Residential Wood Floor Joist Maximum Span & Load Calculator (20" O.C. Spacing)
Precision calculator for wood framing spaced at 20 inches on center. Calculate real-time metrics with formulas, automatic units handling, and instant results.
Formula & Calculation Logic
Max Deflection L/360, Bending Moment M = wL² / 8
Inputs used by this tool
Enter values in the interactive controls when the page loads. The result depends on the assumptions and units shown for each field.
Input type: number
Input type: number
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