How do I calculate how much shiplap I need?

Measure wall width and height in feet, subtract openings, add waste, then divide by the coverage of one board. For layout accuracy, use exposed face width and board length.

What is exposed face width?

Exposed face width is the visible width after installation. Tongues, grooves, rabbets, and overlaps are hidden, so nominal board width can overstate actual wall coverage.

How much waste should I add for wall paneling?

Use 5-10% for a simple accent wall, 10-15% for windows, doors, outlets, or many end cuts, and 15-20% for pattern matching or visible board selection.

Can I use this for tongue-and-groove boards?

Yes. Enter the exposed face width from the product instructions or measure the visible face after the tongue is engaged.

Can I use this for wainscoting?

Use it for plank or beadboard coverage. Rails, stiles, caps, base trim, and panel spacing should be estimated separately.

Does the calculator include fasteners?

It gives a rough fastener count from board length and stud spacing. Use the manufacturer fastening schedule for final purchasing.

Does this include paint or trim?

No. It estimates paneling boards, packs, linear feet, coverage, and optional material cost. Paint, caulk, adhesive, trim, and outlet extensions are separate.

Wall Paneling Calculator

Estimate shiplap, tongue-and-groove, beadboard or wall paneling boards from wall size, exposed face width, board length, openings, waste, packs and cost.

Estimate one wall, ceiling, or known square-foot area for shiplap, tongue-and-groove, beadboard, or similar wall paneling. Use exposed face width, also called reveal width, because the tongue or overlap is hidden after installation.

Surface input

Wall size, ft

Wall width

Wall height

Board direction

Paneling profile

Common nominal 1x6 shiplap reveal.

Custom exposed face, in

Board length

Custom board length, ft

Waste, %

Openings, sq ft

Boards per pack

Stud spacing, in

Price

Openings reduce square footage but do not create a cut map. Add more waste for pattern matching, out-of-square walls, visible board selection, butt joints, returns, and first-time DIY work.

Boards to buy

Shiplap, exposed face 5.5 in, board length 8 ft

Material cost: $480.00

Net area

96 sq ft

With waste +10%

105.6 sq ft

Coverage bought

146.67 sq ft

Linear ft

320 linear ft

Packs

Fasteners

560 pcs

By area

29 boards

By layout

40 boards

Buy at least 40 boards. If the product is sold in packs of 6, round the order to 7 packs. Use manufacturer instructions for exact nailing, adhesive, acclimation, expansion gaps, and indoor or exterior suitability.

What the wall paneling calculator estimates

This wall paneling calculator estimates one rectangular wall, ceiling, accent wall, or known square-foot area for shiplap, tongue-and-groove, beadboard, nickel-gap planks, and similar paneling boards.

The key product input is exposed face width, also called reveal width or working width. It is the visible board width after the tongue, groove, or overlap is hidden by the next board.

Enter wall width and wall height in feet, or switch to a known square-foot area.
Choose horizontal or vertical boards for a layout-based board count.
Enter exposed face width in inches and board length in feet.
Subtract openings, add waste, set boards per pack, and enter price if needed.

Result	Meaning
Boards to buy	The higher of area-based and layout-based board count.
Packs	Boards rounded up by the pack size you enter.
Linear feet	Total board length purchased before cut optimization.
Coverage bought	Square footage covered by the full boards.
Fasteners	A rough planning count from board length and stud spacing.
Material cost	Boards, packs, or square footage multiplied by your price input.

This is a buying estimate, not a cut list. Manufacturer installation instructions control fastening, adhesive, acclimation, expansion gaps, fire rating, moisture limits, and indoor or exterior suitability.

Wall paneling formulas

The model calculates net area, applies waste, estimates boards by square footage, and also checks the visible row layout when wall dimensions are entered.

A_{net} = max (0, W \cdot H - A_{openings})

A net - net paneling area, W - wall width, H - wall height, A openings - doors and windows.

A_{order} = A_{net} \cdot (1 + \frac{r}{100})

A order - waste-adjusted area, A net - net area, r - waste percent.

B_{area} = ⌈ \frac{A _{order}}{F _{exposed} \cdot L _{board}} ⌉

B area - boards by area, F exposed - exposed face width in feet, L board - board length.

B_{layout} = ⌈ R \cdot K \cdot (1 + \frac{r}{100}) ⌉

B layout - layout boards, R - visible rows, K - boards per row, r - waste percent.

P = ⌈ \frac{B}{B _{pack}} ⌉

P - packs to buy, B - boards to buy, B pack - boards per pack.

Exposed face width and common profiles

Nominal board size is often larger than installed coverage. A 1x6 board, for example, may cover about 5.5 in or less depending on the profile and reveal. Use the product label or installation guide when available.

Profile	Starting exposed face	Notes
Shiplap	5.5 in	Common for nominal 1x6 interior shiplap.
Tongue-and-groove	5.25 in	Measure the visible face after the tongue enters the groove.
Beadboard plank	3.5 in	Narrow boards create more rows and more cuts.
Wide wall plank	7.25 in	Use for wider nickel-gap or decorative wall planks.

For panel sheets, such as 4 ft by 8 ft wall panels, use the known area mode or estimate panels separately by sheet coverage.

Waste, openings, and layout

Openings reduce square footage, but they do not eliminate all cuts around trim, outlets, returns, and corners. The calculator therefore keeps a separate waste allowance.

Project condition	Waste starting point
Simple rectangular accent wall	5-10%
Windows, doors, outlets, or many end cuts	10-15%
Pattern matching, diagonal work, or visible board selection	15-20%
First-time DIY installation	Add extra repair stock when practical

For wainscoting with stiles, rails, panels, caps, and base trim, use this calculator for plank or board coverage only and estimate the trim system separately.

What this estimate does not cover

The calculator does not create a board-by-board cut plan.
It does not check whether a product is rated for exterior walls, wet areas, ceilings, or fire-rated assemblies.
Furring strips, adhesive, caulk, primer, paint, trim caps, outlets, corners, and returns are outside the material count.
Actual fastener count depends on the product, studs, blocking, adhesive, and local installation requirements.
Sheet goods and decorative panel systems may need a panel layout rather than a plank calculator.

Treat manufacturer installation instructions as the final source for board coverage, acclimation, fastening pattern, adhesive, expansion gaps, and substrate preparation.

Frequently Asked Questions

Sources and References

Calculations are based on the listed reference sources. Links open in a new tab.

Updated: June 2, 2026

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