Grout for a block wall: cells grouted every 8" to 48" and bond beams by the foot. Gives ft³, CY and 80 lb bags, from NCMA TEK 4-2A — the same math as the CMU page.
Grout calculator (CMU)
30 bags of grout0.72 CY · 19.52 ft³
- Wall area
- 320.00 SF
- Cells at 48"
- 19.52 ft³
- Total grout
- 19.52 ft³ · 0.72 CY
- 80 lb bags (preblended)
- 30 bags
These sketches are here to help you order material and price the work quickly. They are not engineered or shop drawings — always build from your approved project drawings.
Two-core block. Cells: TEK Table 3 solid-grout volume × 8 ÷ spacing. Bond beams: total length of all bond-beam courses and lintels.
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- Wall arealength × height40' 0" × 8' 0" = 320.00 SF
- Grout in the cellswall SF × TEK 4-2A Table 3 ft³ per 100 SF ÷ 100320 SF × 6.1 ÷ 100 = 19.52 ft³
- Total groutcells + bond beams(19.52 + 0) ft³ = 19.52 ft³
- Cubic yardsft³ ÷ 2719.52 ÷ 27 = 0.72
- Bags of grout (80 lb)ft³ ÷ 0.66, rounded up19.52 ÷ 0.66 = 30
Where the numbers come from
- Grout in the cells: TEK 4-2A Table 3, ft³ per 100 SF of wall — every cell: 6" 25.6 · 8" 36.1 · 10" 47.0 · 12" 58.9; at 48": 4.3 · 6.1 · 7.9 · 9.9NCMA TEK 4-2A Table 3 (two-core block, includes 3% waste): the page reads the row for your block width and cell spacing (8, 16, 24, 32, 40 or 48"), the same as the CMU page. Grouting 4" block is not recommended.Source
- Bond beams: One 80 lb bag fills about 2.7 LF of 6", 2.0 LF of 8", 1.6 LF of 12" bond beamTEK 4-2A Table 5. TEK has no figure for 10" bond beams, so they are left out with a warning.Source
- 80 lb bag of grout: About 0.66 ft³TEK 4-2A Table 4 note. Ready-mix grout is ordered by the CY.Source
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