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Masonry Lintel Bearing Length Checker

Check whether a lintel's end bearing length meets standard code minimums.

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

Provided bearing length

6 in

High confidence

PASSES the applicable minimum bearing length.

Required minimum
4 in

At the values currently entered, the provided bearing length works out to 6. The largest intermediate quantity is required minimum, at 4 in — check that step first if the total looks off. 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 in — 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

  • Standard building code minimum lintel bearing length is 4 in on each end; steel or reinforced masonry lintels require at least 5 in bearing; the Portland Cement Association recommends a minimum of 6 in for concrete lintels

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Frequently asked questions

Why does bearing length matter?
Adequate bearing length ensures the load from the lintel (and the masonry above it) transfers safely into solid masonry beyond the opening, without exceeding the masonry's allowable bearing stress or risking a local crushing failure.
Does bearing stress ever require more than the code minimum?
Yes — for heavily loaded lintels (long spans, high loads above), the bearing stress calculation may require more bearing length than the minimum to keep stress within allowable limits, even if the minimum is code-compliant on paper.
Does bearing length differ for wood or steel beams bearing on masonry?
Similar minimums generally apply, but always check your specific local code and the beam manufacturer's requirements — this calculator uses common masonry-specific lintel bearing minimums.