How to calculate baseboard
Baseboard follows the perimeter of the room, minus the openings:
Linear feet = (perimeter − doorways) × (1 + waste %)
Perimeter is 2 × (length + width). We subtract about 3 feet for each standard doorway, add your waste allowance for cuts and mitered corners, then divide by your trim length to get the number of pieces, rounded up.
Common trim lengths
| Piece length | Good for |
|---|---|
| 8 ft | Easy to handle; most rooms |
| 12 ft | Fewer joints on long walls |
| 16 ft | Long, unbroken runs |
Baseboard materials and styles
The material decides the price and whether you paint or stain it:
- MDF. The cheapest, smoothest paint-grade option — comes pre-primed, but it swells if it gets wet.
- Finger-joint pine. Solid wood made for painting, with glued joints hidden under primer.
- Solid wood (pine, oak, poplar). For a stained, natural look or where durability matters; costs more.
- PVC / polystyrene. Waterproof trim for bathrooms, basements, and exterior use.
Heights run from a modest 3¼ in up to 5¼ in or taller for a more substantial look — taller profiles suit higher ceilings.
Don't forget the finishing touches
- Shoe molding or quarter-round covers the gap where the baseboard meets an uneven floor — add a second pass of the perimeter if you're using it.
- Caulk and filler for the top edge and nail holes, plus paint or stain.
- Going bigger up top? Pair it with crown molding — size that with our crown molding calculator.
How much does baseboard cost?
Trim runs about $6–$25 per piece (roughly $1–$3 per linear foot) — MDF and finger-joint pine at the low end, solid hardwood and tall profiles higher. Pro installation typically adds $1–$3 per linear foot.
Tips
- Plan long walls first. Use full lengths on the longest walls to minimize visible seams.
- Corners eat material. Mitered inside and outside corners create offcuts — keep the 10% buffer.
- Buy matching shoe molding if your floors aren't perfectly flat.
How to install baseboard
- Start with the longest wall. Cut the first piece square end-to-end and set it tight into both corners.
- Cope inside corners. Leave one piece square in the corner and cope the mating piece — cut its profile so it nests over the first. Coped joints stay tight even when walls aren't square.
- Miter outside corners. Cut both pieces at 45° (or split the real angle) so they wrap the corner cleanly.
- Nail into the studs. Fasten near the top and bottom with a brad or finish nailer, hitting studs where you can.
- Fill and caulk. Fill nail holes, caulk the top edge and any corner gaps, then touch up the paint.