Shiplap Calculator

Shiplap is a style of wooden board installed horizontally across walls, popular in rustic and modern farmhouse interiors — the Shiplap Calculator tells you exactly how many boards to buy for your project. Enter your wall length, wall height, and optional window/door dimensions to subtract cutouts, then set your board length, board face width, and waste factor to get the total boards needed. Secondary outputs include wall area, linear feet required, and an estimated total cost if you enter a price per square foot.

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Total width of windows/doors to subtract

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Total height of windows/doors to subtract

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Visible width after overlap

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Leave blank to skip cost calculation

Results

Boards Needed

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Wall Area

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Linear Feet Required

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Total Cost

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Frequently Asked Questions

What is shiplap and why is it popular?

Shiplap is a type of wooden board with overlapping joints created by rabbeted edges. It's popular for interior walls because it creates a rustic, farmhouse aesthetic while providing a durable, gap-free surface.

How do I calculate how much shiplap I need?

Calculate your wall area (length × height), subtract any windows or doors, then divide by the coverage area of your boards. Add 10-15% waste factor for cuts and mistakes.

What board width should I choose for shiplap?

Common shiplap widths are 4", 6", and 8". Wider boards (6-8") create fewer seams and work well in larger rooms, while narrower boards (4-5") suit smaller spaces and create more visual lines.

Why do I need a waste factor for shiplap?

The waste factor accounts for cuts around windows, doors, outlets, and mistakes during installation. A 10-15% waste factor is typical for shiplap projects.

Can shiplap be installed vertically instead of horizontally?

Yes, shiplap can be installed vertically for a different aesthetic effect. Vertical installation can make ceilings appear higher and works well as an accent wall feature.

How much does shiplap typically cost per square foot?

Shiplap costs vary widely from $2-8 per square foot depending on wood type and quality. Pine is most affordable, while cedar and reclaimed wood cost more but offer better durability and appearance.

Do I need special tools to install shiplap?

Basic tools include a miter saw, level, stud finder, nail gun or hammer, and measuring tape. A table saw helps if you need to rip boards to custom widths.