Understanding your result
The headline is the boxes to buy, with the floor area, the finish and the adhesive beside it. The table gives the format, the waste, the boxes and the cork bought, the finish for the number of coats you entered, the contact adhesive for glue-down cork, and the underlayment rolls for a floating floor.
Boxes follow the usual chain: floor area plus waste, divided by the box coverage, rounded up. Finish is the floor area divided by the coverage per coat, times the coats. Cork is porous, and the joints between tiles are where water gets in, so the coat count matters more than the brand; the note warns when you enter fewer than three for a glue-down floor.
The contact adhesive is for glue-down tiles only and includes 10% for the trowel and the can. The underlayment is for floating planks, at 5% over the area in 100 sq ft rolls; many cork planks have a cork underlay already attached, in which case skip it. The more detailed counts for each are on the underlayment calculator, and the floating-floor rules on the laminate calculator apply to cork planks too. For a waterproof alternative in a wet room, the vinyl plank calculator is the comparison.
How we calculate this
Coverage figures are typed as printed on the can, in square feet per gallon or square metres per litre. The waste figures are the layout allowances on the waste factors reference. The underlayment guide explains why a floating cork floor needs only a thin underlayment, and the guide to wood and laminate floors covers the floating-floor rules cork planks share with laminate.
The assumptions behind the numbers
| Assumption | Default | Where it comes from |
|---|---|---|
| Box coverage | 22.5 sq ft (2.1 m²) | Typical floating cork plank boxes (21 to 23 sq ft); glue-down tile boxes vary from 20 to 33 sq ft (manufacturer product pages, 2025) |
| Finish | water-based polyurethane, 425 sq ft per gallon per coat | Cork floor finish data sheets: 400 to 450 sq ft per gallon |
| Coats | 1 (prefinished), 3+ (unfinished glue-down) | Cork manufacturers’ installation instructions |
| Contact adhesive | 175 sq ft per gallon, both faces | Cork contact cement data sheets: 150 to 200 sq ft per gallon |
| Underlayment | 100 sq ft rolls, 5% allowance | Thin foam or cork underlay for floating floors |
Assumptions last reviewed October 8, 2026.
The calculator does not judge whether the subfloor is fit for cork; glue-down cork needs a flat, dry, clean substrate, and concrete must be tested for moisture. It does not count the edge sealant some makers use around the perimeter of a bathroom, the transitions, or the roller used to press glue-down tiles. It assumes one cork product over the whole floor.
Two worked examples
A 16 × 12 ft family room in floating cork planks
22.5 sq ft boxes at $95, one coat of finish to seal the joints, straight layout.
- Floor area: 192 sq ft; with 10%: 211 sq ft
- Boxes: 211 ÷ 22.5 = 9.4, rounded up to 10 boxes (225 sq ft), $950
- Finish: 192 ÷ 425 × 1 coat = 0.45 gallon
- Underlayment: 192 × 1.05 ÷ 100 = 2.0, rounded up to 3 rolls
Ten boxes, a half gallon of finish and three rolls, unless the planks come with a cork underlay attached, in which case the rolls are not needed. The finish coat is optional on many prefinished planks but makes a family room easier to mop.
A 90 sq ft bathroom in glue-down cork tiles
21 sq ft boxes, unfinished tiles, three coats of finish, contact adhesive at 175 sq ft per gallon.
- Area to order: 90 × 1.10 = 99 sq ft
- Boxes: 99 ÷ 21 = 4.7, rounded up to 5 boxes
- Finish: 90 ÷ 425 × 3 = 0.64 gallon; adhesive 90 ÷ 175 × 1.1 = 0.57 gallon
A gallon of each is the practical buy. The three coats are what make cork work in a bathroom; each coat needs to dry before the next, so the floor is out of use for two or three days.
Where to find your inputs
Format. On the product page: “floating”, “click” or “glueless” planks, against “glue-down” or “tile”.
Coverage per box. On the box label in square feet or square metres.
Finish coats. From the maker’s instructions; unfinished tiles need the most.
Finish and adhesive coverage. On the can’s data sheet.
Common mistakes
- Too few coats on glue-down cork. The joints let water in. Three coats minimum on unfinished tile.
- Floating cork in a bathroom. The core swells. Use glue-down cork or vinyl in wet rooms.
- No expansion gap on floating cork. It is built like laminate and moves like it.
- Contact cement on one face only. Contact adhesive bonds only when both faces are coated and left to tack up.
- Heavy furniture without pads. Cork dents under narrow legs. Felt pads and wider glides help.
- Direct sun with no protection. Cork changes colour; rugs and blinds keep it even.
Questions people ask
- How many boxes of cork flooring for 200 square feet?
- With 10% waste, 220 sq ft. Floating cork planks come about 21 to 23 sq ft per box, so 10 boxes at 22.5 sq ft; glue-down tiles 20 to 33 sq ft per box depending on size. The label decides.
- How many coats of finish does cork need?
- Unfinished glue-down cork needs at least three coats of water-based polyurethane on site, and many makers say four in kitchens. Prefinished glue-down tiles usually get one coat after installation to seal the joints. Prefinished floating planks often need none, or one if the maker recommends it.
- How much contact adhesive does cork need?
- Cork contact cement is applied to both the floor and the back of the tile, and covers about 150 to 200 sq ft per gallon counting both faces. A 90 sq ft bathroom needs a little over half a gallon including the allowance.
- Is cork flooring good in a kitchen or bathroom?
- Glue-down cork, properly sealed with several coats, is used in kitchens and bathrooms and is warm and soft underfoot. Floating cork planks have a fibreboard core like laminate and should be kept out of wet areas. In either case the finish is what keeps water out.
- Does cork fade?
- Yes, cork lightens or darkens in strong sunlight, and furniture can leave shadows when moved. Rugs, blinds in the sunniest rooms and rotating furniture keep the colour even. Felt pads prevent dents from narrow chair legs.
- Do floating cork floors need an expansion gap?
- Yes, the same as laminate, usually 3/8 inch at every wall, and a transition strip on long runs. Glue-down cork is bonded and needs only a small gap at the walls.