Fence Materials Calculator

Fence style:

Choosing a style loads its planning spacing, footing, and waste values. You can edit them afterward.

Total fence run:

Finished fence height:

Maximum post spacing: {{ formatNumber(spacing_value, 2) }} {{ spacing_unit }}

Exact value and unit

Direction changes:

Use 0 for one straight run.

Gate openings:

Opening width per gate:

Waste allowance:{{ formatNumber(waste_percent, 1) }}%

Post-hole diameter:

Post-hole depth:

Concrete yield per bag:

Optional USD prices add a material-only subtotal. Zero leaves the takeoff quantities and guidance unchanged.

Price per post:

Price per primary infill unit:

Price per rail or top-rail piece:

Price per concrete bag:

Price per gate hardware kit:

Fence material takeoff with base quantity, order quantity, optional cost, and estimating basis.
Material	Base	Order	Estimated cost	Basis	Copy
{{ row.component }}	{{ formatWhole(row.base) }} {{ row.unit }}	{{ formatWhole(row.order) }} {{ row.unit }}	{{ row.cost > 0 ? formatCurrency(row.cost) : 'Not priced' }}	{{ row.note }}

A reliable fence takeoff starts with the line the fence will actually follow. The measured run includes gate openings, while ordinary infill covers only the distance left after those openings are removed. Corners and returns matter separately because every change of direction usually needs another structural post.

Post spacing turns that line into buildable sections. A stated maximum is a ceiling, not a promise that every bay will equal that distance. Dividing a 29 m infill run into 13 sections, for example, produces an average bay of about 2.23 m when the maximum is 2.4 m. Rounding down to 12 sections would exceed the limit.

Total run: The full measured fence line, including gate openings.
Infill run: The part covered by pickets, boards, panels, mesh, or rails after gate widths are removed.
Section: One span between adjacent line posts. Whole-section rounding controls the post count and actual average spacing.
Waste allowance: Extra whole pieces for cuts, overlap, damage, pattern matching, and returns. It is applied to infill and related fittings, not to posts or concrete bags.

Fence style changes the counting unit. Wood systems are estimated as individual boards or pickets plus backer rails and fasteners. Prebuilt systems use whole panels and bracket sets. Chain link uses supplier-length mesh rolls and top-rail pieces, while split rail is counted by rails per section. A mixed list built from the wrong style can look precise and still be unusable.

Footing quantities are another first-pass estimate. Hole diameter and depth determine cylindrical volume, then a bounded post displacement is subtracted. Gate posts receive 20% more modeled concrete than ordinary line posts. Soil, frost depth, drainage, wind exposure, fence height, post material, and local rules can all require a different footing.

Before buying materials, confirm the property line, gate clear widths, grade changes, supplier dimensions, and local permit or utility-locate requirements. A takeoff can organize an order, but it cannot determine structural adequacy or show where buried services are safe to cross.

How to Use This Tool:

Measure the proposed fence line before choosing material assumptions. Keep every length tied to the unit shown beside it.

Choose Fence style, then enter Total fence run and Finished fence height. The style supplies editable planning values for spacing, waste, and footing size.
Set Maximum post spacing, count Direction changes, and enter the number and average width of Gate openings. Gate widths must total less than the full run.
Match Waste allowance, Post-hole diameter, Post-hole depth, and Concrete yield per bag to the products and site. Use the mixed yield printed on the bag, not its dry package volume.
Open Fence material takeoff and check base versus order quantities. Add optional unit prices only for a simple USD material subtotal, then use Post spacing impact to compare whole-section alternatives.

Interpreting Results:

Order quantity is the procurement figure for infill, rails, fittings, and fasteners after waste and whole-piece rounding. Posts, concrete bags, and gate kits are already whole counts and do not receive the waste percentage.

Check Actual spacing against the selected maximum. It should be equal to or smaller than that limit.
Treat Concrete bags as a volume estimate tied to the entered hole size, post profile, and bag yield.
Use the material subtotal for comparison only. It excludes labor, delivery, taxes, tools, demolition, grading, finishes, and unpriced fittings.

Technical Details:

The calculation converts all lengths to metres and bag yield to cubic metres before laying out sections. Counts are rounded upward only when a fraction of a section, supplier piece, fitting, or bag cannot be ordered.

Formula Core:

Gate openings are removed from the infill run first. The remaining length is divided into enough whole sections to keep average spacing within the chosen maximum.

\begin{aligned} L_{i} & = L_{r} - n_{g} w_{g} \\ N_{s} & = ⌈ \frac{L_{i}}{s_{\max}} ⌉ \\ N_{p} & = N_{s} + 1 + n_{c} + 2 n_{g} \\ s_{actual} & = \frac{L_{i}}{N_{s}} \end{aligned}

Here, L_r is total run, L_i is infill run, n_g is gate count, w_g is width per gate, s_max is maximum post spacing, and n_c is the number of direction changes. Total posts N_p include two gate posts per opening.

For concrete, each hole is a cylinder. A square post displacement is capped at 85% of the hole volume so the modeled concrete cannot become negative. Gate-post concrete is multiplied by 1.2.

\begin{aligned} V_{h} & = π {(\frac{d}{2})}^{2} h \\ V_{v} & = \min (0.85 V_{h}, a^{2} h) \\ V_{c} & = (N_{line} + 1.2 N_{gate}) (V_{h} - V_{v}) \\ N_{bags} & = ⌈ \frac{V_{c}}{y} ⌉ \end{aligned}

d is hole diameter, h is hole depth, a is the style's square post-face assumption, and y is mixed concrete yield per bag. Volumes use cubic metres internally.

Rule Core:

Fence style assumptions used for material counts
Style	Spacing preset	Waste preset	Primary counting rule
Wood privacy	2.4 m	10%	140 mm picket plus 6 mm gap; three backer rails per section
Shadowbox	2.4 m	15%	140 mm board plus 25 mm gap, multiplied by 1.9 faces; three rails per section
Vinyl or prebuilt panel	2.4 m	8%	Whole 2.4 m panels; two bracket sets per base panel
Chain link	3 m	5%	Whole 15 m mesh rolls and 3 m top rails; ties every 0.45 m plus three per post
Split rail	3 m	7%	Three rails per section

Waste is applied as $⌈ q (1 + w / 100) ⌉$ to each eligible base quantity. Costs multiply order quantities by the entered USD unit prices and are not rounded into a market quote.

Accuracy and Safety Notes:

The style presets are planning assumptions, not engineering specifications. Confirm post spacing, embedment, footing diameter, wind loading, and hardware with the system supplier and local authority.
Measure slopes and stepped runs along the installed line. A flat plan distance can understate material on steep ground.
Locate buried utilities before digging. Also confirm boundaries, easements, setbacks, permits, and neighbor obligations for the property.
Boards, panels, rails, mesh, and bags are sold in regional sizes. Replace every preset that differs from the actual product.

Worked Example:

A 30 m privacy fence with one gate

A 30 m run with one 1 m gate leaves 29 m of infill. With a 2.4 m maximum spacing and two direction changes, the layout needs 13 sections, 16 line posts, two gate posts, and an actual average spacing of about 2.23 m. Using 250 mm diameter holes, 0.75 m depth, and 13 L bag yield gives about 0.566 m³ of modeled concrete, rounded up to 44 bags. The 10% waste setting increases 199 base pickets to an order quantity of 219.

References:

811 in Your State, Common Ground Alliance.
Guide for the Use of the International System of Units (SI), National Institute of Standards and Technology.
Fences for the Farm, University of Georgia Cooperative Extension, reviewed March 12, 2024.