Calculated result
Adjust the editable example, then select Calculate.
Method and assumptions
Total batten width = count × batten width. Open space = wall width − total batten width. With a batten at each edge, divide by count − 1 internal gaps. With equal outer gaps, divide by count + 1 gaps. Target-gap mode selects the whole count (up to 500) whose resulting clear gap is closest to your target.
Worked example
On a 120-inch wall with seven 2-inch battens at both edges, open space is 106 inches across six gaps: 17.667 inches clear per gap.
Common mistake
A clear gap is not center-to-center spacing. Include batten width when comparing centers. Do not use a fractional batten count.
Planning limits
This is decorative finish-layout arithmetic, not a stud layout, baseboard quantity, substrate plan, or installation specification. Account separately for uneven walls, trim returns, outlets, and real field measurements.
Privacy
Measurements and results stay in this browser tab. The calculator does not send input values, store them, or place them in the URL. No account or upload is required.
Quick question
Can I start and end with open space instead?
Yes. Select equal outer gaps; the calculator divides remaining space among the two edge gaps and all internal gaps.