Baseboard & Trim Calculator
Enter the room size to get the linear feet of trim and how many sticks to buy — works for baseboard, crown, shoe, and chair rail.
Room
You'll need
Room perimeter0 ft
Trim run (+10% waste)0 ft
Pieces (16 ft each)
0
Applies to baseboard, crown, shoe, and chair rail. Buy a spare stick for miter mistakes.
How to measure for trim
Total the wall lengths around the room (2 × (length + width)), subtract doorways, add ~10% for miters and mistakes, then divide by the stock length you're buying. Round up.
Measure every room of the job at once
ProBuildCalc turns your iPhone's LiDAR scanner into a job-site measuring kit — walk the space and it captures the square footage, material takeoff, and a blueprint automatically. No tape measure, no graph paper.
Baseboard calculator FAQ
- How do I calculate how much baseboard I need?
- Add up the room's perimeter — 2 × (length + width) — subtract the width of each doorway, and add about 10% for waste and miter cuts. Divide by your stock length for the number of pieces.
- How much trim waste should I add?
- Add 10% for a normal room and 15% for rooms with lots of corners, jogs, or short walls where offcuts can't be reused.
- Does this work for crown molding and chair rail?
- Yes. The linear-foot math is the same for baseboard, crown, shoe molding, and chair rail — crown just won't subtract doorways.
- What length baseboard should I buy?
- Longer 16-ft sticks mean fewer seams on long walls; 8-ft pieces are easier to transport and handle. Pick the longest length your walls and vehicle allow.