Masonry Grout Calculator
Estimate masonry grout volume and optional cost for reinforced CMU walls, cells and bond beams.
Use this masonry grout calculator to estimate grout for reinforced concrete masonry unit walls. Choose Imperial or Metric units, enter the net wall dimensions, select a native CMU size and grouting schedule, then add waste and an optional delivered price per cubic yard or cubic meter.
Your Estimate
Estimated Grout Volume
20.70 cu ft
Cubic Feet
20.70 cu ft
Cubic Yards
0.77 cu yd
Cubic Meters
0.586 m³
Waste-Adjusted Volume (10%)
0.84 cu yd
Estimated from 180 blocks and the selected every other cell schedule. Actual CMU core dimensions and grout placement vary by manufacturer and wall design.
Results Actions
This is a material-planning estimate, not a grout-placement or reinforcement design. Follow approved plans for grouted-cell spacing, bond beams, lintels, cleanouts, lifts, consolidation and reinforcement.
Typical CMU Grout Fill Planning Factors
These are preliminary planning factors, not universal CMU capacities. Core geometry, webs, face shells, end configuration, bond-beam units and manufacturer dimensions vary. Use manufacturer fill tables or project-specific takeoff data for final ordering.
How to Use the Masonry Grout Calculator
- 1Choose Imperial or Metric units; switching systems loads sensible native defaults.
- 2Enter the net wall length and height in feet or meters.
- 3Select the specified CMU width and native block dimensions.
- 4Choose every cell, every other cell, every third cell or one bond-beam course.
- 5Select a 5%, 10% or 15% waste allowance.
- 6Optionally enter the grout price per cubic yard or cubic meter.
- 7Review base grout volume in cubic feet, cubic yards and cubic meters, then the native waste-adjusted order volume and optional cost.
CMU Core and Bond-Beam Grout Formulas
- 1Wall area = wall length × wall height.
- 2Estimated block count = wall area ÷ nominal block face area, rounded up. Imperial modules use 16 in × 8 in; Metric modules use 400 × 200 mm including joints.
- 3Every-cell grout volume = estimated block count × approximate full core-fill volume per selected block.
- 4Every-other-cell volume = every-cell volume × 0.50.
- 5Every-third-cell volume = every-cell volume × 1/3.
- 6Bond-beam blocks = wall length ÷ nominal block-module length, rounded up for one horizontal course.
- 7Bond-beam-only volume = bond-beam blocks × approximate channel-fill volume per block.
- 8Waste-adjusted volume = base grout volume × (1 + waste percentage).
- 9Cubic yards = cubic feet ÷ 27; cubic meters = cubic feet ÷ 35.3147.
- 10Estimated material cost = waste-adjusted cubic yards × price per cubic yard, or waste-adjusted cubic meters × price per cubic meter.
Example Calculation
Imperial example: a 20 ft × 8 ft wall contains about 180 nominal 8 in × 8 in × 16 in block modules. Grouting every other cell uses 180 × 0.23 cu ft × 0.50 = 20.70 cu ft, or about 0.77 cu yd, before waste. With 10% waste, the estimated order volume is 22.77 cu ft or 0.84 cu yd. Metric example: a 6 m × 2.4 m wall contains 180 nominal 390 × 190 × 190 mm blocks on 400 × 200 mm modules. Every-other-cell grouting uses about 180 × 0.0065 m³ × 0.50 = 0.585 m³ before waste and about 0.644 m³ with 10% waste.
Accuracy & Assumptions
- Results are preliminary material estimates and do not design reinforced masonry.
- Entered dimensions represent net CMU wall area; doors, windows and other openings should be removed before calculating.
- Block counts use nominal face modules including a typical mortar-joint allowance.
- Every-cell planning factors represent approximate total core capacity per block and vary with manufacturer geometry.
- Every-other and every-third schedules apply simple 50% and 33.3% factors to total core capacity; actual reinforced-cell layouts may not divide evenly.
- Bond-beam mode estimates one continuous horizontal course only and excludes additional bond beams, lintels, pilasters and vertical cells.
- Lintels and irregular bond-beam units should be calculated from their actual channel geometry and project details.
- Reinforcement displacement is not subtracted, while grout loss, cleanouts, pumping, spillage and overfill may increase usage.
- Waste is applied after the base grout volume is calculated.
- Optional cost includes grout material only and excludes delivery, pumping, short-load charges, reinforcement, mortar, CMU, labor and tax.
Frequently Asked Questions
How do I calculate grout for a CMU wall?
Estimate the block count from net wall area, multiply by the selected block’s approximate core-fill capacity, apply the specified grouted-cell schedule, then add waste.
What does every cell mean?
Every-cell grouting fills all aligned CMU cores in the wall area. It is a quantity option, not a design recommendation; follow the grouting schedule on approved plans.
How is every other cell estimated?
The calculator applies 50% of the selected block’s full core-fill volume. Actual wall layouts, end cells, corners, jambs and reinforced openings may require a project-specific count.
How is every third cell estimated?
The calculator applies one-third of full core capacity as a planning factor. Count the actual reinforced cells from the plans when accuracy is critical.
Does bond-beam mode include vertical reinforced cells?
No. It estimates one horizontal bond-beam course only. Calculate vertical cells or additional bond beams separately and combine the volumes.
Can I estimate grout for a lintel?
Bond-beam mode can provide a rough continuous-course reference, but lintels vary in length, depth, block configuration and reinforcement. Use the actual lintel geometry and approved detail for final quantities.
Why do CMU grout capacities vary?
Core shape, web thickness, face shells, end configuration and nominal size vary by manufacturer. Manufacturer grout-fill tables are more accurate than a generic planning factor.
How much waste should I add for masonry grout?
Five percent may suit a controlled takeoff, 10% is a practical planning buffer, and 15% may suit uncertain core geometry, pumping loss or complex walls. Confirm the final order with the grout supplier and mason.
Does rebar reduce the grout quantity?
Reinforcement displaces some volume, but this calculator does not subtract it. For planning, that small displacement can help offset minor loss, though project conditions still control final usage.
Does the cost include pumping or delivery?
No. Optional cost multiplies waste-adjusted volume by the entered grout price. Delivery, short-load fees, pumping, labor, reinforcement, CMU, mortar and tax are separate.
This calculator provides a preliminary masonry-grout quantity and material-cost estimate only. It does not determine which cells require grout, reinforcement, bond beams, lintels, cleanouts, lift heights or consolidation procedures. Actual volume varies with CMU manufacturer, core geometry, wall layout, openings, reinforced-cell schedule, bond-beam units, lintels, grout mix, placement method, pumping loss and waste. Follow approved structural drawings, project specifications, manufacturer data and applicable code, and confirm final quantities with the mason and grout supplier.