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Wood Truss Camber Calculator

Estimate the recommended manufactured upward camber for a wood truss from its calculated dead-load deflection.

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

Recommended camber

0.59 in

Check your inputs

1.5× is a commonly-used manufacturer rule of thumb — confirm your truss supplier's actual camber schedule for the specific span and load.

At the values currently entered, the recommended camber works out to 15. Confidence is moderate: the method is sound, but real materials and site conditions vary. 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 — 0.591 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

  • Truss manufacturers commonly build in upward camber equal to approximately 1.5× the calculated dead-load deflection, to offset long-term sag and present a level/slightly-arched ceiling under dead load

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Frequently asked questions

Why build camber into a truss at all?
Wood trusses sag over time under sustained dead load (long-term creep); building in an initial upward camber offsets this expected sag so the truss appears level, or only very slightly arched, once dead load is fully applied.
Why 1.5x the dead-load deflection specifically?
This is a commonly-used manufacturer rule of thumb that accounts for both the calculated elastic dead-load deflection and additional long-term creep deflection in wood, not just the instantaneous deflection alone.
Should camber be based on live load too?
No — camber is sized to offset the sustained dead load (and its long-term creep), since live loads are transient and camber is a permanent, built-in geometry set at fabrication.