Shiplap Calculator

Estimate shiplap boards to cover a wall.

How the Math Works

The Shiplap Calculator uses a formula that first calculates the total wall area by multiplying height and width. It then factors in waste (typically 10-15%) by multiplying the area by (1 + waste percentage). Finally, it divides this adjusted area by the coverage per board, which is determined by converting the board's face width from inches to feet (divided by 12) and multiplying by its length in feet. This gives the number of boards needed, ensuring accurate material estimates while accounting for cutting and installation losses.

Practical Applications

To apply this calculator, start by measuring your wall's height and width in feet to determine the total area. Next, input the face width of your shiplap boards in inches and their length in feet. Add an estimated waste percentage (e.g., 10% for standard projects or higher for complex cuts). The calculator will automatically convert the board dimensions to calculate coverage per board and divide the adjusted area by this value, providing the exact number of boards required for your project.

Day-to-Day Use

This tool simplifies home improvement planning by eliminating guesswork and reducing material waste. Whether you're renovating a bedroom wall, building a porch, or installing shiplap as a design feature, accurate calculations prevent underbuying (which delays projects) or overbuying (which wastes money). By quickly estimating materials, you save time, avoid multiple shopping trips, and ensure your project stays on budget and schedule—making DIY shiplap installation accessible to beginners and professionals alike.

Worked example

200 ft², 5.5 in × 8 ft boards, 10% → 61 boards.

FAQ