How much baseboard do I need for a 14 × 12 ft room?
For the worked example (a 14 × 12 ft room, 6 ft of doorways, 8 ft pieces) the material list is Baseboard: 7 × 8 ft pieces (calculated 6.33 pieces (estimated), based on 8 ft pieces, 10% extra). Quantities to buy are whole units rounded up from the calculated amounts. Enter your own measurements in the calculator above for your exact list.
How to use this calculator
- Choose baseboard or crown (continuous) trim, then enter each rectangular room. Use “Add another room” for more.
- For baseboard, enter the total width of the doorways it stops at.
- Enter the length of the pieces you will buy, and keep or change the extra allowance.
- Copy, print or share the material list.
How this is calculated
- Room perimeter = 2 × (length + width), added over every room
- Net run = perimeter − doorways (baseboard only)
- With allowance = net run × (1 + allowance ÷ 100)
- Pieces = round up (with allowance ÷ stock piece length)
Geometry is deterministic. Material coverage, density, installation waste and product yield can vary. We expose those assumptions so you can replace them with the values printed on the products you are actually buying. Treat every result as an estimate. Items on your list are labelled Calculated (straight from your measurements) or Estimated (depends on an assumption), and “Buy” quantities are whole units rounded up.
Sources
No third-party figure is built into this calculator. Quantities come from geometry and from the values you can see and edit under “Assumptions” below, each labelled by where it comes from.
Last reviewed: . See the methodology.
Assumptions
These starting values are used until you change them. They are typical, not universal. Check the label on the product you are buying.
| Assumption | Starting value | Where it comes from |
|---|---|---|
| Room perimeter | 2 × (length + width) | Mathematical – Summed over every rectangular room you add |
| Stock piece length | You enter it | You enter it (product / supplier) |
| Extra allowance | 10% | Common planning default |
Worked example
A 14 × 12 ft room with 6 ft of doorways, 8 ft pieces and 10% extra:
- Baseboard: 7 × 8 ft pieces (56 ft supplied) · 8 ft pieces, 10% extra
Common questions
Why does crown not subtract doorways?
Crown and other trim that runs the full perimeter passes over doorways, so nothing is taken off. Baseboard stops at them.
Is the piece count exact?
No, it is an estimate. Corners, miter cuts, joints and defects mean the real number depends on how you cut, so keep the allowance for your layout.
What about shoe molding or chair rail?
They are the same calculation: a run of linear trim in stock-length pieces. Pick crown or continuous mode if the run does not stop at doorways.