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Flooring Calculator

Room length

Room width

Waste allowance

Boxes to buy

Floor area: 192
With waste: 211

HI data benchmark

The estimate above is personalized to your inputs. These are HI's independent market reference figures from its data layer — each shown with its source and confidence.

Where	Measure	Value	Confidence
US national · Interior painting (home project)	Low (USD per room repaint)	$200	Modeled estimate
US national · Interior painting (home project)	Median (USD per room repaint)	$450	Modeled estimate
US national · Interior painting (home project)	High (USD per room repaint)	$900	Modeled estimate

Dataset: US Local Service & Home-Project Cost — see data products

v0 values are modeled estimates pending verified collection. Educational use, not financial advice.

Find how much flooring to buy, including a waste allowance for cuts.

By Jordan P. · Reviewed by Cara M., Licensed Contractor · Updated 2026-06-03

How to use this calculator

Enter the room length and width in feet.
Set a waste allowance — 10% for straight layouts, 15–20% for diagonal or patterned.
Under Advanced, set the coverage per box from the product label.
Round up to whole boxes and keep a spare for future repairs.

Formula

Boxes = ⌈ (L × W × (1 + waste)) ÷ box coverage ⌉

L, W — room length and width
waste — extra for cuts (10% straight, 15–20% diagonal)

Worked example

A 16 × 12 room is 192 ft². Adding 10% for cuts gives about 211 ft² — roughly 10 boxes at 22 ft² per box.

Frequently asked questions

How much waste should I add?

10% for straight layouts, 15–20% for diagonal or patterned installs.

Why round up boxes?

Flooring sells by the box, and you want extra for cuts and future repairs.

Does this work for tile?

Yes — enter the tile box coverage.

What about irregular rooms?

Split the space into rectangles, calculate each, and add them.

Should I keep leftovers?

Yes, keep a spare box for replacing damaged planks later.

Related calculators

Jordan P. · Author

Reviewed by Cara M., Licensed Contractor · Updated 2026-06-03

Sources

Manufacturer install guides (typical) — Waste factors.

Methodology · Report an error

Embed this calculator

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View answer.json (AI feed)

{
  "tool": "flooring",
  "question": "How does the Flooring Calculator work?",
  "answer": "Find how much flooring to buy, including a waste allowance for cuts.",
  "formula": "Boxes = ⌈ (L × W × (1 + waste)) ÷ box coverage ⌉",
  "inputs": [
    {
      "id": "length",
      "label": "Room length",
      "unit": "ft"
    },
    {
      "id": "width",
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      "unit": "ft"
    },
    {
      "id": "waste",
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      "unit": "%"
    },
    {
      "id": "box",
      "label": "Coverage per box",
      "unit": "ft²"
    }
  ],
  "sources": [
    {
      "name": "Manufacturer install guides (typical)",
      "url": "https://www.hiinformation.com/methodology/",
      "note": "Waste factors."
    }
  ],
  "updated": "2026-06-03",
  "methodology": null,
  "datasets": [
    "dataset.us.local_service_cost.v1"
  ],
  "benchmark": [
    {
      "where": "US national",
      "measure": "attribute.cost.low",
      "value": 200,
      "unit": "USD per room repaint",
      "confidence": "estimated"
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    {
      "where": "US national",
      "measure": "attribute.cost.median",
      "value": 450,
      "unit": "USD per room repaint",
      "confidence": "estimated"
    },
    {
      "where": "US national",
      "measure": "attribute.cost.high",
      "value": 900,
      "unit": "USD per room repaint",
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    }
  ]
}