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Span, concrete, stairs, roofing and materials calculators built from the published IRC 2021 and AWC DCA 6-2015 tables. Every result prints with its assumptions.

Span Tables

Floor joist span
Beam span
Rafter span
Deck joist span
Deck beam span
Header size

Concrete

Concrete
Slab
Bags
Yards
Footing
Gravel

Stairs & Roofing

Stair stringer
Deck stair
Roof pitch
Roof area
Shingle
Rafter length

Materials

Square footage
Board foot
Tile
Drywall
Fence
Deck board

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Calculations reference IRC 2021 and AWC DCA 6-2015. Verify with your local code. Not a substitute for a licensed engineer or your local building department.