Skirting Board Calculator
Metres of skirting and number of lengths needed for a room, allowing for doorways.
Results
Pieces
8
Length
16.20
m
Length
17.82
m
Perimeter
18.00
m
What this tool does
The perimeter is the easy part; the waste allowance is what stops you going back to the shop. Mitred corners and short returns eat material, and the pieces come in fixed lengths, so buying the exact metreage is almost always a length short.
Formula
length = perimeter − openings ; pieces = length ÷ piece length
Variables
| Symbol | Meaning | Unit |
|---|---|---|
l | Length | m |
w | Width | m |
dw | Door width | m |
nd | Number of doorways | — |
pl | Length per piece | m |
ws | Waste allowance | % |
N | Pieces | — |
LT | Length | m |
LW | Length | m |
PE | Perimeter | m |
Worked example
- Length5 m
- Width4 m
- Door width0.9 m
- Number of doorways2
- Length per piece2.4 m
- Waste allowance10 %
- Pieces8
- Length16.20 m
- Length17.82 m
- Perimeter18.00 m
Limitations
- The result is an estimate based only on the values you type. Real situations often include factors this calculator does not know about.
- The calculation runs at full precision and only the display is rounded. If you copy an intermediate value and retype it, small differences can appear.