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Scaffold Base Plate Bearing Pressure Calculator

Check a scaffold leg's bearing pressure on its base plate or sole board against the ground's allowable bearing capacity.

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

Applied bearing pressure

261.6 kPa

Low confidence

This is a first-pass bearing-pressure screening only (leg load ÷ contact area, vs. a user-supplied allowable value). It does NOT verify overall scaffold stability, tie-in/guying requirements (OSHA 1926.451(c)(1), 4:1 height-to-base rule), component structural capacity (1926.451(a)(1), 4x max intended load), sole-board bending/shear adequacy, eccentric or dynamic loading, or site soil variability. Allowable bearing capacity must come from your own geotechnical data or a competent person's site assessment — OSHA does not publish a universal bearing value. Per 1926.451(a)(6) and (f)(7), scaffold design and erection must be under a qualified/competent person; this calculator is not a substitute for that.

Allowable bearing capacity (user-supplied)
150 kPa

At the values currently entered, the applied bearing pressure works out to 262 kPa. The largest intermediate quantity is allowable bearing capacity (user-supplied), at 150 kPa — check that step first if the total looks off. Note that base plate or sole board contact area sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. 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 — 261.6 kPa — 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

  • Applied bearing pressure = Leg Load × 9.81 ÷ Contact Area, the standard geotechnical bearing-pressure check (identical in principle to any shallow footing check) applied to a scaffold base plate or sole board. Per OSHA 29 CFR 1926.451(c)(2), scaffold footings must be 'level, sound, rigid, and capable of supporting the loaded scaffold without settling or displacement' — OSHA does not publish a universal allowable bearing value or leg load (per OSHA Standard Interpretation 2000-08-01, mudsill/footing sizing must be based on actual site soil conditions judged by a competent person).

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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

Where do I get the allowable bearing capacity for my site?
OSHA does not publish a universal allowable bearing value for scaffold footings — you need your own geotechnical data or a competent person's on-site assessment of the actual soil or surface conditions, per OSHA Standard Interpretation 2000-08-01.
What does this calculator NOT check?
This is a first-pass bearing-pressure screening only. It does not verify overall scaffold stability, tie-in/guying requirements (OSHA 1926.451(c)(1)), component structural capacity (1926.451(a)(1)), sole-board bending/shear adequacy, eccentric or dynamic loading, or site soil variability. Scaffold design and erection must be under a qualified/competent person per 1926.451(a)(6) and (f)(7).
How does a sole board change the result?
A sole board spreads the leg load over a much larger contact area than a bare base plate alone, which sharply reduces the applied bearing pressure — as shown by the two test cases here (261.6 kPa on a bare plate vs. 73.6 kPa with a sole board under a heavier load).