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Calculator Answers

Board and Batten Calculator

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A board and batten calculator is a woodworking and siding utility used to estimate materials and layout dimensions for vertical panel walls. In siding mode, it calculates the number of wide panels (boards) and joint strips (battens) to fully cover a wall. In accent wall mode, it computes the exact number of spaced vertical battens and calculates uniform gaps (spacing) between them to ensure a balanced, symmetrical installation.

Design your board and batten siding or interior accent wall. Calculate the total boards and battens needed, and get precise measurements for layout spacing.

See also: Board Foot Calculator and Deck Board Calculator.

Quick Answer

Calculate boards, battens, and actual panel spacing for siding or interior accent walls. Enter wall dimensions, panel widths, and spacing preferences.

in
in

Used to estimate lengths of wood needed.

in

Width of the battens (e.g. 2.5 in for 1x3, 1.5 in for 1x2).

in

Width of the siding panels (e.g. 5.5 in for 1x6, 7.25 in for 1x8).

Material Estimate

Siding panels + battens

15 boards + 16 battens

At 8 in actual spacing

Wall width120 in
Wall height96 in
Battens required16
Boards required15
Actual spacing (gap width)8 in

Note: We recommend purchasing 10% extra material to cover waste, cut errors, and board defects.

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Examples

120 in wall width, 8 in boards, 2.5 in battens (Siding)

15 boards, 16 battens

144 in accent wall, 12 in target spacing, 2 in battens (Accent)

12 battens, actual spacing: 10.91 in

96 in wall, 5.5 in boards, 1.5 in battens (Siding)

18 boards, 19 battens

How it works

The calculator operates in two modes:

Siding (Full Coverage) Mode: Boards are placed side-by-side to cover the entire wall width, with battens covering each seam.

Number of Boards = Ceil(Wall Width ÷ Board Width)
Number of Battens = Number of Boards + 1

Accent Wall (Spaced) Mode: Battens are placed on a flat wall with open space (gaps) between them.

Number of Battens = Round((Wall Width − Batten Width) ÷ (Batten Width + Target Spacing)) + 1
Actual Spacing = (Wall Width − (Number of Battens × Batten Width)) ÷ (Number of Battens − 1)

Related Calculators

More tools from Home

Board Foot CalculatorCalculate board feet for lumber from thickness, width, length, and quantity, with an optional cost estimate from a price per board foot.Deck Board CalculatorEstimate the deck boards needed from deck size, board width, board gap, board length, and a waste allowance, with an optional cost estimate.

Frequently asked questions

Board and batten is a design style characterized by wide vertical panels (boards) separated by narrow wooden strips (battens) covering the seams. It is popular for exterior house siding as well as interior accent walls.

For exterior siding, standard board widths are 8, 10, or 12 inches, with battens spaced accordingly. For interior decorative accent walls, spacing varies widely from 8 inches up to 18 inches depending on aesthetic preference and wall size.

For accent walls, the calculator divides the wall width (minus the width of one outer batten) by the width of one board plus one batten. It rounds this to find a whole number of panels, then works backward to distribute the remaining space evenly so that all board gaps are exactly equal.

We recommend adding a 10% waste allowance to your board and batten counts to account for cutting errors, wood knots, or boards that are warped/twisted.