# Board and Batten Calculator

URL: https://speedycalculator.com/calculators/construction/board-and-batten/
Last updated: 2026-10-25

> The board and batten calculator lays out a board-and-batten wall: it finds the number of battens, the exact spacing between them, the linear footage and pieces of batten to buy, the backing panels and the total cost.

## Inputs

- Wall width (ft, m, in, yd, cm)
- Wall height (ft, m, in, yd, cm)
- Batten width (in, cm, mm, ft, m)
- Target gap between battens (in, cm, mm, ft, m)
- Batten stock length
- Waste (%)
- Price per batten piece (/piece)
- Price per 4 × 8 backing panel (0 if none) (/piece)

## Results

- Number of battens
- Exact gap between battens
- Total batten length
- Batten pieces to buy
- Backing panels (4 × 8)
- Total cost

## Formula

```
n = round((W − b) ÷ (s + b)) + 1
Exact gap = (W − n × b) ÷ (n − 1)
Batten length = n × wall height
```

## Explanation

Board and batten is a classic siding pattern that has become popular on interior feature walls. Vertical battens are fixed over panels or boards at regular intervals; the look depends on getting equal spacing from one end of the wall to the other, with a batten at each edge.

### How to use the Board and Batten Calculator

- **Wall width**
- **Wall height**
- **Batten width**
- **Target gap between battens**
- **Batten stock length**
- **Waste**
- **Price per batten piece**
- **Price per 4 × 8 backing panel (0 if none)**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter the wall width and height, the batten width and the spacing you would like. The calculator rounds to a whole number of battens, recalculates the exact gap, and works out batten pieces from the stock length and backing sheets from the wall area.

### Tip

If the exact gap is awkward to measure, adjust the batten width or target gap until it comes out to a simple fraction – for example 15¾ in instead of 15.73 in.

### Tips for an accurate estimate

- Sketch the job and split irregular areas into rectangles, circles and triangles before you measure.
- Add a waste allowance – typically 5–10% for simple layouts and 15–20% for diagonal, curved or heavily cut work.
- Check the coverage or yield printed on the product, because sizes and densities vary between manufacturers.
- Buy all units of a finished material (tile, brick, siding) from the same batch so colours match, and keep a few spares for repairs.
- Confirm local prices – quarry, lumber and steel prices vary widely by region and season.

### Common mistakes to avoid

- Ordering exactly the calculated amount with no allowance for breakage, offcuts and settlement.
- Forgetting to subtract doors, windows and other openings – or subtracting small ones that still need cutting around.
- Confusing US short tons (2,000 lb) with metric tonnes (1,000 kg) when comparing quotes.

### Inputs explained

FieldWhat to enterWall widthUnits: ft, m, in, yd, cmWall heightUnits: ft, m, in, yd, cmBatten widthUnits: in, cm, mm, ft, mTarget gap between battensUnits: in, cm, mm, ft, mBatten stock lengthChoose one: 8 ft, 10 ft, 12 ft, 16 ft …WasteIn %Price per batten pieceUnits: /piecePrice per 4 × 8 backing panel (0 if none)Units: /piece

### What each result means

- **Number of battens** = round(([Wall width] - [Batten width])÷([Target gap between battens] + [Batten width])) + 1
- **Exact gap between battens** = ([Wall width] - [Number of battens]×[Batten width])÷([Number of battens] - 1)
- **Total batten length** = [Number of battens]×[Wall height]
- **Batten pieces to buy** = ceil([Number of battens]×ceil([Wall height]÷[Batten stock length] - 0.000001)×(1 + [Waste]÷100))
- **Backing panels (4 × 8)** = ceil([Wall width]×[Wall height]÷2.9729×(1 + [Waste]÷100))
- **Total cost** = [Batten pieces to buy]×[Price per batten piece] + [Backing panels (4 × 8)]×[Price per 4 × 8 backing panel (0 if none)]

### Example values

How the main result changes when **Wall width** changes and everything else stays at the example values above:

Wall width (ft)Number of battens6597129151118132416

## Worked example

Inputs — Wall width: 12 ft; Wall height: 8 ft; Batten width: 2.5 in; Target gap between battens: 16 in; Batten stock length: 8 ft; Waste: 10 %; Price per batten piece: $6 /piece; Price per 4 × 8 backing panel (0 if none): $35 /piece.

Results — **Number of battens = 9**; Exact gap between battens = 15.188 in; Total batten length = 72 ft; Batten pieces to buy = 10; Backing panels (4 × 8) = 4; Total cost = $200.00.

## FAQ

**What spacing is typical for board and batten?**
12–24 in between battens on exterior siding; 12–18 in looks best on interior feature walls.

**How wide should the battens be?**
2–3½ in for interior walls and 2½–3½ in on exterior siding.

**Should there be a batten at each end?**
Yes – this layout assumes battens at both edges, so the pattern looks balanced.

**What formula does the Board and Batten Calculator use?**
n = round((W − b) ÷ (s + b)) + 1.