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Board and Batten Calculator

Space battens evenly between flush edge battens and download each left- and right-edge position.

Your numbers

Make it your own
Updates as you type
Equal clear gap between battens
20.4in

Calculated from your inputs · rounded for display

120 inches · 6 battens
Use the coordinate table for precise placement.
Batten count including both edges6
Center-to-center spacing23.4in

Both edge battens are included in the wall width. Coordinates are measured from the left wall edge; openings are not included.

Your calculation, step by step

No black boxes
  1. With battens flush to both edges, count = 5 spaces + 1.
  2. Clear gap = (120 − 6 × 3) / 5.
Detailed results · 6 entries
BattenLeft edge (in)Right edge (in)
103
223.426.4
346.849.8
470.273.2
593.696.6
6117120

What if things were different?

Save up to three scenarios, then change your inputs to compare the possibilities.

How to use this calculator

  1. Enter your own values in the labeled fields. Check the units and assumptions before comparing results. Only the fields needed for your selected calculation mode are shown.
  2. Your answer updates automatically. Review the calculation steps to see exactly how it was calculated.
  3. Copy, share, save, or download your result. Saved inputs stay on this device.

How the calculation works

Clear gap = [wall width − (spaces+1) × batten width] / spaces

This layout places a full batten flush to each wall edge. Choosing the number of clear spaces fixes the total batten count. Coordinates are measured from the left edge; openings and corner overlaps are outside this rectangular layout. Review the units, period and assumptions before comparing scenarios. Displayed values are rounded, while the underlying calculation retains its available precision.

A worked example

A 120-inch wall with six 3-inch battens has five equal gaps: (120−18)/5 = 20.4 inches each.

Reading your result

Use the main result together with its units and supporting figures. Display values are rounded; calculations keep their underlying precision. A change in inputs or assumptions can change the answer. Compare the step-by-step working with your intended use before relying on an estimate.

Frequently asked questions

What assumptions does this calculation use?

This layout places a full batten flush to each wall edge. Choosing the number of clear spaces fixes the total batten count. Coordinates are measured from the left edge; openings and corner overlaps are outside this rectangular layout.

Can I save or check a scenario?

The result includes the working and supporting values. Save and Restore keep inputs on this device; Copy, Download and Print export the result. Sharing a scenario explicitly includes the inputs in its link.

Sources & methodology

This calculator uses the mathematical identity and assumptions stated above. No current rates, prices, or external data are loaded. Conversion tools use international unit definitions.

Formula review: October 24, 2026. Read our methodology.