Shiplap Calculator: Boards for Any Wall
Use this shiplap calculator to determine exact board counts and linear footage for modern horizontal/vertical shiplap, tongue-and-groove planks, and traditional board-and-batten wainscoting. Accounts for profile tongue overlaps, nickel-gap spacing, and miter waste.
Buy 21 pieces of 16-ft shiplap (21 horizontal courses). Zero mid-wall butt joints needed!
| Accent Wall Dimensions | 14' Wide × 9' High (126 sq ft) |
|---|---|
| Plank Visible Face Reveal | 5.25 inches face width |
| Horizontal Rows / Courses | 21 courses from floor to ceiling |
| Total Linear Footage | 323.4 linear ft (with 10% waste) |
| Recommended Stock Purchase | 21 boards of 16-ft length |
| Wall Joint Aesthetic | Seamless (each board spans full wall width) |
How to Measure for Shiplap & Wainscoting Calculator
- For full accent walls, measure wall width and total wall ceiling height in feet.
- For wainscoting, measure room perimeter in feet (deducting door openings) and choose wainscot chair rail height (typically 36", 42", or 48" from floor).
- Measure actual visible plank face width (reveal) excluding the hidden tongue or rabbet flange (e.g. a nominal 1x6 shiplap board usually has a 5" to 5-1/4" visible face).
- Choose standard board lengths (8 ft, 12 ft, or 16 ft) to minimize mid-wall butt joints.
How the Calculation Works
Shiplap calculations determine the number of vertical courses required: `Courses = Ceil(Wall Height in / Visible Face Width in)`. Linear feet needed equals `Courses × Wall Width ft × 1.10 Waste`. For board-and-batten wainscoting, stiles (vertical battens) are spaced evenly across the wall length: `Stiles Count = Ceil((Wall Length in - Stile Width in) / (Spacing in + Stile Width in)) + 1`. Top rails, bottom baseboards, and chair rail cap molding run the full continuous room perimeter.
- Number of horizontal rows = ceil(108 / 5.25) = ceil(20.57) = 21 courses. Because the wall is 14 feet wide, one 16-foot board spans each course with zero mid-wall butt joints! Total boards needed = 21 boards of 16-foot stock (plus 1 extra for waste = 22 boards). Total linear feet = 21 × 14 × 1.10 = 323.4 linear feet.
Shiplap & Wainscoting Calculator Reference & Specifications
| Plank Profile & Nominal Size | Visible Face Reveal | Overlap / Gap Style | Linear Ft per 100 Sq Ft |
|---|---|---|---|
| 1 × 4 Shiplap | 3-1/4" (83 mm) | 1/8" Nickel-gap rabbet | 369.2 linear ft |
| 1 × 6 Shiplap (Standard) | 5-1/4" (133 mm) | 1/8" Nickel-gap rabbet | 228.6 linear ft |
| 1 × 8 Shiplap (Wide Plank) | 7-1/8" (181 mm) | 1/8" Nickel-gap rabbet | 168.4 linear ft |
| 1 × 6 Tongue & Groove (V-Groove) | 5.0" (127 mm) | Interlocking tongue & groove | 240.0 linear ft |
| Board & Batten Vertical Stiles | 2-1/2" to 3-1/2" Batten | Spaced 12" to 16" on center | Varies by wall length |
| Beadboard Wainscot Sheet (4×8) | 48" Wide Sheet | Traditional 1-1/2" bead spacing | 32 sq ft per sheet |
Frequently Asked Questions About Shiplap & Wainscoting Calculator
What is the standard reveal on 1x6 shiplap?
A nominal 1x6 shiplap board is 5-1/2 inches wide overall, but features a 1/4-inch to 3/8-inch recessed rabbet edge for the interlocking lip. This leaves an actual visible face reveal of approximately 5-1/8 to 5-1/4 inches once installed on the wall.
What height should board-and-batten wainscoting be installed?
Classic architectural guidelines recommend installing wainscoting at one-third of the total ceiling height. For standard 8-foot (96") ceilings, ideal wainscot height is 32 to 36 inches to the top of the chair rail. For 9-foot ceilings, 36 to 42 inches looks balanced. High two-thirds Craftsman wainscoting is typically installed at 54 to 60 inches.
Do I need to nail shiplap into wall studs?
Yes. For horizontal shiplap, blind-nail (or face-nail) 2-inch 16-gauge or 18-gauge finish nails directly into wall studs spaced 16 inches on center. If installing shiplap vertically, you must first install horizontal 2x4 blocking between studs or fasten 1/2" plywood furring strips every 16 to 24 inches up the wall.
How do I space board-and-batten vertical stiles evenly across a wall?
Measure wall length in inches and subtract the width of one stile. Divide by your desired spacing (e.g. 14 inches) to find the number of interior bays. Round to the nearest whole integer. Divide the total remaining space by that number to get the exact center-to-center spacing for every stile.
Should shiplap be acclimated before installation?
Yes. Natural wood shiplap (pine, cedar, or poplar) must acclimate inside the climate-controlled room for at least 72 hours before installation. MDF shiplap requires at least 48 hours. This prevents shrinking that reveals unpainted primer lines or expansion that causes boards to buckle off the wall.