Finishes
Baseboard Trim Calculator
Enter the room length and width, the number of doors and their width, and any other openings where trim stops. You get the perimeter, the net length after openings, the length with waste and whole sticks to buy. Corners are covered by the waste allowance rather than counted one by one.
Result
Planning estimate- Room perimeter
- 54.00 ft
- Openings to subtract
- 6.00 ft
- Net linear feet
- 48.00 ft
- Linear feet with waste
- 52.80 ft
- Sticks needed
- 7
2 times (length + width).
Door openings plus other openings.
Perimeter less openings, never below zero.
10% waste added.
8 ft sticks, rounded up.
How it is calculated
- 1 Room perimeter = 2 x (length + width).
- 2 Openings to subtract = (number of doors x door width in inches / 12) + other openings in feet.
- 3 Net linear feet = perimeter - openings, never below zero.
- 4 Linear feet with waste = net linear feet x (1 + waste % / 100).
- 5 Sticks needed = linear feet with waste / stick length, rounded up to a whole stick.
Assumptions to confirm
- Waste allowance
- 10% is a typical allowance for offcuts, cutting mistakes and mitered corners in a simple room. It is a starting point, so confirm it against how your crew cuts and joins trim.
- Corners
- Inside and outside corners need miter or coped cuts that use extra length. They are not counted separately, so add more waste for rooms with many corners or bay walls.
- Door openings
- Each door opening is taken as the door width you enter, with no allowance for the frame. Enter door width in inches. Trim usually stops at the frame, so check your actual openings.
- Other openings
- Closets, cased openings, built-ins and fireplaces are not detected. Add their widths in feet, not inches.
- Stick lengths
- Trim is treated as 8, 12 or 16 ft sticks with the total length divided evenly. In practice, runs are cut from whole sticks, so a run that just misses a stick length can waste more. The waste allowance is meant to cover that.
This is an early planning estimate, not a quotation. Check quantities against your drawings, your specification and the manufacturer's data.
Questions about this calculator
How do I calculate baseboard for a room?
Add the room length and width, double it for the perimeter, subtract door and other openings, add waste and divide by the stick length. Round up to a whole stick.
Do I subtract door openings from baseboard?
Usually yes, because baseboard does not run across a door opening. This calculator subtracts the door width you enter for each door.
How much extra baseboard should I buy?
Ten percent is a common allowance for offcuts and corner cuts, but rooms with many corners need more. Confirm with your installer.
Is baseboard sold in different lengths?
Baseboard is commonly sold in sticks of 8, 12 and 16 ft, though availability varies by product and supplier. Longer sticks mean fewer joints on long walls.
Related tools
- Room Finish Areas Floor, ceiling and wall areas plus baseboard length for a rectangular room. Open
- Flooring Quantity Boxes of flooring to buy from room size, waste and coverage per box. Open
- Feet and Inches to Decimal Turn a size like 3'-0 1/2" into decimal inches, decimal feet and millimeters. Open
Take these numbers off the drawings
Estimateria reads the door, hardware and finish schedules out of your PDFs into a priced grid, so the quantities you check here start from the set instead of a retype.