Linear Feet Calculator
Perimeter mode uses 2 × (length + width). Sum mode adds up to four lengths. Same unit across fields. Estimate only, not a permit, code check, or engineered design.
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How to estimate linear feet
- Choose rectangle perimeter or sum of lengths.
- For perimeter, enter length and width in the same unit.
- For sum, enter up to four lengths. Length 1 is required. Others may be zero.
- Read total linear feet. Waste and corners for products stay on you.
Linear feet total
Perimeter or length sum
| Perimeter | 2 × (length + width) |
|---|---|
| Sum | a + b + c + d |
| Required sum term | Length 1 (a) must be greater than 0 |
| Optional sum terms | b, c, and d may be zero |
| Unit rule | Keep one unit across every field |
| Omitted | Product waste, miters, and overlaps |
What this linear feet page covers
Perimeter sketches a rectangle outline. Sum adds freeform runs. Fence post spacing sits on fencing. Board volume sits on board feet. Deck boards sit on deck flooring.
How linear feet are computed
Perimeter: 2 × (length + width). Sum: a + b + c + d with a required and b, c, d allowed at zero. The engine does not convert feet to inches.
Trim, baseboard, and pipe runs
Baseboard often follows room perimeter minus door openings you subtract yourself. Pipe and conduit runs fit sum mode. Feet and inches pair math sits on feet and inches.
Use cases
A 20 by 12 room perimeter. Summing four wall segments for crown. Not a cut list with kerf.
Limits
No automatic door subtraction and no waste percent. Estimate only, not a permit, code check, or engineered design. Nothing is uploaded.