Material calculator
Baseboard & trim calculator — linear feet + pieces
Estimate baseboard or trim length and stick count from room perimeter, door deductions, stick length, and trim waste for miters and copes.
You'll need
6 pieces
Trim sticks
- Trim length
- 47 linear ft
- Net perimeter
- 42 linear ft
What this assumes
- Perimeter = 2 × (12 ft + 12 ft), minus 2 door openings at 3 ft each.
- 10% waste is added before dividing by 8 ft stick length.
Coverage rates & sources
Every number this calculator uses is a published engineering constant — not an estimate we made up. Here is exactly what it assumes and where each value comes from.
- Perimeter formula: 2×(L+W)Source: Geometry — rectangular room perimeter formula
- Door-opening deduction: ~3 ftSource: Standard 32–36" door opening (no baseboard across)
- Trim waste allowance: 10%Source: Standard trim waste for miter cuts/coping (carpentry rule of thumb; 15% for many corners)
- Stick length: 8 or 16 ftSource: Standard millwork lengths
Before you buy
- Counts running length only; inside and outside corners need miter or coped joints that waste a few inches each.
- Closets, bays, stairs, and built-ins add length that is not included in a simple rectangular room.
- Door openings are deducted; cased openings without doors may need different treatment.
This is a planning estimate, not a substitute for a pro's on-site measurement. For load-bearing, structural, or code-regulated work, confirm quantities with a licensed contractor.
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