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Floor Joist Calculator — Free Online Tool
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Floor Joist Calculator

Calculate recommended joist size, spacing, and total quantity for floor framing

Framing Standard (IRC): Standard residential floor live load is typically 40 psf. Joist spacing is commonly set at 16 inches on center (o.c.) for standard subflooring.
Span & Load Parameters

Calculation Results

⚠️ Floor joist span recommendations assume #2 grade SPF or Southern Pine lumber. Always consult local building code span tables and a structural engineer for load-bearing configurations.

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