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Carpentry & Framing
Carpentry and framing calculators for stairs, rafter spans, board feet, joist spans, and beam sizing
Instant Answers
Pre-calculated results for common scenarios
floor joist span
2×8 Douglas Fir Floor Joists at 16" O.C.2×10 Douglas Fir Floor Joists at 16" O.C.2×12 Douglas Fir Floor Joists at 16" O.C.2×10 Douglas Fir Floor Joists at 12" O.C.2×10 Douglas Fir Floor Joists at 24" O.C.2×8 Southern Pine Floor Joists at 16" O.C.2×10 Southern Pine Floor Joists at 16" O.C.2×12 Southern Pine Floor Joists at 16" O.C.2×8 SPF Floor Joists at 16" O.C.2×10 SPF Floor Joists at 16" O.C.2×12 SPF Floor Joists at 16" O.C.2×10 Hem-Fir Floor Joists at 16" O.C.2×8 Douglas Fir Floor Joists at 16" O.C. (30 PSF)2×10 Douglas Fir Floor Joists at 16" O.C. (30 PSF)2×12 Douglas Fir Floor Joists at 16" O.C. (30 PSF)2×6 Douglas Fir Floor Joists at 12" O.C.2×6 Douglas Fir Floor Joists at 16" O.C.2×6 Douglas Fir Floor Joists at 24" O.C.2×12 Douglas Fir Floor Joists at 24" O.C.
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Stair Calculator
Calculate stair dimensions including rise, run, and stringer length per building codes
IRC 2021 Section R311.7IBC 2021 Section 1011
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Rafter Span Calculator
Determine allowable rafter spans based on species, grade, spacing, and load conditions
IRC 2021 Table R802.4.1AWC Span Tables for Joists and Rafters
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Board Foot Calculator
Calculate board feet for lumber pricing and material takeoff
NHLA Lumber Grading RulesBoard Foot Calculation Standards
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Floor Joist Span Calculator
Determine allowable floor joist spans based on lumber specifications and loads
IRC 2021 Table R502.3.1AWC National Design Specification
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Header Beam Sizing Calculator
Calculate required header and beam sizes for openings based on span and loads
IRC 2021 Table R502.5AWC Beam Design Formulas