Baseboard Calculator: Linear Feet and Pieces
Work out how much baseboard or trim a room needs. Enter the room length and width, subtract any doorways, then set the piece length to get linear feet and the number of pieces.
How to estimate baseboard for a room
- Enter the room length and width in feet.
- Set how many doorways to subtract and their width, plus a waste allowance.
- Read off the linear feet and the number of pieces to buy.
Examples
12 by 10 ft room, 2 doors, 8 ft pieces
L 12, W 10, 2 doors at 3 ft, 8 ft pieces, 10% waste
44 ft perimeter, 41.8 linear ft, 6 pieces
Frequently asked questions
How do I measure baseboard for a room?
Add up the length of every wall, which for a rectangular room is twice the length plus twice the width. Then subtract the width of each doorway, since baseboard does not run across an opening.
Do you subtract doorways but not windows?
Yes. Baseboard runs under windows, so only door openings are removed. The calculator subtracts each doorway at its width, defaulting to 3 feet per standard interior door.
How much extra baseboard should I buy?
Around 10 percent covers miter cuts at corners, the occasional miscut and matching across joints. Rooms with many corners or returns use more, so raise the waste for a complex layout.
What length do baseboards come in?
Common lengths are 8, 12 and 16 feet. Longer pieces mean fewer seams on long walls but are harder to carry and transport. The calculator divides your linear feet by the piece length you choose.
Should I round pieces up?
Yes. Trim is sold in whole sticks, so the piece count is always rounded up. Buying one spare stick is wise for a bad cut or a future repair that needs a matching profile.
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