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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

  1. Choose rectangle perimeter or sum of lengths.
  2. For perimeter, enter length and width in the same unit.
  3. For sum, enter up to four lengths. Length 1 is required. Others may be zero.
  4. Read total linear feet. Waste and corners for products stay on you.

Linear feet total

Perimeter or length sum

Perimeter2 × (length + width)
Suma + b + c + d
Required sum termLength 1 (a) must be greater than 0
Optional sum termsb, c, and d may be zero
Unit ruleKeep one unit across every field
OmittedProduct 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.

Linear feet questions

What is perimeter mode?
2 × (length + width) for a rectangle outline.
How many lengths can sum mode take?
Up to four. Length 1 is required. The others may be zero.
Does this convert inches to feet?
No. Keep one unit, or convert first on the feet and inches page.
Is waste included?
No. Add waste yourself for trim and molding.
Where do I count fence panels?
Use the fencing calculator.
Is this engineered design?
No. It is an estimate only, not a permit, code check, or engineered design.