Paint & interior · updated 2026
Baseboard Calculator — Linear Feet
Baseboard is a perimeter problem minus the doorways — no trim runs across a door opening. This baseboard calculator takes your room's length and width, subtracts ~3 ft per door opening, adds 10% for miter waste, and returns linear feet with 2026 material costs. It covers baseboard only; if you're adding shoe molding, budget the same footage again.
Each opening subtracts ~3 ft
Show the math
Perimeter = 2 × (12 + 15) = 54 ft
Less doors = 54 − (2 × 3) = 48 ft
With 10% waste = 48 × 1.1 = 53 ft (rounded up)
Cost = 53 × $1–$2/ft (MDF) or $2–$4/ft (primed pine)
What the numbers mean
The calculator converts your measurements into a practical purchase quantity using a documented coverage or spacing assumption.
Any whole-unit quantity is rounded up so the result does not leave you short during the project.
Use the cost range as a planning baseline and confirm the final quantity, availability, and delivery charge with your local supplier.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| MDF baseboard, per ft | $1.00 – $2.00 / linear ft | Paint-grade; the budget standard |
| Primed pine baseboard, per ft | $2.00 – $4.00 / linear ft | Crisper profile, holds nails better |
| Oak baseboard, per ft | $4.00 – $8.00 / linear ft | Stain-grade |
Wave 1 Batch 3 content price guide, Sep 2026. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Cope inside corners instead of mitering — coped joints stay tight when wood moves; miters open up.
- Back-cut outside miters a degree or two so the face closes tight and any gap hides at the back.
- Nail into studs and the bottom plate, not just drywall — a stud-finder pass before you start pays off.
- Caulk the top edge after install — it hides every wall wobble and makes paint-grade trim look custom.
- Buy the full 10% extra — miscut angles are the #1 reason trim jobs stall mid-room.
- A 12×15 room with 2 doors needs 53 ft — about $53–$106 in MDF or $106–$212 in primed pine.
Common questions
Frequently asked questions
How much baseboard for a 12×15 room with 2 doors?
2 × (12 + 15) = 54 ft, minus 6 ft of doors = 48 ft, plus 10% waste = 53 ft.
How about a 10×12 bedroom with 1 door?
44 − 3 = 41 ft, plus 10% = 46 ft.
Why subtract 3 ft per door?
A standard interior door opening is about 3 ft wide — no baseboard runs across it.
Coped vs mitered inside corners?
Cope them — coped joints don't open up with seasonal wood movement; miters do.
What does 53 ft of baseboard cost?
$53–$106 in MDF, $106–$212 in primed pine.
Should I add shoe molding too?
If the floor isn't perfectly flat, a thin shoe molding hides the gaps — budget the same linear footage again.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.