Results
Blocks required
—
Cells filled
—
Bags needed
—
at selected bag size
Volume (ft³)
—
With waste —
Volume (yd³)
—
With waste —
Volume (liters)
—
With waste —
Example Data
Click Load to populate the form with a scenario.
| Scenario | Wall (L × H) | Preset | Fill | Waste | Action |
|---|---|---|---|---|---|
| Garage stem wall | 24 ft × 4 ft | 8×8×16 | Every other | 7% | |
| Garden wall | 10 m × 1.6 m | 6×8×16 | Custom 0.4 | 8% | |
| Basement wall full grout | 36 ft × 8 ft | 12×8×16 | 100% | 10% |
Formulas Used
This tool estimates grout by modeling the internal voids of each block and the total count of blocks in the wall.
- Blocks per course:
ceil( wall_length_in / module_length_in ) - Courses:
ceil( wall_height_in / module_height_in ) - Total blocks:
blocks_per_course × courses - Filled cells per block:
cells_per_block × fill_fraction - Void area per cell (in²):
core_width_in × core_length_in - Grout volume per block (in³):
filled_cells_per_block × void_area_cell × actual_block_height_in - Total grout volume (ft³):
Σ volume_in³ ÷ 1728 - Waste factor applied:
volume × (1 + waste_%/100) - Bags needed:
volume_with_waste_ft³ ÷ bag_yield_ft³
Notes: Real-world cores vary by manufacturer. Knockouts and bond beams can change flow. Always confirm with product data and structural plans.
How to Use
- Enter wall length and height and choose the unit system.
- Select a block preset or choose custom then adjust module and actual dimensions.
- Set core opening size and fill pattern or a custom fraction if partially grouting.
- Pick a bag size yield and a waste percentage.
- Click Calculate to see volumes in ft³ yd³ and liters plus bag counts.
- Export your results via Download CSV or Download PDF.
FAQs
It is an engineering-style estimate based on idealized block geometry. Manufacturer core sizes webs bond beams and site details can change actual grout consumption. Add contingency and verify on site.
Override the core opening width and length to match your block submittal. The calculator updates volume from those dimensions directly.
Follow the structural drawings and code requirements. This tool lets you model fully grouted partial patterns or a custom fraction to match specified reinforcement spacing.
Typical yields: 80 lb ≈ 0.60 ft³, 60 lb ≈ 0.45 ft³, 50 lb ≈ 0.375 ft³. Always check the specific product datasheet for grout versus concrete and moisture content.
This estimate uses nominal module dimensions for course count and an actual block height for cell volume. If your modules differ adjust the inputs or choose custom.
Assumptions
- Nominal modules drive block count; actual height drives cell volume.
- Core is approximated as a rectangular prism; adjust to match submittal.
- Fractional fill distributes evenly along the wall.
- Waste covers spillage voids and overfill; adjust to conditions.
Quick Tips
- Increase waste for tall lifts hot weather or tight cells.
- Use custom fraction to reflect rebar spacing requirements.
- Export results to share with crew or include in takeoff.