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Baseboard / Skirting Calculator
Estimate how many baseboard or skirting boards you need from room size, openings, board length, and waste allowance.
Enter your dimensions
Current unit: feet. The estimate updates automatically in your browser.
Enter the room length.
Enter the room width.
Optional. Enter the total width of doors or openings where baseboard will not be installed.
Enter the length of one baseboard or skirting board piece you plan to buy.
Optional extra allowance for cuts, miters, mistakes, and ordering margin.
Estimated result
Boards needed
Enter your inputs
Your estimate will appear here automatically once the required inputs are valid.
Guide
How to use this estimate
How the baseboard calculator works
This calculator finds the room perimeter, subtracts any openings where baseboard will not be installed, adds optional waste allowance, and divides the result by the length of one board.
The final board count is rounded up because baseboard and skirting boards are normally bought as full pieces.
What to measure
Measure the room length and width. Enter the total width of doors or other openings where baseboard will not be installed.
Enter the length of one board or skirting piece you plan to buy. Common stock lengths may vary by store and country, so use the actual product length.
Example baseboard calculation
- Room length: 12 feet
- Room width: 10 feet
- Opening width: 3 feet
- Board length: 8 feet
- Waste allowance: 10%
- Perimeter: 2 × (12 + 10) = 44 feet
- Net length: 44 - 3 = 41 feet
- Adjusted length: 41 × 1.10 = 45.1 feet
- Boards needed: 45.1 ÷ 8 = 5.6375, rounded up
Estimated baseboard needed: 6 boards.
Quick reference
| Item | Value | Note |
|---|---|---|
| Basic formula | ceil(adjusted length ÷ board length) | Adjusted length includes opening deductions and waste allowance. |
| Opening deduction | Subtracted from perimeter | Use for doors or gaps where baseboard will not be installed. |
| Result type | Boards | Board count is rounded up to full pieces. |
Common mistakes to avoid
- Forgetting to subtract door openings.
- Using total linear length as the board count.
- Forgetting to round up to full board pieces.
- Entering an opening width larger than the room perimeter by mistake.
Frequently asked questions
Why does the calculator round up?
Baseboard and skirting pieces are usually bought as full boards. If the exact calculation is 5.2 boards, you still need to buy 6 boards.
What happens if opening width is larger than the room perimeter?
The calculator floors the net length at zero so it never returns a negative baseboard length or negative board count.
Does this work for irregular rooms?
This V1 calculator is designed for rectangular rooms. For irregular rooms, measure each wall run separately and use the total linear length as a manual planning reference.