Carpentry Calculators
The carpentry calculators on myCarpentry.com are in the form of online tools that you can use to determine angles, rafter lengths, stair riser height, tread length, floor area, room volume, and much more. There is basic geometry and algebra behind most carpentry calculations. You can use a pocket calculator to work through all of these formulas, but the online calculators make the process much easier. Some of these formulas are available via the Math Calculators link.
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Joist and Rafter Length Tables
Use the tables below to determine allowable lengths of joists and rafters, based on size and standard design loads.
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Ceiling Joist Span Table
Use this table to determine the maximum lengths of ceiling joists based on
species of lumber, joist spacing, and joist size.
Floor Joist Span Table
Use this table to determine the maximum lengths of floor joists based on
species of lumber, joist spacing, and joist size.
Rafter Span Table
Use this table to determine the maximum lengths of roof rafters based on
species and grade of lumber, spacing, dimensions, load, and slope.
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