Construction

Concrete Block Fill Calculator

Find concrete to fill block cores.

Calculated Output

Concrete volume 26

Volume 0.963

80 lb bags 44

Formula: volume = blocks × fill per block

Step-by-Step Breakdown

1. Values used:

2. Number of blocks = 100

3. Fill per block = 0.26

5. Concrete volume = Number of blocks x Fill per block = 100 x 0.26 = 26

6. Volume = 0.963

7. 80 lb bags = 44

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The math behind it

volume = blocks × fill volume per block. A standard 8 in block's cores hold ~0.26 ft³.

100 blocks × 0.26 → 26 ft³ (~0.96 yd³).

Every core?

Often only reinforced/rebar cells are filled — count those blocks.