Sanding belts, discs, finish gallons and cost to refinish a hardwood floor.
Estimates are planning aids, not a professional quote. Double-check quantities and product coverage — and any local code or permit requirements — before you buy.
⚠ Sanding dust from a floor finished before 1978 can contain lead. Test an inconspicuous spot before sanding, and wear a properly rated respirator — not just a paper dust mask — for every pass.
⚠ Ventilate the room through the whole job and for several days after the last coat. Water-based finishes off-gas less than oil-based ones but still need airflow to cure hard.
⚠ Keep foot traffic off the floor for at least 24 hours after the final coat, and hold off on rugs and furniture for 1–2 weeks (longer for oil-based finish) while it fully cures — moving in too soon leaves permanent marks in a finish that's still soft underneath.
| Finishing & Sealant | $167–$227 |
| Fasteners & Hardware | $15–$21 |
| Total | $183–$247 |
Excludes tools, delivery, tax and permit fees. Labor not included — this is a DIY materials estimate.
These are affiliate links: we may earn a commission if you buy through them, at no extra cost to you. It never changes what the calculator recommends — the shopping list comes from your dimensions, not from what pays.
About this calculator
Enter your floor's square footage and its current condition, and the Hardwood Refinishing Calculator works out the full sanding progression it needs — drum sander belts, edger discs and final buffer screens — broken out by grit stage. A floor with a few surface scuffs needs a very different abrasive count than one with deep gouges or cupped boards, so the condition you choose drives how many cuts the machines have to make before the wood is ready for a fresh finish.
Choose water-based polyurethane, oil-based polyurethane or a hardwax oil, set how many coats you're applying, and add a stain coat or stairs if the job calls for either. The calculator sizes gallons to that finish's real spread rate rather than a single flat number, adds hand-sanding sheets for treads and risers a drum sander can't reach, and flags the extra cure time an oil-based finish demands before furniture goes back.
Step by step
A step-by-step walkthrough to go with your plan above. Follow the product instructions and any local code or permit requirements as you work.
Empty the room completely, remove floor vents and door stops, and if the existing finish predates 1978, test it for lead before you disturb any dust. Pull up any trim or tack strip you don't want sanded through.
Set popped nails, screw down squeaky boards, and work wood filler into open gaps and nail holes so the coarse cut doesn't just widen them further. Let the filler cure fully before sanding starts.
Run the drum sander with the grain at the grit your floor's condition calls for, overlapping each pass by about a third and never letting it sit still while spinning. Follow immediately with the edger at the same grit around the perimeter.
Repeat with the drum sander and edger at each progressively finer grit, vacuuming thoroughly between passes so leftover coarse grit doesn't scratch the next stage. Hand-sand the stairs and any tight corners the machines can't reach at each grit too.
Run the floor buffer with a fine mesh screen to knock down sanding marks and open the grain evenly, then vacuum and wipe the whole floor with tack cloths until it's genuinely dust-free.
Work the stain in small sections with the grain, wiping off the excess before it dries so the color goes on even. Let it dry fully per the can's instructions before any finish touches it.
Cut in the edges with a brush, then lay off each coat with a lambswool or T-bar applicator in long, even strokes with the grain. Lightly screen and tack between coats for the best adhesion.
Stay off the floor for the first 24 hours, then socks only, and hold furniture, rugs and pads off it until the finish fully cures — oil-based finish needs noticeably longer than water-based.
Equip the job
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Interior & Finishing
Answers
It depends on how many grits the job needs. A standard 3-cut refinish — coarse, medium, then fine — on a worn floor typically runs several drum sander belts and a handful of edger discs per few hundred square feet, plus a couple of buffer screens for the final pass before finish. A floor with deep gouges or cupping adds an extra-coarse pass first and can roughly double the belt count, while a floor that only needs a light screen-and-recoat skips the drum sander entirely. Enter your area and condition and the calculator totals the exact count for each grit stage.
A screen-and-recoat only lightly abrades the existing finish with a floor buffer and a fine mesh screen, then applies fresh topcoats — it doesn't touch bare wood and can't fix color, stains or gouges, but it's fast and cheap. A full refinish runs a drum sander and edger through progressively finer grits down to bare wood, removing the old finish along with scratches, stains and unevenness, before stain and finish go back on. Pick screen-and-recoat for a floor that's just lost its shine; pick a full refinish once you can see wear through the topcoat or the color's uneven.
Most water-based polyurethanes are dry enough for careful sock-footed traffic in about 24 hours and fully cured in around 2 weeks; oil-based polyurethane takes longer at both ends, often 24–48 hours before light traffic and 3–4 weeks to fully harden. Hold off on rugs, furniture pads and heavy foot traffic until the finish has cured, not just dried to the touch — a finish that feels solid can still be soft enough to dent or haze under a rug for days after you can walk on it normally.
Water-based poly dries fast, has low odor, and stays close to the wood's natural color, which suits busy households and lighter wood species. Oil-based poly ambers noticeably over time, which many people like on red oak and darker stains, and it's more forgiving to apply by hand, but it off-gases strongly and needs real ventilation — plus the used rags are a genuine fire hazard if balled up while wet. Either needs more coats at a thinner spread than most people expect; this calculator sizes gallons to your chosen finish's actual coverage rate.
No — a drum sander and edger are both too large and too aggressive for stair treads and risers, so stairs are hand-sanded or worked with a random-orbital sander through the same grit progression as the field. That makes them slower per square foot and consumes sandpaper as individual sheets rather than machine belts. Toggle stairs on and enter the step count and the calculator adds a hand-sanding sheet allowance and extra labor hours on top of the room takeoff.