Shiplap Calculator

To determine how many shiplap boards you need, measure your wall height and length, calculate the area, then subtract openings. Divide the project area by the area covered by a single board, and add 5-10% for waste. For example, an 80 ft² wall with 8-inch by 5-foot boards needs about 24 boards.

Yes, shiplap can be installed vertically, horizontally, or diagonally. Vertical installation adds visual height to a room, horizontal installation creates a wider appearance, and diagonal or herringbone patterns add original decorative appeal. The calculation method is the same regardless of orientation.

Standard shiplap board widths are 5.25 inches and 7.25 inches, though boards are available in various lengths and thicknesses. Common lengths range from 8 to 16 feet. Thicker and longer boards are more expensive. The rabbet (overlap) is typically 0.5 to 0.75 inches wide.

Shiplap costs vary by material: hardwood boards $2-$11/ft², cedar $2-$8/ft², pine $2-$7/ft², plywood $2-$3/ft², MDF $2-$10/ft², and PVC $1-$5/ft². Installation costs typically range from $1 to $4 per square foot depending on location and complexity.

Shiplap has rabbeted grooves on the top and bottom edges that overlap to create a tight joint, with a small gap between boards for visual effect. Tongue and groove has a protruding tongue on one edge that fits into a groove on the adjacent board, creating a flush, seamless surface. Shiplap is generally easier to install and remove.