Framing Tools

Beam Size & Joist Calculator

Calculate joist spacing, lumber size, and span requirements for floors, ceilings, and decks. Includes load capacity and material estimates.

Joist Configuration

Joist Analysis

Joists Needed 0 joists
Max Span OK? Check
Total Linear Feet 0 ft
Recommended Size -
Load Capacity -
Rim/Board Joists 0 ft
Blocking Needed 0 ft
Material Cost $0

Max Spans (16" OC)

  • 2×6: 9' - 10' (floor)
  • 2×8: 12' - 13'
  • 2×10: 15' - 16'
  • 2×12: 18' - 19'

Formula

Joists = (Area ÷ Span) × (12 ÷ Spacing)

Span Check = Compare to tables

Load = Live + Dead (40+10 psf)

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