Rex says
Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.
Try a scenario
Click to load — tweak from there.Inputs
Result
Baseboard needed
60
linear ft
Net wall run (before waste)
54.0
ft
Equivalent 8ft boards
8
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One click, a permanent link with your numbers baked in.
How to use this
- 1Enter room perimeter (ft).
- 2Enter total door opening width (ft).
- 3Enter waste factor (%).
- 4Read your baseboard needed on the right — it updates as you type.
- 5Hit Share to keep the scenario or send it to someone.
About this calculator
Baseboard is sold by the linear foot or in fixed-length boards, and the amount needed is based on a room's perimeter rather than its floor area, with door openings subtracted out since baseboard doesn't run across a doorway threshold. This calculator takes your room's total perimeter and the combined width of all door openings, subtracts the openings from the perimeter to get the actual run length, then adds a waste factor to cover mitered corner cuts, which lose a small amount of material at every inside and outside corner, plus the reality that boards come in fixed lengths (typically 8, 12, or 16 feet) that rarely divide evenly into a room's wall runs without some offcut waste. A 10% waste factor is standard for a simple rectangular room, while rooms with lots of corners, closets, or angled walls should use 15%+ since more corners mean more mitered cuts and more small offcuts that can't be reused elsewhere in the room.
Worked example
Using the values the calculator loads with:
Inputs
- Room perimeter: 60 ft
- Total door opening width: 6 ft
- Waste factor: 10 %
Results
- Baseboard needed: 60
- Net wall run (before waste): 54
- Equivalent 8ft boards: 8
What each field means
Inputs
- Room perimeter (ft)
- The room perimeter used in the calculation, measured in ft. Starts at 60 ft so you have a working example on load.
- Total door opening width (ft)
- The total door opening width used in the calculation, measured in ft. Starts at 6 ft so you have a working example on load. Accepted range: 0–40 ft.
- Waste factor (%)
- The waste factor used in the calculation, measured in %. Starts at 10 % so you have a working example on load. Accepted range: 0–30 %.
Results
- Baseboard needed
- linear ft
- Net wall run (before waste)
- ft
- Equivalent 8ft boards
- Returned as a whole number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
Do I subtract doorways from the room perimeter?
Yes, baseboard doesn't run across a door opening's threshold, so subtracting the total width of all door openings from the perimeter gives the actual linear footage of baseboard needed.
How much waste should I plan for baseboard?
10% covers a simple rectangular room with standard 90-degree corners, while rooms with more corners, closets, bump-outs, or angled walls should use 15% or more since each additional corner requires a mitered cut that loses material.
What standard lengths does baseboard come in?
8, 12, and 16-foot boards are the most common standard lengths at most lumber yards and home centers, and choosing a length that minimizes seams along your longest wall runs reduces both material waste and visible joints.
Should I round up to a whole board or buy by the linear foot?
If your supplier sells fixed-length boards, round up to the nearest whole board per wall run to minimize seams; if they cut custom lengths to order, you can buy closer to the exact linear footage needed.
Accuracy and limitations
- Estimates assume standard, average conditions — local rules, pricing, and materials vary.
- Results are rounded for readability; add a buffer before ordering, booking, or committing.
- Double-check anything with a real cost attached against a local quote.
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Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Baseboard Linear Feet Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/baseboard-linear-feet-calculator
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/baseboard-linear-feet-calculator" target="_blank" rel="noopener">Baseboard Linear Feet Calculator — RevenueLab</a> (2026).</p>
Source: [Baseboard Linear Feet Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/baseboard-linear-feet-calculator) (2026).