Board and Batten Calculator

Your Board and Batten Wall Layout

The drawing places the battens across one uninterrupted wall width. After calculating, the position table gives each left edge and center measured from the same left-hand boundary. Use those cumulative marks instead of stepping along with a rounded gap.

Example only: 108 in wall, six 3 in battens, 18 in clear gaps. Height is illustrative.

How to Calculate Board and Batten Spacing

First remove the combined face width of the battens from the available wall width. Divide what remains by the number of clear spaces. With battens at both ends, six battens create five spaces; with open ends, those same six battens create seven.

On a 108 in wall with six 3 in battens at the edges, the timber occupies 18 in. The remaining 90 in divides into five 18 in clear gaps. The centers are 21 in apart. Entering 21 in as the clear gap would describe a different layout.

In maximum-gap mode, this board and batten spacing calculator chooses the smallest whole batten count that keeps each clear gap at or below your limit. It then adjusts all the gaps equally. That limit is your visual preference, not a required installation spacing.

Choose the End Treatment Before Marking

A change in the end treatment affects every mark, even when the wall width and batten count stay the same. Measure only the usable width: if separate corner trim already occupies part of the wall, leave that trim outside your input.

Try adjacent counts and tape the proposed positions onto the wall before fixing anything. A mathematically even pattern can still cross an outlet, switch or window trim. Calculate separated wall sections individually; subtracting an opening’s width from one long wall would lose its actual position.

Actual Width and Vertical Material Length

Measure the face of the stock you will install. A nominal lumber label is not a spacing measurement; the nominal vs actual lumber sizes guide explains that difference. Decorative trim and sheet-cut strips can have different dimensions from standard lumber.

If you enter a vertical cut length, the result multiplies it by the batten count. Six battens at 48 in use 24 linear feet of vertical material before cuts or spares. That does not mean three 8 ft boards will always yield six pieces: saw kerf, end trimming and defects must fit within the purchased lengths.

This board and batten wall calculator plans decorative vertical strips. Horizontal rails, caps and backing sheets are separate quantities; use the plywood calculator if you need a backing-area estimate. Exterior siding systems require product-specific seam coverage and attachment details, which this decorative layout does not specify.