Price lumber by the board foot, lay out stairs against the IRC riser and tread limits, convert roof pitch to degrees and size common rafters.
Carpentry and roofing calculators
| Job | Calculator |
|---|---|
| Pricing hardwood or rough lumber | Board foot calculator |
| Framing a wall | Stud calculator |
| Building stairs | Stair calculator |
| Finding a roof’s slope | Roof pitch calculator |
| Cutting rafters | Rafter length calculator |
| Soffit and eaves | Soffit calculator |
Measure once, cut once
- Board feet use nominal thickness for rough lumber and actual size for surfaced boards; ask your yard which they quote.
- Stud spacing is usually 16 in on center, with extra studs at corners, openings and wall ends.
- Roof pitch is rise over 12 in of run; a 6/12 roof rises 6 in for every foot. See how to calculate roof pitch.
- Stair rise and run must meet your local building code; our stair stringer guide explains the common limits.
These tools give estimates for planning and ordering. Structural spans, rafter sizes and stair dimensions must follow your local code and, where required, an engineer’s design.