How Much Baseboard Do I Need? (2026 Guide)

The baseboard math, step by step

Baseboard is priced per linear foot but sold in fixed stick lengths (8 ft is standard). The plan: measure the perimeter, subtract the doors, add cut waste, count sticks — we'll run a 12×12 room with one door through all four steps.

1. Add the walls for the perimeter

A rectangle's perimeter is 2 × (length + width): 2 × (12 + 12) = 48 ft for the 12×12 room. On L-shaped rooms, add up every wall you'll cover.

2. Subtract the door openings

Baseboard stops at the door casing rather than running through the doorway, so deduct about 3 ft per door: 48 − 3 = 45 ft of net run. Two openings (an entry plus a closet) lose about 6 ft total.

3. Add ~10% for cut waste

Outside corners take two miter cuts each, inside corners are coped or butted, and a miscut is normal on any job. Multiply the net run by 1.1: 45 × 1.1 ≈ 50 ft. Skip the buffer and you'll come up short on the last wall.

4. Count 8-ft sticks and round up

Divide the waste-inclusive length by the stick length: 50 ÷ 8 ≈ 6.3, so you buy 7 sticks of 8-ft baseboard (56 ft of board). Six sticks total just 48 ft — enough for the net run, not for the cuts. Measuring a 12×12? The full 12×12 bedroom material plan lines up baseboard with paint, flooring and trim.

Baseboard for common room sizes

Net runs below assume 3 ft subtracted per door opening; stick counts are the minimum to reach that net run:

Stick counts are before cut waste — apply the 10% allowance when you order: the 12×12 row nets 45 ft (6 sticks minimum) but needs 45 × 1.1 ≈ 50 ft → 7 sticks. Rows with a 6-ft deduction assume two door openings.

Doors, corners and longer sticks

Standard interior doors run 30–36 in wide, so deduct ~3 ft per opening you don't cross. Pocket doors can let the run continue, and windows never interrupt baseboard (it runs underneath).

Corners eat length: an outside corner takes two 45° miter cuts and a bad cut gets redone, while inside corners are coped or butted. The 10% buffer covers an ordinary room; add a full extra stick on corner-heavy spaces like hallways. On long runs, 12-ft or 16-ft sticks are worth the premium — fewer seams.

Ordering and finishing tips

• Give corners their margin — outside corners need two 45° miters and inside corners a coped joint, so keep the 10% allowance and round up on corner-heavy rooms.
• Paint before you install, or install and touch up — pre-finishing coats the bottom edge that sits against the floor and keeps paint off the walls; installing first means filling nail holes and caulking, then a finish pass. Either works — estimate your trim paint first so the top coat covers everything.
• Buy every stick from the same batch — stained and factory-primed runs can shift between lots, so pull all sticks from one delivery and keep one spare for repairs instead of chasing a match later.

Planning more than one room? Match the complete 12×12 bedroom material list against the paint for a 12×14 bedroom too.

Estimate your trim paint →