Board & Batten Layout Calculator

How to use this calculator

Every field matters here. Here’s what each one does and why it exists.

Unit System — Toggle between mm, in, or ft. Pick the unit your tape measure uses. All fields switch together, so no manual conversion needed.

Wall Width — The full horizontal span of the wall you’re paneling. Measure from corner to corner (or from trim to trim if your wall has existing edge molding). Default is 3600 mm.

Wall Height — Floor to ceiling, or floor to where your paneling stops if you’re doing a half-wall treatment. Used to calculate batten lengths and material quantity.

Layout Mode — This is the key decision:

• Fixed Sections — You set the number of panels. The calculator figures out how wide each section needs to be.
• Desired Section Width — You set your target gap width. The calculator figures out how many sections fit and adjusts spacing to keep them equal.

Number of Sections — Active in Fixed Sections mode. How many panels you want the wall divided into. 5 sections on a 3600mm wall gives you 6 battens total (one on each side of every gap).

Desired Section Width — Active in the other mode. Your target gap between battens. The calculator auto-adjusts to equalize sections across the wall.

Batten Width — The width of each vertical strip. Typical range is 40–75mm. Narrower battens (40–50mm) read as more delicate; wider ones (70–75mm) feel bolder and more architectural.

Edge Margin (each side) — The gap from the wall’s edge to the first and last batten. Keeps the paneling from looking like it’s falling off the wall. 80–120mm is the common range.

Board Width (optional) — If you’re adding a horizontal background board behind the battens (the “board” in board and batten), enter its width here. Leave 0 if you’re running battens directly onto drywall.

Top & Bottom Trim (optional) — Height of the rail or trim piece at the top and bottom of the paneled section. Entered once and applied to both.

Hit Calculate Layout and the tool outputs batten positions from the left edge, section widths, total batten count, and a scaled wall diagram showing exactly where everything lands.

What problem this actually solves

Board and batten paneling has one rule that trips everyone up: the sections have to be equal.

Unequal gaps are immediately visible. Your eye reads the rhythm of vertical lines across a wall and the moment one gap is even 5mm wider than the others, the whole wall looks off. Professional installers know this. First-timers find out the hard way.

The math isn’t hard in isolation. Total wall width, minus edge margins on both sides, minus the combined width of all battens, divided by the number of gaps — that’s your section width. But then you need to recalculate if the section width comes out to an odd number. Or if you decide to change the batten width. Or if you realize the edge margin needs adjusting to make the sections equal. Every variable affects every other variable.

This calculator handles that loop. Change one input and everything recalculates instantly. You can iterate through 10 different configurations in 2 minutes instead of 20 minutes of manual arithmetic.

What board and batten actually is

Board and batten is a wall treatment made of vertical strips (battens) applied over a flat background surface. The “board” is the flat backing — either the wall itself, or a wide horizontal board applied first. The “batten” is the narrower vertical strip that sits on top of it.

Originally a barn siding technique, it moved indoors in the early 20th century as a way to add architectural character to plain rooms. Today it’s one of the most popular DIY wall treatments because the materials are cheap, the installation is forgiving, and the visual impact is significant.

The appeal of board and batten is the contrast: a flat, unbroken wall feels static. Add evenly spaced vertical lines and the wall suddenly has rhythm, proportion, and depth — even before you paint it.

The style works equally well as a full-height treatment (floor to ceiling) or a wainscoting-height treatment (typically 90–120cm, capped with a rail). Half-wall versions are more common in hallways, dining rooms, and children’s rooms. Full-height treatments suit living rooms and entryways where you want a more dramatic statement.

The layout formula explained

The core calculation is one equation, but it hides a few decisions inside it.

In plain terms: you subtract the margins and all the batten widths from the total wall width. What’s left gets divided equally between the sections.

The position formula works from left to right. The first batten sits at the edge margin. Each subsequent batten is one section width plus one batten width further along. The last batten should land exactly at (Wall Width - Edge Margin - Batten Width).

Board and batten anatomy — visual reference

Here’s how a standard board and batten wall breaks down across its width:

BATTEN BATTEN BATTEN BATTEN BATTEN

S1 S2 S3 S4

Real-world examples

Living room feature wall

A 4200mm wide living room wall, 2700mm high. The homeowner wants a bold, architectural look with wider battens.

