CalcLibrary

Fence Estimator

Estimate fence panels and posts for a straight run or a rectangular yard. Enter your own measurements, total gate width, and panel width to turn rough perimeter notes into a practical buying list.

Units
m
m
m
Examples

An 18 m straight run with one 1.2 m gate and 1.8 m panels.

Panels needed
10
Total posts
12
Net fence line
16.8 m
Gross run length
18 m
Gate width removed
1.2 m
Gate openings
1
Total sections
11
End posts
2
Shared / line posts
10

Gate openings stay separate sections in the post count, so the post total can rise even when the fence line gets shorter.

Buying estimate from your measurements only — not a permit, footing, or installer-method plan.

Was this useful?

Examples

How It Works

Formula

G={Rstraight run2(L+W)rectangular yardG = \begin{cases} R & \text{straight run} \\ 2(L + W) & \text{rectangular yard} \end{cases}

N=G−WgN = G - W_g

P=⌈NWp⌉P = \left\lceil \frac{N}{W_p} \right\rceil

S=P+gS = P + g

T={S+1straight runSrectangular yardT = \begin{cases} S + 1 & \text{straight run} \\ S & \text{rectangular yard} \end{cases}

Variables

GG

Gross fence length before gate width is removed. Straight run uses the run length; rectangular yard uses the perimeter.(active page length unit)

RR

Measured straight-run fence length.(active page length unit)

LL

Rectangular yard length.(active page length unit)

WW

Rectangular yard width.(active page length unit)

NN

Net fence line left after subtracting the combined gate width once.(active page length unit)

WgW_g

Combined gate width removed once from the gross fence length.(active page length unit)

WpW_p

Width covered by one fence panel or bay.(active page length unit)

PP

Panel count after rounding up to the next whole panel.(whole panels)

gg

Gate openings counted as separate sections.(whole openings)

SS

Total sections, including gate openings.(whole sections)

TT

Total posts. Straight runs use sections + 1; closed rectangular yards use sections.(whole posts)

Choose a straight run or rectangular yard, enter your measured dimensions, subtract the combined gate width once, divide the remaining fence line by your panel width, and round up to whole panels. Gate openings stay separate sections in the post count, so open runs use sections + 1 posts while closed rectangular layouts use sections posts.

Frequently Asked Questions

01Why are panels rounded up?
Fence panels are bought as whole sections, so any partial remainder is rounded up to the next full panel.
02What happens if total gate width is 0?
The calculator treats the layout as a no-gate fence, even if the gate count field is still above 0.
03Why might a contractor’s post count differ?
Installers do not all space panels, frame gates, or handle corners the same way. This tool follows simple section math from your dimensions only.
04Does this tell me footing depth or code requirements?
No. It is a buying estimate for panels and posts, not a permit, structural, or code-compliance plan.
05Should I add extra panels or posts?
Add any buffer yourself if you want one. This calculator does not bake in a spare-panel or extra-post allowance.

All calculators