Flooring Square Footage Calculator
New floors get priced by the square foot, but you never order the exact square footage you measure. Cuts, defects, and future repairs mean you buy a margin on top. This calculator adds up each room, applies a waste factor that matches your material, and tells you how many cartons to buy so you finish the job on one order.
Measure each room, then add them up
Flooring almost never covers a single clean rectangle. You've got a living room, a hall, maybe two bedrooms, and closets that all get the same product. Measure each space separately, length times width in feet, then total them.
A 14 by 16 living room is 224 square feet. A 10 by 12 bedroom is 120. A 3 by 8 hallway is 24. Add those and you're at 368 square feet before waste. For any room that isn't a simple rectangle, split it into rectangles, calculate each piece, and sum them. Our pillar guide on calculating square footage covers that method, and the room square footage calculator handles a single space at a time.
Don't forget closets. A reach-in closet is easy to skip and it's real square footage that eats planks. Measure the closet floor and add it to the room it opens into. Transitions between rooms and thresholds at doorways also consume material, so measure into the doorway opening, not just to the wall.
Add a waste factor by material
The waste factor is the extra you buy to cover cut-offs, the boards you cull for defects, and the attic stock you keep for repairs. How much depends on the material and the layout.
- Carpet: 5 to 10 percent. Carpet comes on wide rolls, and seaming layout drives waste more than cuts do.
- Laminate: 5 to 10 percent. Bestlaminate and most manufacturers put the laminate waste factor at 5 to 10 percent of your total area for a standard straight install.
- Vinyl plank (LVP): 5 to 10 percent. Similar to laminate. Click-together planks let you use the cut end of one row to start the next.
- Hardwood: 5 to 10 percent for good material on a straight layout, more for lower grades. Cheaper bundles carry more knots and short boards you'll cull, which can push effective waste to 15 percent or higher.
- Tile: 10 percent standard, 15 to 20 percent for diagonal or herringbone. Tile cuts don't reuse the way plank offcuts do. See the tile square footage calculator for the pattern-by-pattern breakdown.
Why hardwood and diagonal layouts need more
With plank flooring run straight, the piece you cut off the end of one row becomes the starter for the next row. That reuse keeps waste low. Turn the layout 45 degrees and that stops working, because the angled offcuts don't line up to start the next run, so diagonal installs typically need 15 percent instead of 10.
Hardwood adds a second variable: grade. In a Fine Homebuilding forum thread on how much extra hardwood to order, experienced builders shoot for 7 to 10 percent on quality material laid straight, and note that offcuts becoming starters keeps real waste low, sometimes down to 4 percent. The same thread flags the flip side. When one poster's supplier quoted 720 square feet to cover 585 (a 23 percent bump), the forum called it excessive, likely a sales tactic rather than a real need. Lower-grade wood with more defects genuinely needs more culling, but a straight run of clean material does not need 20-plus percent.
Carpet is often sold by the square yard
Here's the trap that throws people off. Carpet, and some vinyl and commercial goods, gets priced and sold by the square yard, not the square foot. A square yard is a 3 by 3 patch, which is 9 square feet. To convert, divide your square footage by 9.
That 368 square foot job is 368 / 9, or about 41 square yards. If carpet is quoted at $30 per square yard, that's 41 x $30, roughly $1,230 for material, before pad and labor. Watch the units on the quote, because $4 per square foot and $36 per square yard are the same price, and mixing them up throws your budget off by a factor of nine.
Buy by the carton or roll
Hard flooring ships in cartons, and each carton covers a fixed amount. A box of LVP might cover 23.6 square feet. A carton of hardwood might cover 20 square feet. You can't buy a partial carton, so divide your total (with waste) by the carton coverage and round up.
Carpet is different. It comes off a roll in a fixed width, usually 12 feet, sometimes 15. Because you're cutting from a fixed-width roll, the installer plans seams to minimize waste, and the yardage they order can exceed your room math depending on how the pieces fall. That's normal, and it's why carpet estimates often come from the installer rather than a simple area calculation.
Worked example: two rooms and a hall
You're putting waterproof vinyl plank across a living room, a bedroom, and the hall connecting them.
- Living room: 14 ft x 16 ft = 224 sq ft.
- Bedroom: 10 ft x 12 ft = 120 sq ft.
- Hall: 3 ft x 8 ft = 24 sq ft.
- Bedroom closet: 3 ft x 5 ft = 15 sq ft.
- Total area: 224 + 120 + 24 + 15 = 383 sq ft.
- Add 10 percent waste: 383 x 1.10 = 421.3 sq ft.
- Convert to cartons: if each carton covers 23.6 sq ft, 421.3 / 23.6 = 17.85, round up to 18 cartons.
Eighteen cartons cover the job with enough left over to replace a plank if you gouge one moving furniture back in. Label the spares and keep them dry and flat.
Common mistakes
Ordering exactly what you measured. Zero waste means the first mis-cut sends you back to the store, and by then the run or dye lot may be gone. Always add the material's waste factor.
Mixing square feet and square yards. Assume every quote is per square foot and you'll badly underestimate a carpet job priced per yard. Check the unit, and divide by 9 when you need to convert.
Skipping closets and transitions. They're small individually but they add up across a house, and they're the pieces people forget until the installer runs short.
Over-ordering low-quality hardwood based on a sales quote. A 20-plus percent overage on clean, straight material is usually a markup, not a real requirement. Match the waste factor to the grade and layout.
Frequently asked questions
How do I calculate square footage for flooring?
Measure each room's length and width in feet, multiply for each room's area, and add all the rooms, halls, and closets together. Then add a waste factor for your material, usually 10 percent. Round the final number up to whole cartons when you order.
How much flooring do I need?
Take your total measured square footage and add the waste factor for the material, then divide by the coverage listed on each carton and round up. For a 383 square foot job in vinyl plank at 10 percent waste, that's about 421 square feet, or 18 cartons if each covers 23.6 square feet.
How much extra flooring should I buy?
Plan on 5 to 10 percent for carpet, laminate, vinyl plank, and quality straight-laid hardwood, and 15 percent or more for diagonal layouts or lower-grade hardwood with defects. Tile runs 10 percent straight and 15 to 20 percent for diagonal or herringbone. Keep the leftovers as repair stock.
Why does carpet get sold by the square yard?
Carpet comes off wide rolls and the trade has historically priced it per square yard. One square yard equals 9 square feet, so divide your square footage by 9 to convert. Always confirm whether a quote is per square foot or per square yard before you compare prices.
Do I need to measure closets and doorways?
Yes. Closet floors take the same flooring and are easy to forget, and doorways and transitions consume material where rooms meet. Measure into the doorway opening and include every closet that gets the new floor, or you'll come up short.
Related tools
Pricing a tile job instead? Use the tile square footage calculator. To turn area into board or plank runs, the square feet to linear feet converter does the math.
For any other shape or a whole project at once, start from the main square footage calculator.