Stud & Wall Framing Calculator

Count studs, size headers, and estimate all framing lumber per IRC R602 — for 16" and 24" OC walls with any combination of openings.

Wall Parameters

Wall Type

Wall Length (ft)

Wall Height

Stud Spacing

Number of Stories Above

Connections & Openings

Corners

T-Walls

Openings

Lumber Cost ($/linear ft, optional)

$ /lf

Cost per stud (optional)

$ /stud

Total Studs Needed

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including 10% waste

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Field Studs

—

Extra Studs

—

Plate LF

—

Sheathing Sheets

Wall Framing Diagram

Wall Framing Layout

Stud positions and opening details for the configured wall.

Stud Breakdown

Header Schedule

Full Materials List

Lumber quantities with standard stick lengths for ordering.

Framing Components Chart

IRC R602 — Wall Framing

Key code sections governing residential wood frame wall construction.

R602.3 — Stud Size & Spacing

Bearing walls: 2×4 studs at 16" OC max (or 2×6 at 24" OC)
Non-bearing walls: 2×4 at 24" OC max
Maximum stud height: 10 ft for 2×4; 14 ft for 2×6
Exception: 10 ft walls may use 2×4 at 24" OC with doubled top plate

R602.7 — Headers

Required over all openings in bearing walls
Size per Table R602.7 based on span and load
Single 2×4 header with cripples permitted in non-bearing walls ≤ 8 ft span
LVL, PSL, LSL headers may substitute for solid wood

R602.10 — Wall Bracing

Exterior walls require lateral bracing at corners and intervals
Methods: let-in bracing, diagonal sheathing, structural panels, or portal frames
WSP (wood structural panel) sheathing counts toward bracing
Bracing line spacing: max 25 ft along each wall

R602.3.2 — Top Plates

Bearing walls: doubled 2× top plate required
Lap at corners and intersections: min 24" lap
Single top plate permitted with rafter directly above stud
Non-bearing walls: single top plate acceptable

Header Span Table (IRC Table R602.7)

Maximum header spans for exterior bearing walls. Double 2× lumber with 1/2" spacer (3" net width).

How to Use This Calculator

Select wall type — Exterior bearing, interior bearing, or non-bearing wall determines header requirements and stud rules.

Enter wall length and height — Use the preset heights (8, 9, 10 ft) or enter a custom dimension for tall walls.

Choose stud spacing — 16" OC is standard for bearing walls; 24" OC reduces lumber cost for non-bearing partitions.

Add corners and T-walls — Each corner adds 2 extra studs for the 3-stud corner post assembly; each T-wall intersection adds 2 backup studs.

Add door and window openings — Enter rough opening width and height. The calculator adds king studs, jack studs, headers, and cripple studs automatically.

Review the Materials List tab — See full lumber quantities broken down by component for ordering.

Framing Terminology

King StudFull-height stud on each side of an opening; supports the header ends.

Jack Stud (Trimmer)Shorter stud nailed inside the king stud; bears the header load directly.

HeaderDoubled horizontal lumber spanning an opening; carries load from above.

Cripple StudShort stud above a header or below a windowsill; maintains panel nailing spacing.

Rough Opening (RO)Framed opening size; door RO = door size + 2" width + 2.5" height; window per mfg.

Double Top PlateTwo layers of horizontal lumber at the top of a bearing wall; ties the frame together.

Sole Plate (Bottom Plate)Single horizontal member at the base of a wall; studs nail to it.

Corner Post3-stud assembly at wall corners providing backing for interior drywall attachment.

Frequently Asked Questions

What is the difference between 16" and 24" OC framing?

16" OC (on-center) means studs are placed 16 inches apart, center to center. This is standard for most bearing walls. 24" OC uses fewer studs (saves ~25% lumber cost) and is acceptable for non-bearing partitions or exterior walls in single-story buildings under certain code conditions. Verify spacing with your local building department for bearing walls.

Why do I add extra studs at corners?

A simple two-stud corner doesn't provide backing for drywall in the interior corner. The standard 3-stud California corner or T-post adds one or two extra studs to create a nailing surface for interior drywall attachment. This calculator adds 2 extra studs per corner.

How are header sizes determined?

Header size depends on the opening span, wall type (bearing vs. non-bearing), and the load above (1 vs. 2 stories). IRC Table R602.7 lists minimum header sizes. For exterior bearing walls, a 3-foot opening typically needs a doubled 2×6; a 6-foot opening needs a doubled 2×10. Non-bearing walls can use much lighter headers or even a flat 2×4.

What rough opening size should I use for doors and windows?

For pre-hung doors: RO width = door width + 2" (for jack studs + shims); RO height = door height + 2.5". For windows: use the manufacturer's specified rough opening, which is typically window unit size + 0.5" to 1" on each side. Enter the rough opening dimension in this calculator.

Does this include the bottom plate material?

Yes. The Materials List tab includes 1 bottom plate + 2 top plates (double top plate for bearing walls) = 3 × wall length in linear feet of plate stock. Lumber is shown in 8-foot and 16-foot standard lengths. Pressure-treated lumber is required for bottom plates bearing directly on concrete.