What this calculator does
Board and batten siding works out battens needed to cover a wall at a chosen spacing, plus base board coverage. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaBattens = ⌊wall width / spacing⌋ + 1; boards = ⌈wall width / board width⌉
The inputs explained
| Field | What to enter |
|---|---|
| Wall width (m) | A number, measured in m. Starts at 6. |
| Wall height (m) | A number, measured in m. Starts at 2.4. |
| Batten spacing (centre to centre) (mm) | A number, measured in mm. Starts at 400. |
| Batten width (mm) | A number, measured in mm. Starts at 45. |
| Base board width (mm) | A number, measured in mm. Starts at 150. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with wall width
Every other input is held at the calculator’s starting values while wall width varies. Select any row to load that scenario into the calculator.