Coating Adhesion Test Calculator

Calculate pull-off adhesion strength (ASTM D4541) from force, dolly diameter, and specification minimum. Includes pass/fail and statistical analysis.

Pull-off force (N)

Dolly diameter (mm)

Spec minimum (MPa)

Number of pulls

Std deviation (MPa)

Tab to move between fields

Adhesion strength (MPa)

2.55

Passes spec (1=yes)

Adhesion strength (psi)369.3

Dolly area (mm²)314.16

Margin vs spec (%)-27.2

Coefficient of variation (%)15.7

95% lower bound (MPa)2.19

Force for spec (N)1,099.6

How to Use This Calculator

Enter coating type, substrate material, and surface preparation method used (abrasive blast grade, etc.).
Enter pull-off adhesion test results (MPa or psi) from a minimum of 5 test locations.
Read average adhesion strength and pass/fail assessment against the project specification.
Review failure mode distribution (cohesive, adhesive, or substrate) to diagnose adhesion issues.
Compare results against ASTM D4541 acceptance criteria for the coating system and exposure class.

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