Fence materials calculator

Estimate outputs: Fence sections, Fence posts, Horizontal rails, Fence boards or pickets, Concrete for post holes. Adjust Fence length, Height, Maximum post spacing to match your project.

Inputs and units

Use the units shown beside each field. Replace the sample values with your measurements and the figures on the selected product packaging.

Parameter	Example input
Fence length	30 m
Height	1.8 m
Maximum post spacing	2.5 m
Board face width	10 cm
Rails per section	2
Hole diameter	30 cm
Hole depth	80 cm
Post diameter	10 cm
Waste allowance	8 %

Formula and assumptions

Fence sections
ceil(Fence length / Maximum post spacing)

Fence posts
Fence sections + 1

Horizontal rails
ceil(Fence sections × Rails per section × (1 + Waste allowance / 100))

Fence boards or pickets
ceil(Fence length × (1 + Waste allowance / 100) / (Board face width / 100))

Concrete for post holes
π × max(0, (Hole diameter / 200)² - (Post diameter / 200)²) × Hole depth / 100 × Fence posts × (1 + Waste allowance / 100)

ceil = round up; floor = round down; max = the greater value. Trigonometric angles are converted from degrees to radians.

Allowance is applied before rounding to whole packages. Whole units are rounded up; displayed decimals are rounded only for readability.

Project lists use simplified rectangular geometry. They do not include every fixing, fitting, accessory or labor cost.

Worked example

Sample values are examples, not product specifications. Run the calculation again with your own measurements.

Result	Calculation
Fence sections	12
Fence posts	13
Horizontal rails	26
Fence boards or pickets	324
Concrete for post holes	0.7057 m³

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