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Rectangular Fence Length with Optional Gate Opening

Rectangular Fence Length with Optional Gate Opening. Use retained unit controls, geometric inverse relationships and explicit planning assumptions.

Formula & worked example
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How to use this calculator

Enter the known values in the units shown. Results update as you type.
Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
Use the worked example to check the method. Reset restores the starting fields.

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Formula and method

Example in initial displayed units: Length (L) 10, Width (W) 5 gives Area (A) ".005", Fence perimeter (P) 30.

P = 2(L+W); fence without gate material = P−opening; A = LW

Worked example

Enter these known values and leave the other values blank.

Length (L): 10 m
Width (W): 5 m

Area (A): 0.005 ha
Fence perimeter (P): 30 m

Assumptions and limitations

The enclosure is rectangular and length is at least width. Gate mode subtracts one opening from the full boundary; that opening cannot exceed the long side. Material allowances, posts, corners and overlapping panels are separate from this geometric length. Initial area units are hectares.
Use compatible units and enough independent measurements. Clear unknown values before solving backward. Display precision does not quantify uncertainty in site measurements.

Common questions

Should I subtract the gate from the enclosure perimeter?

The geometric perimeter remains the full boundary. Subtract the opening only from the fencing material length; the gate still occupies part of that boundary.

References

The international acre is exactly 43560 square international feet; Bookify replaces the rounded captured area factor.

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