Stringers and rafters
Structural Framing & Wood
IRC stair layout to the sixteenth of an inch, plus common-rafter length, pitch, sheathing, and shingle quantities.
Master calculators
Stair Stringer Layout Calculator
Turn a floor-to-floor rise into an equal riser, a total run, a diagonal stringer, and the framing-square settings.
Roof Pitch and Common Rafter Calculator
Measure a gable or shed roof from span, length, pitch, and eave overhang. The truss triangle scales as you move the pitch.
Preset pages
Deck Stair Stringer Calculator, 36 to 96 Inch Rise
A 72 in deck rise as the working case, compared with 36 through 96 in.
Basement Stair Stringer for a 9 Foot Floor-to-Floor Rise
A 9 ft 0 in floor-to-floor basement stair. Add joist depth if your ceiling is 9 ft and the floors are farther apart.
6/12 Roof Pitch, Rafter Length, and Shingle Bundles
A 6/12 gable, 24 ft wide and 40 ft long, with a 12 in overhang.
4/12 vs 8/12 Gable Roof Material Estimator
The same 28 by 40 ft gable priced at 4/12, with 8/12 in the comparison table.
Interior Stair, 108 Inch Rise, 10 Inch Tread
An interior stair at the IRC minimum tread and a 108 in rise.
Deck Stairs, 48 Inch Rise, Three-Stringer Layout
A low deck, 48 in to grade, hung with a dropped header.
12/12 Pitch Gable Rafter on a 24 Foot Span
A 12/12 gable. The plumb cut and the seat cut are both 45 degrees.
Shed Roof 3/12 Pitch on a 10 by 12 Foot Building
A small shed roof. The full 10 ft width is the run, not half of it.
9/12 Pitch Roof on a 30 Foot Span
A steeper 9/12 house roof with a longer eave overhang.
Porch Stairs, 24 Inch Rise, IRC Riser Check
A short porch flight. Three risers at 8 in would fail, so the equal-riser math matters.