CMU Fill Takeoff Sheet
A one-page takeoff sheet for estimating hollow block fill and bag count before you go to the supplier.
BFCBrilliance · bfcbrilliance.com/tools/concrete-block-fill-calculator
Project details
- Date
- Project
- Wall length
- Wall height
- Block size
- Bag yield
Measure each wall
| Wall section | Length (ft) | Height (ft) | Block size (in) | Cells/block | Fill volume (ft³) |
|---|---|---|---|---|---|
Tool constants and sources
- Nominal CMU face size
- 16 in × 8 in — ASTM C90 / ASTM C140 masonry unit dimensions
- Open-cell fill factor
- 0.132 — derived from General Shale’s published 8 inch Stretchers row: 29.7 / 225 = 0.132
- Litres per cubic foot
- 28.3168 L per ft³ — NIST exact conversion
- Bag yield
- Use the manufacturer’s published yield for the chosen mix
Before you buy
- Confirm whether all cells are to be filled or only reinforced cells.
- Check the exact bag yield on the product label or data sheet.
- Allow extra bags if the wall has bond beams, pilasters, or spillage risk.
Common mistake
People often count the wall’s face area only and forget that hollow block fill depends on the block core volume and the number of cells.