Flooring Calculator

Boxes of laminate, vinyl plank or hardwood plus underlayment.

Flooring boxes

10 boxes

Floor area

168 sq ft

Coverage needed

185 sq ftincludes 10% waste

Coverage purchased

200 sq ft10 whole boxes; 15.2 sq ft beyond allowance

Boxes

10 boxes~20 sq ft per box (check yours)

Underlayment

2 rolls100 sq ft foam rolls; check product requirements

Flooring cost (est.)

$450$2.25/sq ft × 200 sq ft purchased

How this estimate works

Room area × (1 + waste % ÷ 100) gives coverage needed. Divide by box coverage and round up to whole boxes. Cost uses whole boxes × box coverage × your price per sq ft. Start at 10% waste for a simple layout; complex cuts may need more.

Optional underlayment rounds up to 100-sq-ft rolls at a sample $35 per roll. Turn it off for attached-pad products or when separate foam is not permitted. Trim, transitions, adhesives, removal, and subfloor repairs are not included; edit supplier prices in My Projects.

Planning estimate. Adjust allowances and sample prices for your supplier; tax, delivery, and labor are not included.

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Click-together laminate and luxury vinyl plank are the most DIY-friendly floors there is — no nails, no glue, just a flat subfloor and a little patience. A floating floor over good underlayment goes down fast and looks pro if you nail the prep.

DifficultyIntermediate

TimeA weekend for an average room

SkillsComfortable measuring and making clean cuts; easy on the knees with pads

Measuring a room — multiply length × width for each rectangle, break odd shapes (closets, bays) into separate rectangles and add them, then add 5–10% for cuts and waste.

Tools you'll need

Tapping block, pull bar, and spacers
Utility knife or miter/jamb saw
Tape measure and chalk line
Underlayment (if not pre-attached)
Knee pads and a rubber mallet

Step by step

Acclimate the flooring Leave the unopened boxes in the room 48 hours so the planks adjust to its temperature and humidity.
Flatten and clean the subfloor The subfloor must be flat (within ~3/16" over 10 ft), clean, and dry. Sand high spots, fill low ones — bumps telegraph through and pop seams.
Roll out underlayment Lay underlayment (unless the planks have it attached) for cushion, sound, and a moisture break over concrete.
Plan the layout Measure so you don't end with a sliver row, and run planks the long way / toward the main light. Stagger end joints at least 6".
Click rows with an expansion gap Leave a 1/4–3/8" expansion gap at every wall (hidden by baseboard/quarter-round). Click rows together, tapping snug with the block.
Add transitions Finish doorways and floor changes with transition strips, and reinstall baseboard or shoe molding.

Common mistakes

Skipping acclimation

Planks that haven't adjusted expand or contract and pop apart. Give them 48 hours in the room.

No expansion gap at the walls

Floating floors move. Leave 1/4–3/8" all around or the floor buckles in summer.

Installing over an uneven subfloor

Dips and bumps cause clicking, gaps, and broken locks. Flatten the subfloor first.

Safety

Wear eye protection when cutting planks.
Knee pads save your knees over a long install.

Frequently asked questions

How much flooring do I need?

Enter the room size above — the calculator defaults to 10% waste, rounds up to whole boxes, and prices that purchased coverage. Change the waste, box coverage, and price to match your product; separate underlayment is optional.

Do I need underlayment?

Yes, unless it's pre-attached to the planks — it adds cushion, quiets the floor, and breaks ground moisture over concrete.

How big should the expansion gap be?

1/4–3/8" at every wall and fixed object, hidden under the baseboard or quarter-round.