🪟Shiplap Calculator
Find how many shiplap boards you need for a wall, minus doors and windows.
Your wall
You'll need about
25 boards
81.0 sq ft · 194 linear ft (incl. 10% waste)
sq ft
81.0
linear ft
194
boards
25
🛒 Shopping list
- Shiplap boards (6.0 in, 8 ft)25 boards
Exposure is the part you see once the boards overlap — usually about half an inch less than the board's width.
How it works
Area = width × height − openings. Linear feet = area × 12 ÷ exposure (the visible face), plus waste. Boards = linear feet ÷ board length, rounded up.
Worked example
A 12 × 8 ft wall minus 15 sq ft of window = 81 sq ft. With 5½ in exposure: 81 × 12 ÷ 5.5 × 1.1 = 194 linear feet, or 25 boards at 8 ft.
Questions people ask
The part of each board you see after it overlaps the next.
More calculators you might like
Email me my results
Pop in your email and keep your numbers handy at the store.
Last updated October 8, 2026. These results are friendly estimates to help you plan — always double-check before buying or making big decisions.