Fatigue Analysis Calculator

About This Calculator

Free fatigue life calculator for steel members. S-N curve analysis per AISC 360 Appendix 3 with detail categories A through E. Estimate cycles to failure and remaining fatigue life.

Use the Fatigue Analysis Calculator to run free, browser-based calculations with full derivation output.

How to Use

1. Confirm the applicable units, materials, load cases, and project assumptions.
2. Enter the geometry, section properties, and actions required for the check.
3. Run the calculation and review the reported result, ratios, diagrams, or derivation steps.
4. Verify the output against the governing standard and your project documents before use.

What to Review

• Units, load combinations, and material properties used in the current run.
• Calculated capacities, utilisation ratios, reactions, or deflections shown on the page.
• Any assumptions, note text, or reference clauses surfaced with the result.
• Project-specific detailing, serviceability, or constructability requirements not captured by a generic tool.

Page last updated: 2026-06-01. All calculations and reference values must be verified by a qualified engineer before use in design.