Square feet is the measurement; boxes are the purchase.
By David Liu, founder of DIY9lives. Last updated November 2, 2026.
Flooring is bought in boxes that cover a stated area, so the ordering question is one division away from the measuring question. The interesting part is the waste factor, because that number has to absorb every cut you will make and every plank you will reject. This guide works a two-room job through the same steps as the flooring calculator.
Length times width for each room, in feet, and add them. A 12 by 14 room is 168 square feet; a 10 by 10 room is 100. Together, 268 square feet.
Then add the parts that are easy to forget: closets, doorways between rooms, the alcove behind a door, and any area where the old flooring is coming up. A closet 2 by 4 feet is 8 square feet, and a hallway is usually more than it looks. Measure the plan, not your memory of the room.
Subtract nothing for the kitchen island or a fireplace hearth unless you are cutting around it, and even then the offcut is waste rather than savings. For a first estimate, treat every square foot of floor as floor.
Waste covers offcuts at the walls, boards damaged in transit, and the piece that has a bad factory edge. It is not optional, and the percentage depends on the layout:
| Job | Waste | On 268 sq ft |
|---|---|---|
| One simple rectangular room | 5% | 281 sq ft |
| Two rooms, standard plank layout | 10% | 295 sq ft |
| Diagonal, herringbone or many doorways | 15–20% | 308–322 sq ft |
Diagonal layouts waste the most because every boundary cut is at an angle and offcuts rarely fit anywhere else. A room with a lot of jogs, a chimney breast or a curved bay is closer to the diagonal case than the rectangular one, even with a straight lay.
Keep the leftover boxes. A few spare boards are what let you replace a damaged plank in three years without hunting for a discontinued colour. Two or three boxes flat, in a dry place, is enough.
Divide the area you need by the coverage on the box, then round up. At 20 square feet per box, 295 square feet is 14.75 boxes, so 15 boxes, which is 300 square feet. At $3.50 a square foot that is about $1,050 in material.
Check the box's stated coverage rather than assuming. Laminate and vinyl plank boxes commonly cover between 18 and 24 square feet; hardwood can be under 20; tile is sold by the box with a square-foot figure that varies by tile size. The number is printed on the carton, and it is the only one that matters at the till.
For tile, add the same waste and then add grout and a small allowance for breakage on cuts. For carpet, the calculation is different again: carpet is sold by the square yard and comes in fixed widths, so the installer measures and the waste is built into the roll layout rather than into a percentage.
Most wood, laminate and vinyl plank products want to sit in the room, in the boxes, at normal living temperature before installation. The manufacturer's instruction sheet states the time and the conditions, and it is usually 48 to 72 hours. Skipping it is the most common cause of gaps opening after the first heating season.
Measure the width of the room and divide by the plank width to see what the last row will be. If it comes out under about a third of a plank, shift the first row to split the difference rather than leaving a sliver at one wall. Do that arithmetic before you cut anything.
Floating floors need a gap at every wall, hidden by baseboard or shoe moulding. Leave the gap the manufacturer specifies; a floor installed tight to the wall can buckle in humid weather. Baseboard removal and refitting is a real cost in time, and new shoe moulding is often the simpler route.
Underlayment, if the product needs it, is a separate line and can be a meaningful fraction of the material cost. Adhesive, transition strips, thresholds, stair nosings and a new blade for the saw are all small items that add up. If you are paying for installation, that is usually quoted per square foot and often at a different rate for stairs, which are counted by tread rather than by area.
Delivery is the last one. Fifteen boxes of laminate is heavy, and a delivery charge is cheaper than the physiotherapy. If you are collecting, check the vehicle's load rating before you commit to a full pallet.
For the two rooms above: 268 square feet measured, 295 with 10% waste, 15 boxes at 20 square feet each, roughly $1,050 before underlayment and trim. Stepping the waste to 15% adds one more box. Measure twice, order once, and keep the spares.
The square footage does not change with the material, but the waste factor and the preparation do. Carpet is the outlier: it is sold by the square yard and comes in fixed widths, so the installer lays out the roll and the waste is whatever the layout produces. A room that is 13 feet wide in a 12 foot carpet is two lengths with a 1 foot strip cut off, which is far more waste than 10%.
Solid hardwood wants a stable humidity range and cannot go below grade. Engineered wood tolerates more movement and can go over concrete. Laminate and vinyl plank float, which means they need an expansion gap and a flat subfloor; a 3 mm dip over 6 feet is enough to make a floating floor click and bounce. Tile needs a stiff subfloor and a flat one, and its waste factor is higher because every cut edge has to land on a grout line.
Bathrooms and laundry rooms narrow the list. Whatever goes in needs to survive a spill, which argues against laminate and for tile, vinyl or engineered products rated for wet areas. Kitchens are the same question with more traffic.
The order of operations is worth planning before the boxes arrive: old floor up, subfloor checked and levelled, underlayment down, flooring laid, then trim. Every one of those steps is easier with the material already in the room, acclimating, rather than arriving on the day.
A floating floor needs a tapping block, a pull bar, spacers, a saw and a straight edge. That list costs less than a box of flooring and makes the difference between a clean job and a bruised one. A mitre saw is not essential but is much faster than a jigsaw for crosscuts, and a fine-tooth blade matters for laminate because a coarse blade chips the wear layer.
Time is the part people underestimate. A confident DIYer lays roughly 200 to 300 square feet of click flooring in a day, including underlayment and trim, in a room without complicated jogs. Two rooms with three doorways, a closet and a radiator to cut around takes longer, and the first room always takes twice as long as the second.
Order the material a week before you start, so it can acclimate and so a damaged box can be exchanged without holding up the job.
Last updated: November 2, 2026. Estimates only. Not tax, legal, financial, or professional advice. See the terms.