Baseboard & Trim Calculator
Measure your room once and get the linear feet, number of trim pieces, and cost for baseboard — plus optional crown molding — with waste built in.
How to Calculate Baseboard & Trim
Baseboard runs around the perimeter of the room, so start with 2 × (length + width). Subtract about 3 feet for each doorway opening, since trim doesn't cross them. That gives the bare linear footage. Add roughly 10% for waste — miter cuts, mistakes, and the offcuts left over at the end of each board — and you have the amount to buy.
To convert linear feet into pieces, divide by the length of the trim stock you're buying (commonly 12 or 16 ft) and round up. Crown molding follows the same perimeter but isn't reduced for doorways, since it runs continuously at the ceiling. Enter a price per linear foot and this calculator also returns a quick material cost estimate.
Frequently Asked Questions
How do I calculate baseboard for a room?
Measure the room's perimeter — 2 × (length + width) — and subtract about 3 feet for each doorway. Add 10% for waste, then divide by your trim length to get the number of pieces. This calculator does all of that as you type.
How much trim should I buy extra?
Plan on about 10% extra for baseboard and trim. The overage covers angled miter cuts at corners, the occasional bad cut, and short offcuts you can't reuse. Buy a little more for rooms with lots of corners or jogs.
How many pieces of baseboard do I need?
Take your total linear feet including waste and divide by the length of each board (often 16 ft), then round up to whole pieces. For example, 60 linear feet in 16-foot pieces means four boards.
Turn Your Measurements Into a Real Floor Plan
Once you know your dimensions, generate a labeled, to-scale floor plan in seconds — then export it to DXF or build it in 3D. No CAD experience needed.
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