Flooring Calculator
Calculate flooring for a room and its cost. Enter the dimensions and box coverage, add a waste allowance and price per box, and we'll size the order.
Example: with Room length 12 ft · Room width 15 ft · Coverage per box 20 sq ft · Waste allowance 10% → Boxes needed: 10 boxes.
- Floor area180.0 sq ft
- Area incl. waste198.0 sq ft
Computed by the calculator below using its default values. Change any input to see your own numbers.
3D floor · drag to rotate
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Check it outOrder by the box, plan for waste
Flooring comes in boxes that each cover a set area, so you round up to whole boxes. Add 10% for waste on straight installs and more for diagonal layouts or rooms with many angles. Enter the price per box to budget, and keep a spare box — dye lots shift between production runs.
How it’s calculated
Boxes = area × (1 + waste) ÷ coverage per box, rounded up.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Forgetting waste for cuts and a spare box for repairs.
- Mismatching dye lots by buying boxes later.
Frequently asked questions
How much extra should I buy?
10% for straight layouts; 15% for diagonal patterns, long planks, or complex rooms.
What if my room isn't rectangular?
Split it into rectangles, calculate each, and add them together before applying waste.
Do I need underlayment?
Often yes, unless the flooring has an attached pad. Budget it separately from the boxes.