Mortar Joint Volume Calculator
Estimate mortar joint volume, masonry unit count, bag quantity and material cost from wall dimensions and editable joint geometry.
Default project preview
7 bags
Mortar joint volume
4.58 ft³
Estimated units
247
Bed-joint length
288 ft
Head-joint length
148.7 ft
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Input and output guide
What each value means
The labels and units below are part of this calculator’s visible methodology. Replace every default with measurements or product data from the actual project.
Wall length
Enter this project assumption in ft. The current imperial default is 24 ft.
Wall height
Enter this project assumption in ft. The current imperial default is 8 ft.
Masonry unit length
Enter this project assumption in in. The current imperial default is 15.625 in.
Masonry unit height
Enter this project assumption in in. The current imperial default is 7.625 in.
Joint width
Enter this project assumption in in. The current imperial default is 0.375 in.
Joint depth
Enter this project assumption in in. The current imperial default is 3.5 in.
Waste allowance
Enter this project assumption in %. The current imperial default is 15 %. Minimum: 0. Maximum: 50.
Mortar yield per bag
Enter this project assumption in ft³. The current imperial default is 0.7 ft³.
Price per bag
Enter this project assumption in per bag. The current imperial default is 13 per bag. Minimum: 0.
How to read the outputs
Mortar joint volume
including waste. Default preview: 4.58 ft³.
Estimated units
19 per course × 13 courses. Default preview: 247.
Bed-joint length
horizontal joints. Default preview: 288 ft.
Head-joint length
vertical joints. Default preview: 148.7 ft.
Material allowance
rounded bags × entered price. Default preview: $91.00.
Waste allowance
mixing loss, droppings and tooling. Default preview: 15%.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Courses and units per course come from wall dimensions plus joint width. Bed-joint and head-joint lengths are multiplied by joint width and depth. Waste is added, then mortar bags are rounded up from the entered yield.
FAQ
Mortar Joint Volume Calculator questions
Does this include mortar inside block cores?+
No. It estimates bed and head joints only. Grout or core fill should be calculated separately.
Why can actual mortar use differ?+
Unit shape, bond pattern, openings, joint tooling, droppings and mason technique all affect consumption.
Can this be used for brick?+
Yes, when the entered brick dimensions, joint width, joint depth and mortar yield match the project.