Calculate how much hardwood flooring to order. Hardwood typically uses a 15 percent waste allowance for cuts, defects, and grain matching.
Usage Tip
Order all the wood from one batch so color and grain match, and let it acclimate in the room for several days before installing.
linear feet = order × 12 ÷ board width
Linear feet estimates the total run of boards you will lay.
How Much Hardwood Flooring Do I Need?
Measure each room, add a waste factor for cuts, grading defects, and the install pattern, then divide by the carton coverage and round up to whole cartons. Buy a little extra from the same run, because matching a color lot later is difficult.
Cartons vs Square Feet
Hardwood is priced per square foot but sold in sealed cartons, each covering a fixed area (often about 18-24 sq ft, varying by board width). You buy whole cartons, so your true cost rounds up. Always confirm the carton coverage on the box and keep one spare carton for repairs.
| Plank width | Typical carton coverage |
|---|---|
| 2 1/4 in strip | about 18-20 sq ft |
| 3 1/4 in | about 20-22 sq ft |
| 5 in plank | about 22-24 sq ft |
| 7 in+ wide plank | about 22-26 sq ft |
Hardwood Flooring Waste Factor Guide
| Situation | Waste allowance |
|---|---|
| Simple rectangular room, straight lay | about 8-10% |
| Typical room, some angles | about 10-12% |
| Diagonal lay | about 15% |
| Herringbone / chevron | about 18-20%+ |
| Wide planks or low-grade (rustic) | add a few % more |
Solid hardwood usually wants 10% minimum; wide planks, busy patterns, and rooms with many cuts push it higher. The calculator bumps waste automatically with the pattern you pick.
Species Comparison
| Species | Hardness (Janka) | Notes |
|---|---|---|
| Red oak | 1290 | Classic, takes stain well, mid price |
| White oak | 1360 | Harder, water-resistant, on-trend |
| Maple | 1450 | Hard, light, subtle grain |
| Hickory | 1820 | Very hard, dramatic grain |
| Walnut | 1010 | Rich dark, softer, premium |
| Bamboo (strand) | 3000+ | Very hard, budget-friendly |
Nail-Down vs Glue-Down vs Floating
| Method | Best for | Needs |
|---|---|---|
| Nail / staple down | Solid 3/4 in over wood subfloor | Rosin/felt paper; cleats or staples |
| Glue down | Engineered or solid over concrete | Adhesive; moisture barrier on slab |
| Floating | Engineered click over any flat subfloor | Foam underlayment + vapor barrier |
Solid hardwood is nailed to a wood subfloor; over concrete you use engineered, glued or floated. The method drives whether you need underlayment, a vapor barrier, or adhesive – the calculator adjusts those line items to match.
Acclimation & Moisture Testing
Subfloor Prep & Expansion Gap
- Subfloor must be clean, dry, flat (about 3/16 in over 10 ft), and structurally sound – level low spots first.
- Over concrete, confirm it is fully cured and test for moisture; add a vapor barrier.
- Leave a 1/2 to 3/4 in expansion gap at all walls and fixed objects – cover it with baseboard and quarter-round.
- Stagger end joints at least 6 in and mix boards from several cartons for natural color blend.
- Dry-lay the first rows and plan the last-row width so you do not end on a sliver.
Frequently Asked Questions
How much hardwood flooring do I need?
Area times your waste factor, divided by carton coverage, rounded up to whole cartons. Enter the room, width, and pattern above.
How much waste should I add for hardwood?
At least 8-10% for a simple room, 15% for diagonal, and 18-20%+ for herringbone or chevron; add a little for wide or rustic-grade boards.
Why buy cartons instead of exact square feet?
Hardwood ships in sealed cartons covering a fixed area; you round up and keep a spare from the same lot for repairs.
Nail, glue, or float?
Nail solid wood over a wood subfloor; glue or float engineered over concrete. The method changes the underlayment, vapor barrier, and adhesive you need.
How long should hardwood acclimate?
At least 3-5 days in the installed room, sometimes 1-2 weeks – test moisture before installing.
How big an expansion gap?
About 1/2 to 3/4 in at every wall, hidden by baseboard and quarter-round, so the floor can move with the seasons.
Related Calculators
Note: hardwood estimates are approximations and vary by carton coverage, board width and grade, room shape, install pattern, and method. Always confirm carton coverage on the box, buy from one lot with a spare carton, acclimate and test moisture, and follow the manufacturer instructions. General DIY guidance, not a professional measure.