Concrete Block Fill Calculator

Your details

Enter wall width and height, or enter the block count directly.
Horizontal length of the wall.
ft
Vertical height of the wall.
ft
Select the nominal width of your CMU block, or enter a custom core volume below.
Add extra material for spillage, over-pour and uneven filling. 10% is typical.
%
Enter the cost of ready-mix grout or concrete per cubic yard to get a material cost estimate. Leave at 0 to skip.
USD
Total fill volume (with wastage)
1.98yd³

Volume to order, including the wastage allowance

Number of blocks180blocks
Net fill volume1.8yd³
Total fill volume53.5ft³
80-lb bags needed90bags
Estimated material cost0USD
Net volume (yd³)1.8
With wastage (yd³)1.98

You need 1.98 yd³ of fill material including the 10% wastage allowance.

  • You need 1.98 cubic yards, which is 90 80-lb bags. Compare bag vs. ready-mix pricing for your area.
  • A nominal 8-inch block has approximately 0.270 ft³ of hollow core per block.
  • Tip: order your fill material at the same time as your CMU blocks to avoid a second delivery charge.

Next stepUse a concrete calculator to estimate any additional slab or footing pour, and a CMU block calculator if you still need the block count.

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