Baseboard Calculator
Measure baseboard or trim by room perimeter.
Enter your room dimensions and the total width of any doorways to subtract, and get the linear feet of baseboard or trim needed plus the number of pieces at your chosen length.
How it works
Baseboard follows the room perimeter: 2 × (length + width). Subtract doorway openings, then divide by your trim piece length and round up. Add a little extra for miter cuts at corners and any mistakes.
Frequently asked questions
How much baseboard do I need?
Add up the room perimeter (2 × length + 2 × width), subtract doorway widths, then divide by your piece length. A 12×10 room with one 3-ft doorway needs about 41 linear feet.
How many pieces of trim is that?
Divide the linear feet by your trim length and round up. 41 linear feet in 8-ft pieces is 6 pieces.
Should I buy extra trim?
Yes — add about 10% for miter cuts at corners and the occasional bad cut.
Is this calculator free and private?
Yes. Every CubicCabin calculator runs entirely in your browser, so the numbers you enter are never uploaded or stored. There's no sign-up, no limits, and it keeps working even if you lose connection after the page loads.