Fence Calculator

Decks & Fences

Fence Calculator

Estimate fence posts, sections, rails and pickets from total fence length and spacing.

Fence Details

Fence Material Estimate
15 posts
For approximately 13 sections
Fence Sections13
Rails39
Pickets207
Gate Openings1
Corner, end and gate posts can require different hardware or stronger posts. Treat this as a planning estimate.

How Many Fence Posts Do I Need?

The calculator divides the total fence length by the planned post spacing to estimate the number of fence sections. A straight fence run generally uses one more post than the number of sections.

Fence Post Calculation

For a basic straight run:

Sections = Fence Length ÷ Post Spacing

Posts = Sections + 1

Gate openings and corners can require additional posts.

Layout before digging: Mark corners, gates and property boundaries before calculating the final post count.

How the Picket Calculation Works

The calculator adds the picket width and the planned gap, then determines how many repeating units fit along the total fence length.

Example

A 100 ft fence with posts spaced approximately 8 ft apart requires about 13 sections. A straight run therefore needs about 14 posts before accounting for gate requirements.

Rails and Gates

The rail estimate multiplies the number of sections by the number of rails per section. Different fence designs may use two, three or more horizontal rails.

Frequently Asked Questions

Is 8 ft post spacing always correct?

No. Proper spacing depends on fence material, height, wind exposure and the manufacturer's or engineer's requirements.

Does this include concrete for posts?

No. Post-hole size and concrete requirements depend on post dimensions, soil, frost depth and local requirements.

Do gate posts need to be stronger?

Often yes. Gate posts may carry additional load and may require larger posts, deeper footings or extra reinforcement.

Planning estimate: Verify property boundaries, utility locations, post depth and applicable local requirements before construction.

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