Hallway wainscoting

A narrow hallway, 900mm wide, paneling to 1100mm height. The goal is 3 equal sections.

Matching an existing room

You’re paneling a second bedroom to match the first, where the gaps are 550mm. You want the calculator to tell you how many sections fit on a 3200mm wall.

Common mistakes that ruin board and batten layouts

Not accounting for edge margins. Some DIYers run the first batten right at the wall edge or at the corner trim. Without a proper margin, the paneling looks like it’s running off the wall. 80–120mm from the edge gives the eye a resting point before the pattern starts.

Using section count instead of gap count. 4 sections need 5 battens, not 4. This sounds obvious but it’s the single most common purchasing mistake. Always: battens = sections + 1.

Buying timber to wall height without accounting for waste. Standard timber lengths are 2.4m, 3.0m, and 4.8m. A 2700mm wall height means every 2.4m length is wasted. Either buy 3.0m lengths and cut down, or buy 2.7m custom lengths if your supplier offers them.

Skipping the dry layout. Before nailing anything, mark every batten position on the wall with a pencil line and stand back. What looks right on paper can feel cramped or sparse at full scale. The calculator’s diagram helps, but nothing replaces marks on an actual wall.

Ignoring power outlets and light switches. Run batten positions through your head against where the switches are. A batten landing directly over an outlet is annoying to work around and looks poor. Adjust the edge margin or section count to route around fixed obstacles.

Batten spacing — what actually looks good

There’s no single right answer, but there are ranges that read as intentional versus cramped or empty.

Section widths below 300mm start to feel busy. Above 650mm they begin to feel loose unless you’re using wider battens (70mm+) to anchor the spacing visually.

The batten-to-gap ratio matters too. A 50mm batten in a 600mm gap almost disappears. A 70mm batten in a 300mm gap dominates. Most designers aim for a ratio somewhere between 1:6 and 1:10 (batten width to section width) for a balanced look.

What the calculator outputs and how to use each result

Batten positions (from left edge) — These are your layout marks. Transfer them directly to the wall using a tape measure and pencil. Mark both top and bottom, then snap a chalk line or use a long level to connect them.

Section width — Cross-check this against your aesthetic intent. If it came out smaller than you expected, try reducing the section count by 1 and recalculating.

Total batten count — This is your cutting list for timber. Add 5–10% for waste, and round up to the nearest full length.

Material quantity — The calculator outputs linear metres of batten required. Divide by your timber length (2.4m, 3.0m, etc.) to get the number of pieces to buy. Always buy one extra piece.

Scaled wall diagram — Use this to visualize the layout before committing. Show it to the client or household before purchasing materials. Print it or screenshot it as a site reference.

Limitations and things to know before you start

The calculator works on flat, rectangular wall sections. It doesn’t account for doors or windows mid-wall. If your wall has an opening, you’ll need to treat each uninterrupted section as a separate wall and run the calculator twice (or more), then decide how the pattern resumes on either side of the opening.

It also assumes your battens are uniform width. Mixed-width layouts (where edge battens are wider than interior ones, for example) require manual adjustment to the formula.

The “Board Width” field is for horizontal backing boards, not the vertical ones. In traditional board and batten construction, the “board” is a wide horizontal plank and the “batten” covers the joint between boards. In modern interior applications, the terminology is often reversed or conflated — battens are the vertical strips, boards are optional horizontal rails. Make sure you know which configuration you’re building before ordering materials.

The bottom line

The layout math for board and batten isn’t complicated, but it’s fiddly enough that manual calculation leads to purchasing errors and installation headaches. The calculator removes that friction.

Put your wall dimensions in. Try Fixed Sections mode with 4 sections, then 5, then 6. Watch how the section width changes. Compare that to the Desired Section Width mode and see which one gives you proportions you like. The whole process takes 3 minutes.

Once you’ve got a layout you’re happy with, screenshot the diagram, note the batten positions, and take that to the hardware store. Everything else — the cutting, the fixing, the caulking, the painting — is just execution.