Steel Joist Selection Calculator
Select a steel joist designation per SJI K-Series tables based on span, tributary width, and loading conditions.
Inputs
ft
ft
psf
psf
Results
Total Uniform Load
600 plf
Live Uniform Load300 plf
Joist Weight (est.)8.6 plf
Allowable Deflection (L/360)1 in
Required Moment of Inertia188.5 in⁴
Deflection Ratio360%
How to Use This Calculator
- Enter the clear joist span in ft and the tributary width (center-to-center joist spacing) in ft.
- Set the total design load in psf (dead + live + superimposed) and the unfactored live load in psf for deflection.
- Read Total Uniform Load (plf) — this is the value you match against SJI load tables to pick a joist designation.
- Check Allowable Deflection (L/360) in inches and Required Moment of Inertia to confirm serviceability.
- Use Joist Weight (est.) per linear foot to include self-weight in your structural dead load.
- Cross-reference the calculated values with your SJI K-Series or LH-Series load tables to finalize the designation.
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