Flooring Calculator
Estimate laminate, vinyl plank or wood flooring: area from up to three rectangles, waste, whole boxes, material cost, plus your labor and underlayment quotes.
Interactive calculator · Method FLOORING-COST-1.0 · Last reviewed: 2026-11-04
Calculate your scenario
Floor area = sum of each length × width − the excluded area.
Your inputs
Default worked example. Edit the inputs to calculate your scenario.
Default worked example
(144 − 0) sq ft × (1 + 10%) = 158.4 sq ft ÷ 20 sq ft per box = 8 boxes; $360.00 + $0.00 + $0.00 = $360.00.
How to use the calculator
Split the room into up to three rectangles, subtract fixed cabinets or islands, enter a waste allowance and the coverage printed on the box, then the price and any labor or underlayment quotes.
What the result means
A 12 × 12 ft room is 144 sq ft; with 10% waste you need 158.4 sq ft, so 8 boxes of 20 sq ft, which is $360 at an example $45 per box.
Formula and units
Floor area = sum of each length × width − the excluded area. Boxes = floor area × (1 + waste %) ÷ coverage per box, rounded up. Material = boxes × price per box, or boxes × coverage × price per sq ft (you pay for whole boxes). Underlayment and labor = floor area × your per-sq-ft quotes. Total = material + underlayment + labor.
Worked examples
12 × 12 ft bedroom, $45 boxes: Room part 1 length: 12 ft; Room part 1 width: 12 ft; Room part 2 length (0 if none): 0 ft; Room part 2 width: 0 ft; Room part 3 length (0 if none): 0 ft; Room part 3 width: 0 ft; Area not floored (cabinets, island): 0 sq ft; Waste and cutting allowance: 10 %; Coverage per box (from the box label): 20 sq ft; Flooring price (example $45 per box): 45 $ per box or sq ft; Underlayment price (your quote; 0 to skip): 0 $ per sq ft; Installation labor (your quote; 0 to skip): 0 $ per sq ft; Flooring price basis: box.
Example result: Boxes to buy: 8 boxes (160 sq ft for 158.4 sq ft needed); Floor area to cover: 144 sq ft; Flooring material cost: $360.00; Underlayment cost: $0.00; Labor cost: $0.00; Total estimated cost: $360.00.
L-shaped room priced per sq ft with labor and underlayment: Room part 1 length: 15 ft; Room part 1 width: 12 ft; Room part 2 length (0 if none): 6 ft; Room part 2 width: 4 ft; Room part 3 length (0 if none): 0 ft; Room part 3 width: 0 ft; Area not floored (cabinets, island): 6 sq ft; Waste and cutting allowance: 8 %; Coverage per box (from the box label): 22.5 sq ft; Flooring price (example $45 per box): 2.49 $ per box or sq ft; Underlayment price (your quote; 0 to skip): 0.5 $ per sq ft; Installation labor (your quote; 0 to skip): 2 $ per sq ft; Flooring price basis: sqft.
Example result: Boxes to buy: 10 boxes (225 sq ft for 213.84 sq ft needed); Floor area to cover: 198 sq ft; Flooring material cost: $560.25; Underlayment cost: $99.00; Labor cost: $396.00; Total estimated cost: $1,055.25.
Limitations and common mistakes
Prices, labor and underlayment rates are your own quotes; nothing here is a local market price. Trim, transitions, moisture barrier, subfloor repair, removal and disposal are not included. Diagonal or herringbone layouts and many small rooms need a larger waste allowance than straight lay.
Buying exactly the room area without a cutting allowance, then running short on the last row when the extra box is a different production lot.
Sources and assumptions
Method FLOORING-COST-1.0; last formula review 2026-11-04. Sources and their supported claims. Calculation methodology.