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Lumber & Framing Calculator

Calculate studs, plates, headers, cripples, and trimmers for any wall with a printable cut list.

Enter wall length, height, and opening locations to get a complete framing material list. The calculator uses precut stud lengths for standard ceiling heights, sizes headers per IRC span tables, and counts king studs, trimmers, and cripples for every opening. Outputs a cut list so you know exactly what to order and what to cut on site.

Pro Tip: For 8-foot ceilings, buy precut studs at 92-5/8" rather than cutting 96" studs down. With a single bottom plate and double top plate, 92-5/8" studs give you a finished wall height of 97-1/8", which accommodates standard 8-foot drywall sheets with a 1/2" gap at the floor for moisture protection.

Framing done? Estimate insulation to fill the wall cavities.

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Ready to close up the walls? Calculate drywall sheets and finishing materials.

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Lumber & Framing Calculator
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How It Works

  1. Enter Wall Dimensions

    Input total wall length and ceiling height. The calculator determines the number of studs at 16" on-center (or 24" OC if selected) including the extra stud at each end.

  2. Add Openings

    For each door or window, enter the rough opening width and height. The calculator adds king studs, trimmers (jack studs), headers, and cripples automatically based on the opening dimensions.

  3. Select Header Size

    Choose a header size or let the calculator recommend one based on the span. IRC guidelines call for doubled 2x6 headers up to 4-foot spans, doubled 2x8 for up to 6 feet, doubled 2x10 for up to 8 feet, and doubled 2x12 for up to 10 feet in load-bearing walls.

  4. Configure Plates

    The default is a single bottom plate and a double top plate. For basement slab construction, a pressure-treated bottom plate is flagged separately in the material list.

  5. Review Cut List

    The output shows each lumber size with quantity and length: full studs, cripples (with exact cut lengths per opening), trimmer heights, and plate stock in the longest available lengths to minimize splices.

Built For

  • Builders framing new residential walls who need precise stud counts and header sizes for the lumber order.
  • DIYers framing a basement room who want to know exactly how many precut studs and plates to buy.
  • Contractors estimating material costs for wall framing including all the components around doors and windows.
  • Carpenters generating cut lists to reduce waste and speed up production on repetitive wall layouts.

Assumptions

  • Default stud spacing is 16" on center with precut 92-5/8" studs for 8-foot ceilings.
  • Header sizes based on IRC Table R602.7 for load-bearing exterior walls supporting roof and ceiling only.
  • Plate lumber ordered in maximum available stock lengths to minimize splices.

Limitations

  • Does not engineer custom beam headers for large spans or multi-story load paths. Consult a structural engineer for openings wider than 10 feet in load-bearing walls.
  • Does not account for corner framing details, partition intersections, or fire blocking, which add material beyond the basic wall count.

References

  • Header span tables from the International Residential Code (IRC) Section R602.7.
  • Precut stud lengths and plate configurations per standard platform framing practice, as described in the Carpentry and Building Construction textbook by Feirer and Hutchings.

Frequently Asked Questions

At 16" on center, you need approximately 1 stud per linear foot of wall, plus 1 extra for the end. The formula is (wall length in inches / 16) + 1 for the layout studs, then add king studs and trimmers for each opening. A quick estimate is 1.15 studs per foot to account for openings and corners.
A 3-foot (36-inch) rough opening in a load-bearing wall requires a minimum doubled 2x6 header per IRC Table R602.7(1). For non-load-bearing walls, a single flat 2x4 is sufficient. The header depth also determines the height of the cripple studs above it.
A king stud runs the full height of the wall from bottom plate to top plate, just like a standard stud. A trimmer (also called a jack stud) is shorter, running from the bottom plate up to the underside of the header. The trimmer carries the header load and transfers it to the bottom plate. Every opening needs at least one king and one trimmer on each side.
IRC Section R602.3.1 allows 24" OC framing with 2x6 studs on single-story homes or the top floor of multi-story homes, provided the wall sheathing and drywall are rated for 24" stud spacing. This saves about 30% on studs and gives deeper cavities for more insulation. It is common in energy-efficient construction.
Standard framing uses three plates total: one bottom (sole) plate and two top plates. Plate lumber is the same dimension as the studs (2x4 or 2x6). Order plates in the longest stock lengths available (typically 10, 12, 14, or 16 feet) to span as much wall as possible, and stagger the joints in the double top plate by at least 4 feet.
Technically, no. A non-load-bearing wall only needs a flat 2x4 across the top of the opening to support the short cripple studs above it. Many builders install a full header anyway to simplify the framing process and to avoid mistakes if the wall's load status changes during remodeling.
Cripple studs are short studs that fill the space above a header (between the header and the top plate) and below a window sill (between the sill and the bottom plate). They maintain the stud spacing layout so that sheathing and drywall edges always land on a framing member. They are non-structural but still required at 16" or 24" OC to match the wall layout.
Disclaimer: Verify all header sizes and framing details against local building codes and the International Residential Code (IRC). Load-bearing wall design should be reviewed by a licensed professional for spans exceeding standard tables.

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