From this site

One project, every trade

Each calculator adds its lines to a single estimate — consolidated BOM, schedule and cash-flow included.

Open My Project →

CMU Cell Grout Volume Calculator

Estimate the grout volume needed to fill a specific number of CMU cells over a given wall height.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
7.87 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Grout volume needed

32.81 cu ft

Check your inputs

Uses the manufacturer's cell area directly — actual grout consumption is somewhat less than the raw cell void due to mortar protrusions into the cell from the bed/head joints, typically accounted for with a small waste allowance when ordering.

Equivalent in m³
1.22 yd³

Running these inputs gives 32.8 cu ft as the grout volume needed. Note that number of grouted cells sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Grout volume = number of grouted cells x cell cross-sectional area x wall height, for vertically continuous grouted cores

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

How do I know how many cells to grout?
Follow your structural drawings — fully grouted walls fill every cell, while partially grouted (reinforced) walls typically grout only the cells containing vertical rebar, per your specific reinforcement layout.
Should I add extra grout for waste?
A modest allowance (5-10%) is reasonable for spillage and mortar protrusion into the cells — this calculator gives the theoretical void volume without that allowance built in.
Does grout come in the same bags as regular concrete mix?
No — masonry grout is a specific high-slump mix designed to flow into narrow cells without segregating, distinct from standard concrete or mortar mix; check with your supplier for pre-bagged or ready-mix grout options.