Vinyl Plank Flooring Calculator

Calculate how many vinyl plank boards and boxes you need for a room from the plank size and planks per box, with 10% waste and an optional cost estimate.

By CalcBuilt Editorial TeamUpdated September 9, 2026Formulas checked against manufacturer specs, see how we calculate.

Quick answer: To find how many vinyl planks you need, multiply room length by width, add 10% for waste, and divide by the area of one plank (width x length in inches / 144), then divide by the planks per box. A 12 x 10 ft room needs 132 sq ft including waste, which is 57 planks of 7 x 48 in, or 6 boxes of 10 planks.

Results

Vinyl plank to buy: 132 sq ft; 120 sq ft floor area plus 10% waste
Planks needed: 57 planks; 7 in x 48 in planks, 2.33 sq ft each
Boxes to buy: 6 boxes; Each box covers 23.3 sq ft; 60 planks or 140 sq ft purchased
Floor area: 120 sq ft; 13.33 sq yd

Vinyl Plank Flooring formula

Floor area (sq ft) = Length (ft) x Width (ft) + closets and hallways
Plank area (sq ft) = Plank width (in) x Plank length (in) / 144
Planks = Floor area x (1 + waste %) / Plank area, rounded up
Boxes = Planks / planks per box, rounded up

Worked example

A 16 x 13 ft family room with a 12 sq ft closet: 208 + 12 = 220 sq ft. Add 10% waste for 242 sq ft. With 6 x 36 in planks, each plank is 6 x 36 / 144 = 1.5 sq ft, so 242 / 1.5 = 161.3, or 162 planks.

At 8 planks per box that is 162 / 8 = 20.25, so buy 21 boxes, which is 168 planks or 252 sq ft. At $45 per box the flooring costs $945.

Quick reference

Planks per 100 sq ft by plank size (including 10% waste)
Plank size	Area per plank	Planks per 100 sq ft
6 x 36 in	1.50 sq ft	74
6 x 48 in	2.00 sq ft	55
7 x 48 in	2.33 sq ft	48
7.5 x 48 in	2.50 sq ft	44
9 x 48 in	3.00 sq ft	37
9 x 60 in	3.75 sq ft	30
12 x 24 in tile	2.00 sq ft	55

How to calculate vinyl plank flooring

Measure the room length and width in feet and multiply for square footage, then add closets and hallways. Waste is row ends: the cutoff from one row starts the next only if it is 8 inches or longer, and end joints stagger at least 6 inches. Figure 10 percent for a rectangular room, 15 for diagonal, herringbone or 60 inch planks. Divide by the area of one plank to get a plank count, then by the planks per box, rounding up each time.

Box coverage is printed on the label and ranges from about 20 to 30 square feet, so two products with the same plank size can pack differently. Order every box at once from one lot number and check the run number on each carton at pickup, since color and embossing shift between runs. Keep a full box for repairs.

Choosing and installing vinyl plank

Look at the wear layer, not just the total thickness: 12 mil handles most homes, 20 mil or more stands up to dogs, kids and entryways. Rigid core (SPC or WPC) bridges small dips better than flexible glue-down vinyl, but a 4 to 5 mm plank still telegraphs every ridge, nail head and grout line. Most makers want the subfloor flat to 3/16 inch in 10 feet: grind the highs and fill lows with cement floor patch. On a slab, run a moisture test first (ASTM F2170 probe or a calcium chloride kit). The planks are waterproof, the warranty is not, and mold grows under a floating floor on a wet slab.

Click-lock planks float, so leave a 1/4 inch gap at every wall, cabinet, pipe and door jamb. Undercut jambs and casings with a jamb saw so the plank slides under, and cover the wall gap with quarter round or shoe. Runs past 40 to 50 feet and every doorway get a T-molding. Use only the underlayment the maker approves, and none at all over an attached pad; a soft pad lets joints flex and separate.

What this calculator leaves out

Planks only. Not included: quarter round or shoe molding for the perimeter (the baseboard calculator gives that length), T-moldings and reducers at doorways, and stair nosings. Also left out: underlayment if the plank has no attached pad, floor patch or self-leveler, a slab moisture test, a jamb saw rental, and hauling off the old floor. Toe kicks that were installed over the old floor usually have to come off and go back on.

Mistakes that cost money

Subfloor more than 3/16 in out of flat in 10 ft telegraphs through rigid core and pops click joints; grind highs and patch lows first.
Floating LVP on a slab with no moisture test: makers set a limit, typically 80 to 85% RH (ASTM F2170), and deny claims above it.
Two lot numbers show a color and gloss shift at the seam; order it all at once and check every carton at pickup.
Pinning a floating floor under a kitchen island or vanity locks it in place and it buckles in summer; set cabinets first, floor around them.
A pad under planks that already have an attached pad doubles the cushion and the joints separate; use only the underlayment the maker approves.
Runs past 40 to 50 ft or through a doorway need a T-molding; instruction sheets cap run length and skipping it voids the warranty.

Key facts

A 7 x 48 in plank covers 2.33 sq ft, so a box of 10 covers 23.3 sq ft; a 6 x 36 in plank covers 1.5 sq ft.
Wear layer thickness drives durability: 12 mil is typical for residential use, 20 mil or more for heavy traffic and light commercial floors.
Rigid core (SPC and WPC) planks are 4 to 8 mm thick and float over the subfloor with a 1/4 in expansion gap at the walls.
A typical box of luxury vinyl plank covers 20 to 30 sq ft.
Acclimate boxes in the room for 48 hours and install between 65 and 85 F for click-lock planks.

Frequently asked questions

How many boxes of vinyl plank flooring do I need for a 12x12 room?

144 square feet plus 10% waste is 158 square feet. With 7 x 48 in planks (2.33 sq ft each) that is 68 planks, or 7 boxes of 10 planks.

How much waste should I add for vinyl plank?

10% for a straight layout in a rectangular room. Use 15% for diagonal or herringbone patterns, rooms with many alcoves, or planks longer than 60 inches.

Can I install vinyl plank over existing tile or hardwood?

Over tile, yes if the floor is flat: skim grout lines wider than 1/4 inch with floor patch, or a thin plank shows every joint within a year. Over solid hardwood, yes if the boards are tight and sanded flat; run the new planks across the old boards. Never float over carpet or cushioned sheet vinyl, and check that the added height clears doors and appliances.

Does vinyl plank need underlayment?

Only if the manufacturer requires it. Many rigid core planks have an attached pad and go directly over a flat subfloor. Glue-down vinyl never gets a pad.

Sources and references

Vinyl flooring installation guide (Shaw Floors)
Resilient flooring resources and Recommended Work Practices (Resilient Floor Covering Institute)
How to install laminate and vinyl flooring (Pergo)

Next steps for this project

The usual order for a flooring & tile project. See all flooring & tile calculators.

Results are estimates based on standard formulas and typical product specifications. Confirm quantities with your supplier and local code before ordering.