How this calculator works
Battens (the narrow strips) go over a flat wall at an even spacing, with one at each end. If there are n battens, there are n − 1 gaps between them, so the wall width is the battens plus the gaps. For a gap you want, work out roughly how many battens that gives, round it to a whole number, then use that number to find the exact gap that makes the spacing come out even.
Worked example: a 12 ft (144 in) wall with 1×3 battens (2.5 in) and a 12 in target gap: (144 + 12) ÷ (2.5 + 12) = 10.8, rounded to 11 battens. The exact gap is (144 − 11 × 2.5) ÷ 10 = 11.65 in, so the battens sit 14.15 in apart center to center. Full-height 8 ft battens use 88 ft of board, and a top rail adds the 12 ft width.
Battens and exact gap for common wall widths (1×3 battens, 12 in target gap)
Change the batten board or the gap in the calculator above for yours.
| Wall width | Battens | Exact gap | Center to center |
|---|---|---|---|
| 6 ft | 6 | 11.40 in | 13.90 in |
| 8 ft | 7 | 13.08 in | 15.58 in |
| 10 ft | 9 | 12.19 in | 14.69 in |
| 12 ft | 11 | 11.65 in | 14.15 in |
| 14 ft | 12 | 12.55 in | 15.05 in |
| 16 ft | 14 | 12.08 in | 14.58 in |
Tips before you buy
- Choose the gap by looking at it, not by the number: tape or chalk a few battens on the wall at 10, 12 and 14 in and step back. Narrow gaps look more formal, and wide ones more modern.
- Use a spacer block cut to the exact gap, with a level, so that every batten sits at the same distance. A small error that repeats 11 times becomes a big one.
- Prime and paint the boards before you nail them on, then fill the nail holes and caulk the edges and finish with a second coat. Painting after is faster to fix, but messier.
- Find the studs first: nail or glue the battens to the studs where you can, and use construction adhesive between them. A brad nailer makes the job go quickly.
- Outlets and switches in the wall will need extension rings so the plates sit flat over the battens. Plan them before you begin.
- If the wall is not square, work from the middle outward and let the end battens be trimmed to fit the corner.
Tools & materials for this project
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Frequently asked questions
How far apart should board and batten battens be?
Between 8 and 16 in of gap is typical, and 12 in is the most common. The calculator rounds to a whole number of battens and gives the exact gap, so that they fit the wall evenly.
How many battens do I need for a 12 ft wall?
With 1×3 battens and about a 12 in gap, 11 battens, with the exact gap at 11.65 in and the battens 14.15 in apart center to center.
What size boards should I use for battens?
1×2, 1×3 and 1×4 boards are the usual choices. Wider battens (1×4) look bolder, and narrower ones look lighter. A true 1×3 board is 2.5 in wide.
Do I measure the gap or the center to center?
Either one. The calculator gives both: the clear gap on the wall, and the center to center distance, which is the gap plus the batten width.
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Related calculators & guides
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check your local code and your supplier's guidance before ordering.