CMU Block Count
Stretcher face area with 5% waste; rough mortar bags.
Inputs
Results
Blocks
269
Mortar bags (~)29
How to Use This Calculator
- Enter the wall length in feet and wall height in feet.
- Set the block face area in sq ft — standard 8×16 stretcher blocks cover approximately 1.125 sq ft each.
- Read the block count including 5% waste and the approximate number of mortar bags needed.
How the result changes with Length (ft)
| Length (ft) | Blocks |
|---|---|
| 1,000 | 8,400 |
| 3,500 | 29,400 |
| 6,500 | 54,600 |
| 9,000 | 75,600 |
What each input means
- Length (ft)
- Total length of the wall in feet. Measure all sections if the wall has multiple runs.
- Height (ft)
- Height of the wall in feet. Standard CMU courses are 8 inches, so a 9 ft wall is about 13.5 courses.
- Block face (ft²)
- 8×16 stretcher ≈ 1.125.
How this is calculated
Worked example, using the default values
- Identify Input ParametersLength (ft) = 32, Height (ft) = 9, Block face (ft²) = 1.125 = 3 input(s) provided
- Calculate BlocksBlocks269 = 269
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.
Related Calculators
The questions that sit next to this one — chosen by subject, including calculators filed under a different category.
Structural Engineering
Anchor Embedment
Illustrative tension embedment — verify with ICC-ES data.
Construction EstimatingDebris Dumpster
C&D volume from area and debris intensity; suggests roll-off size.
MasonryCMU Wall Design Calculator
Calculate concrete masonry unit (CMU) block count, rebar, grout, and mortar for a block wall.
Structural EngineeringMasonry Wall Design Calculator
Design reinforced masonry walls: check slenderness, compressive capacity, moment capacity, and load adequacy.
FacadeBrick Veneer Calculator
Brick count, ties, and flashing for veneer walls.
More in Construction & Building Trades.