Calculated result
31boards
Boards to buy
Formula
LBR-SHP-001ceil(wall width ÷ exposed face) × ceil(height ÷ stock) × (1 + waste)
28 courses
Courses across the wall
96 ft²
Net wall area
Lumber & framing calculator
Shiplap
Shiplap board count from wall width, height and the exposed face after overlap, rounded to whole sticks of the stock length you buy.
Reviewed formula · v1.0.0
Project inputs
Enter field measurements. Imperial lengths take feet and inches. Unit conversion happens before the reviewed formula is applied.
All values can be refined when you edit the estimate. This tool does not replace field verification or local requirements.
Transparent cost view
Planning rates only. Pick a currency — badges, inputs, and totals follow. Material is a rate. Labour is hours × a planning hourly rate. Equipment and delivery are this-job amounts.
Planning defaults are office figures, not a bid. US ready-mix in 2026 often lands around $125–165 per cubic yard delivered; place-and-finish commonly $2–4 per square foot. Replace every rate with a supplier or crew quote before you send the letter.
Indicative FX as of Aug 2026. Planning conversion, not a live bank rate.
Material costUSD 2,635
Labour (8 h)USD 280
Direct costUSD 3,025
Overhead + contingencyUSD 303
Markup + taxUSD 399
Estimated project totalUSD 3,727
How this calculator works
A transparent shiplap takeoff.
Count boards across the wall from the exposed face after overlap, then multiply by pieces per course from wall height and stock length, with a visible cutting allowance before whole-board rounding.
Worked example. Example: a 12 ft wall of 5.25 in exposed 1×6 at 8 ft high, 8 ft stock and 10% waste rounds to 31 boards.
- 1. Measure the wall width the boards run across, not the room perimeter unless every wall is the same.
- 2. Enter the exposed face after the rabbet, not the nominal 1×6.
- 3. Openings can sit in waste on an accent wall, or as door and window deductions on a full-room clad.
Need the broader workflow? Read the lumber & framing planning guide.
Questions
Questions about shiplap
Nominal 1×6 or exposed 5.25 in?
The takeoff uses the visible face after overlap. A 1×6 shiplap is often about 5.0–5.25 in exposed. Measure a board if you have one.
Does this include trim?
No. Inside corners, outside corners and a finish cap are separate linear lines.
What is the formula ID?
This calculator publishes formula LBR-SHP-001, version 1.0.0. The ID stays on the result and on the estimate line.
Is this engineering advice?
No. Construclytic is a planning website, not a registered engineering or contracting firm. Field checks, codes and product data still sit with you.
Does Construclytic fetch live supplier prices?
No. Costs use the rate you enter. Construclytic does not fetch live supplier prices.