height: 3 ft
- Unit face length: 15.625 in
- Unit face height: 7.625 in
- Joint allowance: 0.375 in
- Extra allowance: 10 %
From estimate to order
Whole packages and pieces round up; measured lengths, areas and volumes keep full precision during calculation. Match the product dimensions and units to your quote, and check cuts, minimum orders and delivery before purchasing.