Joist Hanger Calculator

Get the right Simpson hanger model, nail specification, and total nail count for your framing project — with a load-capacity check and nail-box quantity for purchasing.

joist hanger
HANGER MODEL
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Simpson Strong-Tie hanger

Usage Tip

Use ZMAX or stainless hangers with pressure-treated lumber — standard hangers corrode. Verify current load values at StrongTie.com.

THE MATH
Nails = Hangers × Nails per hanger
Hangers = Joists × (both ends doubles the count)
• Use ONLY manufacturer-specified nails — common nails void the load rating
• Fill every nail hole; partial nailing reduces capacity significantly
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.