Building & DIY

Concrete Block Fill Calculator (Grout Volume)

Enter your wall dimensions and block size and it works out how much grout you need to fill the cells of a CMU wall. You can fill every cell, every other cell, or only the code-minimum cells.

How to use
  1. Enter the wall area or length and height.
  2. Pick the block size, from 4 to 12 inch.
  3. Choose the fill spacing, then read the grout volume needed.
Estimates only, allow for waste and confirm against local building codes and supplier specs.
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Common questions

How much grout fills a concrete block wall?

It depends on block size and how many cells you fill. Filling every cell takes far more than the code-minimum pattern, so set the spacing that matches your plan.

Do I have to fill every cell?

Usually not. Many walls only need grout where there's vertical rebar, so check your local code for the required spacing.

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