How Many Boxes of Laminate for Stairs (or Vinyl Plank)?

By the HandyFigures team · Updated 2026-06-15

The first time I floored a staircase, I bought for the square footage and was a full box short by the seventh tread. A 13-step flight tapes out to about 62 square feet of actual surface, which sounds like a box and a half of laminate — and that’s wrong by more than half, because stairs are the single wastiest cut job in the house. The honest number for that flight is four boxes, and the gap between “62 square feet” and “four boxes” is exactly why people run out mid-climb. Once you see where the square footage goes, the four stops feeling like a ripoff.

Square footage per step: tread plus riser

A staircase isn’t a floor, it’s a stack of small L-shaped surfaces, and you cover two faces per step. The tread is the part you walk on; the riser is the vertical face your toe meets on the way up. Standard residential geometry runs a tread depth of 10 to 11 inches across a 36-inch width, and a riser roughly 7.5 inches tall by that same 36 wide.

• Tread: 10.5 in × 36 in = 378 sq in ÷ 144 = 2.6 sq ft (I’ll use 2.5–2.7 as the real-world band)
• Riser: 7.5 in × 36 in = 270 sq in ÷ 144 = 1.9 sq ft (call it ~2.0)

Add them and you get roughly 4.5 to 5 square feet of laminate per step. I’ll carry 4.7 square feet as a working figure for a 36-inch flight. That already tells you stairs are deceptive: a flight with a tiny footprint on the floor plan eats nearly as much plank as a small bedroom.

One thing to settle before you cut: whether you’re cladding the risers at all. Some installs leave risers painted and laminate only the treads, halving the per-step figure to about 2.6 square feet. Decide that first — everything below assumes treads and risers wrapped.

The full worked flight: 13 treads, 14 risers

A “13-step” flight usually means 13 treads and 14 risers — the top riser sits under the landing, so risers run one ahead of treads. Here’s the raw surface:

• 13 treads × 2.6 sq ft = 33.8 sq ft
• 14 risers × 2.0 sq ft = 28.0 sq ft
• Raw surface: 61.8 sq ft — round to ~62 sq ft

Buy 62 square feet of laminate, grab four boxes, and you’d think you had margin. You wouldn’t. Now apply real stair waste:

62 sq ft × 1.33 = 82.5 sq ft → ~83 sq ft to buy

At 20 square feet per box, 83 ÷ 20 = 4.15, which rounds to 5 boxes taken literally — but the 33 percent already bakes in generous cushion, and most installers land this flight at 4 boxes (80 sq ft) by reusing each riser’s offcut on the next riser. Four is the number I’ve hit on flights this size; five is the safe call if your treads run wider than 36 inches or it’s your first stairway. Either way, the lesson is the multiplier, not the rounding: 62 square feet of stairs needed 80+ square feet of plank.

Why stairs eat 30–35% waste, not the floor’s 10%

On a flat floor I add 10 percent for a straight layout and I’ve explained where that goes in our flooring waste percentages guide. Stairs are a different animal, and 10 percent will leave you stranded. Three reasons it climbs to 30–35:

Every piece is a cut piece. On a floor, the middle of the room is full planks laid end to end — zero waste in the field. A staircase has no field. Every tread and every riser is trimmed to width and length, so there’s no “free” full-plank area to dilute the cutting losses.

Tread depth wastes plank width. Most planks are 6 to 7.5 inches wide and a tread is ~10.5 inches deep, so you cover each tread with one full plank plus a ripped strip. That rip leaves a narrow offcut that rarely fits anywhere else. Multiply by 13 treads.

Width forces a seam or a big offcut. A 36-inch tread against a 48-inch plank leaves a 12-inch cutoff per tread that’s usually too short to reuse. Across a flight, those stubs pile up fast.

Add the usual defect culls and a mistake or two, and 30–35 percent isn’t padding — it’s the floor of what stairs consume. I’ve seen tight, wide-tread flights push past 40.

Boxes by flight size: laminate vs. LVP

Coverage per box is the other lever, and vinyl plank (LVP) typically ships in bigger cartons — often 24 to 30 square feet versus laminate’s ~20 — so the same staircase can need fewer LVP boxes. All figures below use 4.7 square feet per step and a 33 percent stair waste factor, rounded up to whole boxes.

*The 13-step laminate row rounds to 5 on paper but lands at 4 in practice, as worked above — it sits 2 square feet over four boxes, exactly the kind of sliver the waste cushion usually absorbs. If your treads are a true 36 inches and you cut carefully, buy four; if anything about the flight is irregular, buy five and keep the spare.

Notice the pattern: moving from 20-square-foot laminate boxes to 30-square-foot LVP boxes saves a box or two on bigger flights — the same way box coverage swings a room count in our companion walkthrough on how many boxes of laminate a room takes. Flip your own carton over and use its number; the table is a starting point, not gospel.

Stair nose is sold separately — don’t count it in your boxes

Here’s the trap that wrecks first-timer budgets. The rounded front lip of each tread — the bullnose — isn’t cut from a plank in the box. It’s a dedicated stair-nose molding that color-matches your floor, sold by the linear foot in pieces around 78 inches — about one piece per tread on a 36-inch stair.

For a 13-tread flight at 36 inches wide, that’s roughly 13 pieces of stair nose at $15 to $40 each depending on the line — call it $200–500 (13 × $15 ≈ $195, 13 × $40 ≈ $520) on top of your four boxes of plank, and none of it reduces your box count. Budget it as a separate line item, confirm the molding comes in your exact decor before you commit, and order it with the planks — stair nose gets discontinued just like they do.

Buy one extra box, same dye lot

I close every flooring guide the same way because it’s the cheapest insurance in the trades. Order one box beyond your count, off the same dye lot — laminate and LVP shade-vary between runs, and a stair tread sits at eye level where an off-shade plank screams. The spare earns its keep twice on stairs: treads take the most abuse in the house, so a cracked tread five years out needs a perfect-match replacement that won’t be on any shelf by then.

The whole stair formula in one breath: steps × ~4.7 square feet, times 1.33 for waste, divided by your real box coverage, rounded up — then add stair nose by the linear foot and one spare box. If you’d rather not do that long division on a stepladder, run your flight through the flooring calculator, set the waste factor high for stairs, and let it handle the rounding.

These are planning estimates from typical residential stair dimensions; your treads, riser heights, and box coverage decide the real count, so measure your own flight and read your own carton. A staircase has zero margin — no field of full planks to hide a short order — so when the math lands between two box counts, buy up.