Framing & carpentry calculators
Stairs, studs, joists, rafters, decks, sheets and board feet — layout counts and cut lengths in feet-inches or millimetres. Every one works in feet and inches or in metric — flip the switch at the top and the numbers you have typed convert with it.
21 tools
- Stairs riser count, riser & tread size, stringer length
- Stair stringer layout every mark and cut on the board, printable
- Board feet board footage of rough or dimensional lumber
- Studs stud count & plate length for a wall
- Joist spacing joist count & spacing to fill an opening
- Deck boards decking rows, boards & linear feet
- Deck footing layout posts, beams and where every footing goes
- Rafter length common rafter cut length from run & pitch
- Hip & valley rafter hip length, hip plumb cut & jack difference
- Crown molding miter & bevel for any corner and spring angle
- Roofing squares & bundles from footprint and pitch
- Wall framing studs, plates, header length & sheathing for a wall
- Shed framing and sheet materials list for a gable shed
- 3-4-5 square diagonal to prove a square corner
- Right triangle solve sides & angle from any two
- Lumber weight weight of a board or stack for handling
- Plywood sheets sheet count for a surface area
- Baluster spacing even spindle layout under your max gap
- Miter angle cut angles for any number of sides or corner
- Linear feet linear ft ↔ board feet ↔ square feet
- Metal roofing panels, lengths & screws from coverage width
Nothing in this drawer matches. Try the full index, which searches every tool.
Which one do I need?
Layout counts and cut lengths, read the way a tape reads — feet, inches and sixteenths, or millimetres. Lumber sizes stay as their names (2x4, 2x10); spacing and counts only, never a span or a load.
- Laying out a set of stairs? Stair calculator →
- Marking the stringer itself? Stair stringer layout calculator →
- Where do the deck posts go? Deck footing layout calculator →
- A lumber list for a shed? Shed calculator →
- How many studs in a wall? Stud calculator →
- The whole wall — plates, headers, sheathing? Wall framing calculator →
- Rafter cut length from the pitch? Rafter length calculator →
- Squaring up a corner? 3-4-5 square calculator →
- Pricing lumber by the board foot? Board foot calculator →
- Spacing balusters under a railing? Baluster spacing calculator →
- The saw setting for a corner or a frame? Miter angle calculator →
The other drawers
- Concrete & masonry
- Site & landscape
- Finishes & interior
- Measure & layout
- Electrical
- Plumbing & HVAC
- Shop & equipment
- Conversions
- Every tool
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