Baseboard & Trim Calculator
Calculate how much baseboard trim you need for any room. Enter your room dimensions, door openings, and trim length to get total linear feet, number of pieces, corner counts, and cost estimates — perfect for renovation or new construction projects.
Enter Your Room Details
Full Breakdown
Room Perimeter
Door Deductions
Net Linear Feet
With Waste
Pieces Needed
Inside Corners
Outside Corners
Estimated Cost
How to Use This Calculator
- Enter your room length and width in feet.
- Specify the number of doorways and average door width to deduct.
- Choose the trim piece length you plan to buy (8, 10, 12, or 16 ft).
- Set the waste factor — 10% is standard for miter cuts and mistakes.
- Enter inside/outside corners so you know how many corner pieces you need.
- Click "Calculate Baseboard" for your full material list.
The Formula
Perimeter = 2 × (Length + Width)
Net Linear Feet = Perimeter − (Doors × Door Width)
Total with Waste = Net LF × (1 + Waste%/100)
Pieces = ⌈Total LF ÷ Trim Piece Length⌉
Always round up to whole pieces. A standard room has 4 inside corners (one per wall joint). Add outside corners for bump-outs, columns, or peninsula walls.