// multi-utility computation suite · offline · instant · precise
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build.decking-joist-span Calculator
Calculates maximum allowable joist span from species (Southern Yellow Pine), grade, size, and spacing using span tables from the AWC Span Calculator. Exceeding the allowable span causes excessive deflection (L/360 is the standard limit) which cracks finishes and feels bouncy.
Inputs
Joist Size
Reference formula or conversion factor shown for context.
Wood Species
Reference formula or conversion factor shown for context.
Spacing In
Reference formula or conversion factor shown for context.
Load Psf
Applied force or weight (N or kN). Divide into dead load (permanent) and live load (variable — people, wind, etc.).
Results
max joist span (ft)
Sample size or count used in the calculation.
joist size
Reference formula or conversion factor shown for context.
species
Reference formula or conversion factor shown for context.
spacing
Sample size or count used in the calculation.
design load
Sample size or count used in the calculation.
note
Supplementary information explaining an assumption, caveat, or important context for interpreting the result.