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CMU Anchor Embedment Scaling Calculator

Scale a masonry anchor's rated pull-out capacity to a different embedment depth, from its manufacturer's reference test data.

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

Scaled capacity estimate

6.67 kN

Low confidence

Linear scaling is a rough approximation, not a substitute for actual manufacturer test data at your specific embedment depth — masonry anchor behavior is governed by the specific product's ICC-ES evaluation report, which should be consulted directly whenever the exact embedment you're using has its own tested/rated value.

At the values currently entered, the scaled capacity estimate works out to 6.67 kN. Confidence on this run is low: check the result against a supplier quote or a professional before ordering or building. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Add the equipment this sizes

This result is a specification — 6.667 kN — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

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

  • Masonry anchor capacity is governed by manufacturer ICC-ES evaluation report testing rather than a general calculable formula; a common simplified approximation scales the rated capacity linearly with embedment depth relative to the manufacturer's tested reference embedment

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Frequently asked questions

Why isn't there a simple universal formula for masonry anchor capacity, unlike concrete?
Unlike concrete (governed by the well-established ACI 318 breakout formula), masonry anchor capacity depends heavily on the specific block's material properties, face shell thickness, and whether cells are grouted — manufacturers establish rated capacities through actual physical testing (ICC-ES evaluation reports) rather than a general calculable formula.
Is linear scaling with embedment depth accurate?
It's a rough approximation useful for a first estimate — actual capacity-vs-embedment relationships in masonry are often non-linear, especially near the face shell thickness limit, so always check whether the manufacturer publishes rated capacity at your specific embedment depth directly instead of scaling.
What if my embedment is deeper than any tested value?
Never extrapolate beyond the manufacturer's tested range — contact the manufacturer for guidance or select a different anchor product rated for your actual embedment depth.