Start with the actual trimmed runs
Use independent runs for a quick length plan, or link runs to measured walls so their door boundaries stay with the room. A doorway removes the interval where baseboard is absent. Measure that interval between the actual casing or plinth stops.
Keep finished run demand separate from cutting references and procurement. An outside miter, inside miter, cope, or return can change how the measured wall line relates to a piece’s long point, short point, or blank. A single perimeter-minus-doors total cannot describe those ends.
Worked layout
12 × 10 ft room with one 36 in doorway
Example measurements
- Room
- 12 × 10 ft
- Door casing deduction
- 36 in
- Profile face / thickness
- 4 / ¾ in
Layout result
- Door deduction
- 36 in
- Finished front-face length
- 40 ft 6 in
- Wall-face runs / long-point blanks
- 41 ft
- Finished pieces
- 5
Label the endpoints on the room sketch
Give each straight run an ID and measuring direction. Record both stops: casing, inside corner, outside corner, cabinet, return, or another finish. Measure near the height and plane where the baseboard will sit, and note any disagreement with a higher wall reading.
Deduct the same doorway only once. Either enter its surviving side runs directly or retain a complete wall with its measured door interval. Include short returns and closet runs explicitly; do not subtract a high window that leaves the floor trim uninterrupted.
Choose the corner or scarf before the cut
The supported right-angle end details distinguish inside and outside miters, square stops, copes, and returns. Use the actual profile thickness to interpret their cutting references. A cope provides the needed blank and a field-fit reminder, not an invented curve matching an unknown profile.
If a long run needs a scarf, enter the intended position within the surviving run. The planner must not invent seams to make short stock fit. Recheck that the chosen joint is acceptable at that location and has the required real-world support.
Compare usable stock by profile
Assign the actual baseboard profile and stock length, then enter kerf, end trimming, and spare material. Keep shoe molding and other profiles separate. Existing compatible pieces can remain in the layout without being counted as a new purchase.
Review the longest continuous piece before accepting the aggregate footage. A stock board must fit that piece with its allowances, or the plan needs a resolved scarf. The proposed grouping estimates stock for the entered conditions; it does not prove the globally smallest possible order.
Check the trim where it meets the room
Fit a sample beside the door casing and over the finished floor. Uneven flooring, corners that are not 90 degrees, and profile transitions need specific fitting decisions. Keep each unresolved condition attached to its run.
This page plans decorative floor trim, not baseboard heaters or structural work. Heating output, electrical loads, hidden services, fastening, and substrate preparation are separate tasks.
Baseboard Calculator questions
Will long pieces be split automatically?
No. Enter an allowed scarf position or select stock long enough for the continuous piece.
Does the estimate include kerf and end trim?
Those are explicit settings of the selected material profile. Complete them before relying on the stock result.
Can I use an irregular room sketch?
Yes. Enter independent straight runs and their actual endpoints. They are not assumed to form a closed rectangle.