Board & Batten Calculator

Q: How far apart should board and batten be?

Common board and batten spacing ranges from 12 to 20 inches between battens. The ideal spacing depends on the room size and wall width. Tighter spacing (10 to 14 inches) suits smaller walls or half-wall accents, while wider spacing (16 to 22 inches) creates an open, balanced look on full-height walls.

Q: Do I include the batten width when calculating spacing?

Yes. Clear spacing is the distance between the inside edges of adjacent battens, whereas center-to-center spacing includes one full batten width. When cutting spacer blocks, always use the clear gap measurement.

Q: Should board and batten start at the edge of the wall?

In most installations, edge battens sit flush against the left and right corners. However, if your wall ends at an existing door casing or window trim, you can omit edge battens and let the first and last gaps terminate at the existing trim.

Q: How much extra material should I buy?

A 10% waste allowance is standard for straight board and batten cuts to cover defect cutoffs, end trimming, and bad cuts. If your walls are heavily out of plumb or you are buying shorter board lengths with more joints, consider 15% waste.

Wall Dimensions

Wall Width (in)

Wall Height (in)

Layout Details & Rails

Include Edge Battens (First & last battens sit on wall edges)

Horizontal Top Rail (3.5" header / cap)

Bottom Base Rail (Above existing baseboard)

Additional Mid Horizontal Rail (Two-tier grid)

Stock & Waste Settings

Waste Allowance (%)

Stock Board Length (in) 8ft = 96", 10ft = 120"

Optional Price Per Board ($)

Component	Count	Length / Detail
Vertical Battens	8	89.00 in each
Total Vertical Trim	-	712.00 in (59.33 ft)
Horizontal Rails	2 rails	288.00 in (24.00 ft)
Total Linear Requirement (w/ 10% waste)	-	1100.00 in (91.67 ft)
Boards to Purchase (8ft / 96in pieces)	12	Est. Cost: $90.00

Component

Count

Length / Detail

Vertical Battens

89.00 in each

Total Vertical Trim

712.00 in (59.33 ft)

Horizontal Rails

2 rails

288.00 in (24.00 ft)

Total Linear Requirement (w/ 10% waste)

1100.00 in (91.67 ft)

Boards to Purchase (8ft / 96in pieces)

Est. Cost: $90.00

How to Use the Board and Batten Calculator

Measure the full width of the wall before choosing a layout. Enter the batten width you plan to use, then choose whether you want to start with a fixed number of battens or an approximate gap. If the first and last battens will sit against the wall edges, leave the edge-batten option enabled.

The result shows the exact clear space between battens as well as the center-to-center measurement. Use the clear gap when cutting spacer blocks; use the center-to-center figure when marking layout lines.

How Board and Batten Spacing Is Calculated

An even layout has to account for the width of the battens themselves. The usable space is the wall width minus the combined width of all battens. That remaining distance is divided by the number of gaps in the layout.

// When edge battens are included (N ≥ 2 battens across wall width W, batten width B):

Number of gaps = N - 1

Clear Gap G = (W - (N × B)) / (N - 1)

Center-to-Center C = G + B

// When edge battens are NOT included:

Number of gaps = N + 1

Clear Gap G = (W - (N × B)) / (N + 1)

Worked Calculation Example

Wall width: 144 in

Battens: 8

Batten width: 2.5 in

Edge battens included

1. Total batten width: 8 × 2.5 = 20 in

2. Remaining space: 144 - 20 = 124 in

3. Gaps: 8 - 1 = 7 gaps

4. Clear spacing: 124 / 7 = 17.71 in

5. Center-to-center: 17.71 + 2.5 = 20.21 in

Before You Buy the Trim

Real walls are rarely perfect. Measure at more than one height, especially in older rooms, and base the layout on the dimension that matches where the trim will actually sit. Add a waste allowance for bad cuts, defects, and boards you may need to match for appearance.

Frequently Asked Questions

How far apart should board and batten be?

Spacing typically ranges from 12 to 20 inches depending on ceiling height and overall wall width. Narrow walls or half-wall board and batten look best with 10 to 14 inch spacing, while wide primary accent walls frequently look balanced around 16 to 18 inches.

Do I include the batten width when calculating spacing?

Yes. Clear gap is the visible drywall space between boards. Center-to-center adds one board width to that gap. When cutting a wooden spacer block for installation, use the clear gap.

Should board and batten start at the edge of the wall?

Yes, if you want full corner framing. If you are meeting existing door trim, casing, or window frames, you can turn off edge battens and space interior boards equally between the casings.

How much extra material should I buy?

We recommend a 10% waste allowance. This covers snipping off factory rough ends, defective or warped lumber, and minor cut errors.