Outdoor & Landscaping

Fence Calculator – Estimate Posts, Panels & Materials

Estimate common fence materials from total fence length, gate openings, section spacing, and a practical waste allowance.

Calculate fence materials

Estimate a panel fence or a wood picket fence from total run length.

Results

Gate openings are subtracted from the material run before sections are counted.

Usable fence length

96 ft

4 ft of gate openings

Fence sections

12

14 installed posts with shared gate boundaries

Panels to buy

14

12 net panels before waste

Concrete bags

14

Simple one-bag-per-post planning estimate

Estimated material cost

$1,468.00

How to measure for a fence

Measure the total planned fence run along the ground, then subtract known gate openings. For a panel fence, use the actual panel width. For a picket fence, use the planned post spacing and picket gap.

Calculation method

Panel mode counts one section per panel width. Picket mode counts sections from post spacing and then estimates pickets by dividing the usable fence length by picket width plus gap. The post model assumes one continuous straight fence run where panels and gates share boundary posts.

Usable length = total fence length - gate openings
Sections = ceiling(usable length / section width)
Installed posts = installed panel sections + gate count + 1
Pickets = ceiling(usable length / (picket width + gap))

Worked example

A 100 ft fence with one 4 ft gate leaves 96 ft of usable fence. With 8 ft panels, that is 12 installed panels plus one gate bay. In a single straight run, those 13 installed bays need 14 installed posts. With a 10% allowance, the panel purchase quantity rounds up to 14 panels, but spare panels do not increase the installed post count.

Assumptions

  • The post count assumes one continuous straight fence run.
  • Concrete is estimated as one 80-lb bag equivalent per post.
  • Waste applies to panels, pickets, and rails, not gates or posts.
  • Complex corners, separate fence runs, terminal posts, brace posts, slope details, and local installation requirements may change quantities.

Planning guidance

Mark gates, corners, and property boundaries before buying materials. Confirm local setback rules and utility marking requirements before digging post holes.

FAQs

Does this replace a fence layout plan?

No. It estimates shopping quantities from a simple run length. Corners, slopes, stepped panels, property lines, and local rules still need project-specific review.

Are gate posts included?

For one continuous straight run, the calculator treats panels and gates as bays that share boundary posts. Separate runs, corners, terminal posts, and specific gate hardware can change the count.

Why is concrete shown as one bag per post?

It is a simple planning shortcut based on an 80-lb bag equivalent. Actual hole diameter, depth, frost depth, soil, and post size can change concrete needs.