Wall plank material estimator

Shiplap Calculator

Estimate shiplap boards, linear footage, net wall area, waste, and rough material cost from wall size, openings, exposed face width, and stock board length. Useful before a lumber-yard or home-center run.

Units

Total wall length (ft)Wall height (ft)Openings to subtract (ft²)Exposed board face (in)Stock board length (ft)Waste / cuts (%)Cost per board ($)

Boards to buy

Linear shiplap

Net wall area

Rough cost

Shiplap layouts need board and wall checks

Board face width, tongue or overlap, wall flatness, inside corners, openings, pattern layout, paint grade, and long-run joints can change the final order. Confirm the exposed face width before buying.

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Estimate finish trim after wall boards are planned.

Paint Calculator

Estimate paint or primer for the wall covering.

Drywall Square Footage Calculator

Measure the wall area behind the finish surface.

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Shiplap formula

Net wall area = wall length × wall height - openings

Linear feet = net wall area ÷ exposed face width

Order length = linear feet × (1 + waste %)

Boards = order length ÷ stock board length

Sample takeoff

A 40 ft wall run at 8 ft high with 30 ft² of openings, 5.25 in exposed face, 12 ft boards, and 12% waste needs about 62 boards and 742 linear ft of shiplap.A 12 m wall run at 2.4 m high with 2.8 m² of openings, 135 mm exposed face, 3.6 m boards, and 12% waste needs about 60 boards and 216 linear m of shiplap.

Shiplap Calculator FAQ

How do I calculate shiplap boards?+

Find net wall area, divide by the exposed face width to get linear footage, add waste, then divide by stock board length.Find net wall area, divide by the exposed face width to get linear footage, add waste, then divide by stock board length.

Should I use actual board width or exposed face?+

Use exposed face width after the rabbet, tongue, groove, or overlap. The full board width usually overstates coverage.Use exposed face width after the rabbet, tongue, groove, or overlap. The full board width usually overstates coverage.

How much waste should I use?+

A straight wall may work near 10% to 12%. Add more for many openings, short returns, pattern matching, or stain-grade boards.A straight wall may work near 10% to 12%. Add more for many openings, short returns, pattern matching, or stain-grade boards.