Measure the full layout width
Choose where the left and right edges of your board and batten treatment will end. Measure horizontally between those points. This is the wall width you enter in the calculator.
For the layout this tool produces, one full-width batten sits at each end. Include their space in your measurement—do not subtract the end battens yourself.
Check the width near the top and bottom of the proposed treatment as well as midway up. If the readings differ, the edges may not be parallel. Record the readings and choose your layout line deliberately; do not assume every piece can share the same cut size.
Measure the actual batten face
Measure across the face that will be visible once the board is on the wall. That measurement is the batten width. The depth sticking out from the wall is its thickness, which is not used in the spacing formula.
Use a sample of the material you plan to install. Product names and nominal lumber sizes are not a substitute for measuring the actual board.
If the face measures 3½ inches, enter 3.5 or 3 1/2. Use the same unit for every dimension. This calculator accepts decimals and fractions; convert feet to total inches before typing them.
Set the height and account for rails
Mark the top of your intended treatment with a level reference line. Measure the overall height from the bottom of the treatment to that top line. In this calculator, the overall height includes the top and bottom rails you select.
Measure the face height of each horizontal rail separately. The tool assumes both rails run across the full wall width and that the vertical battens fit between them.
If you are keeping an existing baseboard
Choose one consistent approach:
- Include it in the overall height: select a bottom rail and enter the existing baseboard's face height. Ignore that existing piece in the generated cut list.
- Measure from above it: start the height measurement at the top of the baseboard and switch the bottom rail off.
Measure the actual opening at each batten position before making final cuts. A sloped floor or uneven rail can make the installed lengths differ from the ideal plan.
Map outlets, switches, and openings
Sketch the wall. From the same left-hand starting point, record the left and right edges of outlet covers, switches, windows, doors, and any trim that overlaps the proposed treatment. Record their heights too.
After calculating, compare those locations with each batten's left and right edges. A batten occupies a strip of space, so checking its center alone can miss a collision.
The calculator does not detect obstacles. Try a neighboring batten count, change the intended treatment area, or plan separate uninterrupted sections. Separate sections may need different spacing; check the complete wall visually before cutting.
Choose spacing, then dry-fit the layout
Open the Board and Batten Calculator and choose either a total batten count or an approximate clear gap. Your batten count includes both end boards.
Use the comparison options to see one fewer or one more batten. There is no single spacing that looks right on every wall. Check the proportions with painter's tape before committing to a layout.
A complete measurement example
| Measurement | Example value |
|---|---|
| Wall width | 120 in |
| Actual batten width | 3.5 in |
| Total battens | 6, including the ends |
| Overall treatment height | 48 in |
| Top / bottom rail heights | 3.5 in / 3.5 in |
Center-to-center = 19.8 + 3.5 = 23.3 in
Vertical batten length = 48 − 3.5 − 3.5 = 41 in
Mark batten left edges at 0, 23.3, 46.6, 69.9, 93.2, and 116.5 inches from the same left-hand starting point. The final board ends at 120 inches.
Use the calculator's absolute marking positions instead of repeatedly adding a rounded gap. Rounding each repeated step can accumulate an error across the wall.