Interior trim planning · Updated November 3, 2026
Baseboard length calculator
Estimate baseboard linear footage from measured wall runs, omitted door openings and an allowance you choose.
Enter each full wall run in feet, including doorway spans, then enter the widths of openings where baseboard will not be installed. Add an allowance you choose for your cuts and layout. The estimate runs in your browser and reports linear footage only.
Enter values and calculate.
Enter full wall runs before subtracting openings. Do not also enter an opening that you already omitted from a wall measurement. The allowance is your assumption, not a recommendation; the result does not select purchasable stock lengths or optimize cuts.
Sources and method
- This Old House: How to Install Baseboards (updated April 7, 2026; reviewed November 3, 2026): advises measuring each wall section, sketching the layout and noting doors or built-in obstacles; it also discusses extra material for waste. This estimator leaves the allowance to you.
Method: sum the entered full wall runs, subtract openings where no baseboard will be installed, then multiply the net length by 1 + your allowance percentage ÷ 100. Measure actual runs around closets, alcoves and other areas separately. This is a linear-foot planning estimate, not a cut list; corners, returns, joint placement, damaged material and stock lengths affect what to buy.
How it works
Enter full wall-run lengths in feet, including any doorway spans, then enter widths where baseboard will not be installed. Add only an allowance you choose. The result reports net and adjusted linear footage; it does not select stock lengths or create a cut list.
Good to know
Quick answer: how much baseboard should I estimate?
Add the full wall-run lengths, subtract widths where baseboard will not be installed, and multiply by 1 plus your chosen allowance percentage divided by 100. Measure separate alcoves, closets and returns as their own runs, and avoid subtracting an opening twice. Reviewed November 3, 2026. The result is linear footage before translating it into product stock lengths and a cut plan.
What should I measure?
Measure each wall run where baseboard is planned and sketch the layout. This Old House advises recording wall sections and noting doors or built-in obstacles; this estimator subtracts opening widths entered separately where trim will be omitted.
What allowance should I use?
The allowance field is optional only in the sense that you may enter zero; this tool does not recommend a percentage. Choose an amount based on your layout, cuts, material and experience. The estimate does not account for every corner, return, joint or damaged piece.
Does this tell me how many boards or sticks to buy?
No. It gives total linear footage only. Convert that total using the actual usable lengths sold for the selected product, then plan cuts, joints, corner details and spare material for your project.
Amazon Associates — TODO: apply/approval and configure referral URL — referral link not configured.
Impact — TODO: apply/approval and configure referral URL — referral link not configured.
CJ Affiliate — TODO: apply/approval and configure referral URL — referral link not configured.