Concrete Block Fill Calculator
Calculate grout or concrete fill volume for hollow CMU blocks. Supports 4" through 12" block sizes with partial fill options.
𧱠Concrete Block Fill Calculator
Results
Fill Volume2.80 cu ft
Cubic Yards0.10 cu yd
With 10% Waste0.11 cu yd
80 lb Bags5 bags
π‘ How to Calculate Block Fill
Hollow CMU (concrete masonry unit) blocks have two cores that can be filled with grout or concrete. Solid grouting fills every core β required for reinforced walls and below-grade applications. Partial grouting fills only cores containing rebar, saving material on non-structural walls.
Fill volume per block depends on block width: an 8-inch standard block takes about 0.028 cu ft of grout per core fill. For 100 blocks solid-grouted, you need roughly 2.8 cu ft (0.10 cu yd). Always add 10% waste for spillage and overfill.
100 standard 8" blocks, solid grouted: 2.8 cu ft = 0.10 cu yd. With 10% waste: 0.11 cu yd. Or about 5 bags of 80 lb premix grout.