Baseboard Calculator
Work out the linear feet of baseboard for a room, minus the doorways, and how many pieces to buy.
Baseboard needed
49.3 feet
- Pieces to buy
- 7
- Room perimeter
- 52.0 ft
You need about 49.3 linear feet of baseboard, which is 7 pieces that are 8 ft long, with a 0% waste allowance.
Calculation breakdown
| Step | Formula | Result |
|---|---|---|
| Room perimeter | 2 × (14 + 12) | 52.00 ft |
| Baseboard length after doorways | 52 − 2.67 for doorways | 49.33 ft |
| Pieces | 49.33 × (1 + 0%) ÷ 8, rounded up | 7 |
How it works
Enter the room’s length and width, the number and width of doorways, and the length of the pieces you plan to buy. Add your own waste allowance if you want one.
Worked example
A 14 ft by 12 ft room with one 32 inch doorway, using 8 ft pieces and no waste allowance:
- Perimeter: 2 × (14 + 12) = 52 ft
- Doorway: 32 ÷ 12 = 2.67 ft
- Baseboard needed: 52 − 2.67 = 49.33 ft
- Pieces: 49.33 ÷ 8 = 6.17, which rounds up to 7 pieces
Rounding
Pieces are rounded up to whole boards. Lengths are shown to one or two decimal places.
Sources
Frequently asked questions
How do you calculate how much baseboard you need?
Add up the length of every wall, then subtract the width of each doorway. For a rectangular room, the perimeter is twice the length plus the width. A 14 foot by 12 foot room has a 52 foot perimeter.
Do I subtract doors from the baseboard length?
Yes. Baseboard is not fitted across door openings, so each doorway width comes off the total. One 32 inch doorway takes about 2.7 feet off a 52 foot perimeter, leaving 49.3 feet.
How many pieces of baseboard do I need?
Divide the linear length by the length of one piece and round up. With 49.3 feet needed and 8 foot pieces, that is 7 pieces. Pieces are rounded up because you cannot buy part of a board.
How much extra baseboard should I buy?
This calculator does not assume a figure. Enter your own waste allowance for cuts and mistakes, or leave it at 0 for an exact count. Rooms with many corners need more cuts, so ask your installer.
How do I measure for baseboard in an L-shaped room?
Measure each wall and add them together, then subtract the doorways. To use this calculator, split the room into rectangles and add the results, but take away the length of any wall the rectangles share.
Estimates only. Measure the actual walls and confirm quantities with your supplier or installer.