Baseboard & Trim Calculator: 12 × 12 ft room
Find the linear feet and number of baseboard pieces for a room, with doorways removed and waste for cuts.
// Bill of materials
Costs are rough, materials only — edit the price to match your quote.
Pre-filled for a 12 × 12 ft room. Change any value to recalculate, or start from scratch.
How it's calculated
Perimeter = 2 × (width + length). We subtract about 3 feet per doorway, add waste for miter cuts, then divide by the length of one piece and round up.
Worked example — 12 × 12 ft room
- Room width
- 12 ft
- Room length
- 12 ft
- Doorways
- 1 count
- Piece length
- 12 ft pieces
- Waste allowance
- 10 %
- Price per foot
- 2 $/ft
Nearby sizes
| Room size | Pieces to buy | |
|---|---|---|
| 8 × 8 ft room | 3 pieces | Open |
| 8 × 10 ft room | 4 pieces | Open |
| 8 × 12 ft room | 4 pieces | Open |
| 10 × 10 ft room | 4 pieces | Open |
| 10 × 12 ft room | 4 pieces | Open |
| 10 × 14 ft room | 5 pieces | Open |
| 10 × 16 ft room | 5 pieces | Open |
| 12 × 12 ft room (this page) | 5 pieces | |
| 12 × 14 ft room | 5 pieces | Open |
| 12 × 16 ft room | 5 pieces | Open |
| 12 × 18 ft room | 6 pieces | Open |
| 12 × 20 ft room | 6 pieces | Open |
Tips for buying baseboard & trim
- Miter cuts and mistakes eat trim fast — 10% waste is a sensible minimum, more for lots of corners.
- Buy the longest pieces that fit your walls to minimize seams on long runs.
- Account for outside corners; they waste more than inside corners because of the miter direction.
- Paint or stain trim before installing, then just touch up the nail holes — far faster than cutting in later.
- Keep a couple of extra feet for scribe pieces and future repairs.
- Don't forget quarter-round or shoe molding if your floor isn't perfectly flat.
Frequently asked questions
How much baseboard do I need for a 12x14 room?
The perimeter is 52 ft. Minus one 3 ft doorway and with 10% waste that's about 54 ft — five 12 ft pieces.
How do I account for doorways?
Subtract about 3 feet of baseboard per doorway, since trim doesn't run across an opening. Set the doorway count and we handle it.
How much extra trim for waste?
10% is a good minimum for miter cuts; go higher for rooms with many corners or angled walls.
What length pieces should I buy?
Longer pieces mean fewer seams but are harder to handle. Pick 8, 12 or 16 ft and we compute the piece count.