Anchor Bolt Proof Load Calculator

Calculate the maximum proof load for anchor bolt pull testing per ACI 318 Chapter 17 and ICC-ES AC308. Proof load is the lesser of 67% of nominal concrete breakout strength or 80% of steel yield strength.

Input Parameters

inches

Results

Proof Load
—
lbs
Select inputs and click Calculate

Code References

Proof load shall not exceed the lesser of 67% of the controlling nominal strength or 80% of calculated steel yield strength per ICC-ES AC308 and Hilti technical guidance.

Concrete breakout strength (Nb) calculated per ACI 318 Chapter 17, Eq. 17.6.2.2.1 for a single anchor in uncracked concrete with no edge or spacing reductions.

Steel tensile stress areas (Ase) per ASME B1.1 for UNC threads.

This calculator provides a simplified single-anchor estimate. Actual proof loads must account for edge distances, anchor spacing, eccentricity, and cracking conditions per the project-specific engineering analysis.

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