Board and Batten Calculator - Free Material Estimator Tool
Calculates the boards, battens, linear feet, and square footage needed for a board and batten wall from its width, height, and board and batten sizes.
Board and Batten Calculator
Input Parameters
Results
Calculation Formulas
Boards = Ceiling(Wall Width ÷ Board Width)
Battens = With corner battens: Boards + 1, Without: Boards - 1 (one batten per seam between boards)
Total Material = (Boards + Battens) × Wall Height
Wall Visualization
Documentation
Board and Batten Calculator
A board and batten calculator works out how many boards and battens a wall needs, plus the total linear feet and square footage of material to buy. It uses the wall's height and width, the board width, and the batten width.
What board and batten is
Board and batten is a wall covering made of wide vertical boards with narrow strips of wood, called battens, nailed over the seams between them. Builders use it on house exteriors, barns, and interior accent walls. The battens hide the gaps between boards and add a ridged, shadow-lined texture to the surface.
Most boards run 6 to 12 inches wide. Battens are usually 1 to 3 inches wide. Builders use solid wood, fiber cement, engineered wood, or vinyl, depending on the budget and how much upkeep the owner wants to do.
How to calculate the number of boards
The calculator converts the wall width from feet to inches, then divides it by the board width. It rounds the result up to the next whole number, since a wall cannot be covered with part of a board.
Example. A wall is 10 feet wide (120 inches). The boards are 8 inches wide.
The wall needs 15 boards. Note that a board sold as a "1x8" is not actually 8 inches wide; it usually measures about 7.25 inches. Use the real, measured width, not the name printed on the label.
How to calculate the number of battens
Battens cover the seams between boards, so the batten count follows from the number of boards, not from the batten spacing. Fifteen boards placed side by side leave 14 seams, so 14 battens cover them. If the design also adds a batten at each outer edge of the wall — the "corner battens" — two more battens are added.
Example. With 15 boards: 16 battens with corner battens, or 14 without.
The calculator also asks for a batten spacing value, in inches. This does not change how many battens are needed, since the battens sit at the board seams, not at even intervals. The field exists so the tool can check that the entered batten width is smaller than the spacing; if it is not, the calculator shows an error, because a batten cannot be wider than the gap it is meant to fill.
How to calculate total linear feet
Linear feet is the total length of board and batten material needed, useful because lumber is often priced by the foot.
Example. A wall 8 feet tall with 15 boards and 16 battens (corner battens on):
How to calculate total square footage
Square footage is useful for estimating paint or stain.
Example. With 15 boards 8 inches wide, 16 battens 2 inches wide, and an 8-foot wall height:
Worked example
A 10-foot-wide, 8-foot-tall wall gets 8-inch boards and 2-inch battens, with corner battens included. The wall needs 15 boards and 16 battens, 248 linear feet of material in total, and covers about 101.3 square feet.
Accounting for waste
Most builders buy 10 to 15 percent more material than the calculator returns. Boards get miscut, some pieces arrive warped or knotted, and cuts around windows, doors, and outlets create scrap that cannot be reused. Walls with several openings often need 15 to 20 percent extra. Leftover material is also useful for later repairs, since matching the wood color and grain years later is difficult.
A short history
Board and batten began as a practical way to seal gaps between rough-sawn boards on barns and early houses; a strip of wood nailed over each seam kept out wind and rain. The vertical boards also shed water better than horizontal siding, which mattered before modern house wraps and flashing existed.
In the mid-19th century, the American architect Andrew Jackson Downing promoted board and batten as a deliberate style for country houses and churches in his 1850 book The Architecture of Country Houses, helping turn a practical fix into a design choice. Mass-produced siding later pushed it out of common use, though it stayed common on barns. It has since returned as a popular finish for both house exteriors and interior accent walls.
Frequently asked questions
What is board and batten siding?
It is a wall covering of wide vertical boards with narrower strips, called battens, nailed over the seams between them. It is used on exteriors and, increasingly, on interior accent walls.
How many battens does a wall need?
The number of battens equals the number of boards minus one, since each seam between two boards takes one batten. If corner battens are added at both edges of the wall, the count becomes the number of boards plus one instead.
Does the batten spacing input change how many battens are needed?
No. Battens are placed at the seams between boards, so their count depends only on the number of boards and whether corner battens are included. The spacing value is used only to check that the batten width is smaller than the gap it will fill.
How much extra material should be bought for waste?
About 10 to 15 percent above the calculated amount, or 15 to 20 percent for walls with several windows or doors.
What board width is typical?
Most projects use boards 6 to 12 inches wide with battens 1 to 3 inches wide. Interior accent walls often use narrower boards, around 6 inches, to keep the pattern in proportion with the room.
What is the difference between board and batten and reverse board and batten?
Standard board and batten uses wide boards and narrow battens. Reverse board and batten, sometimes called batten board, uses wide battens over narrower boards, giving a different visual proportion.