Fence Calculator

Estimate straight-run fence sections, end posts, panels, rails and concrete bags from spacing and your own per-post concrete allowance. Calculate it clearly with Figur.

Count fence sections and add the closing post

Sections = fence length ÷ post spacing in feet, rounded up. Posts = sections + 1; panels = sections. Total rails = sections × rails per section. Concrete bags = posts × bags per post. Rails per section and bags per post are rounded to whole numbers with a minimum of 1. Concrete is an entered allowance, not calculated from hole diameter, depth or bag yield.

Method and assumptions

Sections = round up(length ÷ post spacing); posts = sections + 1; panels = sections. Rails = sections × rails per section; bags = posts × bags per post.

  • One straight, open run is assumed, with a post at each end. A partial final section still counts as one panel.
  • Enter 1 to 6 whole rails per section and 1 to 10 whole bags per post. There is no separate waste percentage.
  • Bag size and concrete yield are not inputs. Choose bags per post using actual hole dimensions and the product label.
  • Gates, corners, closed-loop post sharing, slope breaks, pickets, fasteners, excavation and local post-depth requirements are excluded.

Planning takeoff, not a binding bid, structural design or engineering advice. Confirm field measurements, product coverage, installation requirements and supplier quantities before buying.

Sources and references

The result uses your inputs and the tool's documented assumptions; it does not fetch current prices, rates or products.

Worked example

A 201 ft straight fence has posts at up to 8 ft spacing, 3 rails per section and 2 concrete bags per post.

201 ÷ 8 = 25.125, rounded up to 26 sections and 26 panels. Add 1 closing post for 27 posts. Rails: 26 × 3 = 78; concrete: 27 × 2 = 54 bags.

Frequently asked questions

Why is there one more post than panels?

A straight run needs a post at each end. Each panel shares its interior posts with neighbors, so sections plus one gives posts.

Does it calculate concrete volume?

No. It multiplies posts by your bags-per-post allowance. Confirm bag size, yield, hole diameter and depth independently.

Can I use the total for a closed fence or gates?

Not without adjustments. Closed loops share end posts, while gates, corners and slope changes can need additional posts and hardware.

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