How Much Baseboard Do You Need? Quick Buying Guide
Baseboard is bought by linear foot, and the quick math is: room perimeter, minus doorway widths, plus 10% waste for miter cuts. A typical 12×14 bedroom with two doorways needs about 50 linear feet.
The formula
Perimeter = 2 × (length + width). A 12×14 room: 2 × 26 = 52 feet. Subtract two standard 3-foot doorways: 46 feet. Add 10% for miter waste: about 51 feet. Our baseboard calculator runs this instantly and also tells you how many sticks to buy at 8, 12, or 16 feet.
Why trim waste works differently
Unlike tile or flooring, baseboard waste comes almost entirely from corners, not the material itself — every inside corner is coped, every outside corner mitered, and walls are never perfectly square. A wall a degree off means recutting a miter shorter each attempt. That's why 10% is the floor, not the ceiling, for a first trim job.
Buy longer sticks than you think
Fewer splices mean fewer visible gaps as wood moves seasonally. Buy sticks longer than your longest wall wherever the material and your vehicle allow — a 16-ft stick on a 15-ft wall means zero mid-wall joints.
Put it to work: every number in this guide comes straight from our free calculators — browse all 18 tools and get a shopping list for your own project.