How does the Joist Span Calculator work?

Identify joist size and wood species/grade Then: Determine design load and spacing Then: Reference span tables or use engineering formulas.

Can you give an example of how to use the Joist Span Calculator?

Example: Input 2x8 Spruce Pine Fir, 16" spacing, 40 psf load gives a result of Max Span: ~13 feet (Varies by local building codes).

Is the Joist Span Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Joist Span Calculator?

Our Joist Span Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Joist Span Calculator

Calculate maximum allowable span for floor or ceiling joists based on size and load

Difficulty:advanced

References

›Joist Span Calculator — Wikipedia

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