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Fence Calculator

Linear feet of fence calculator

Add up every straight segment, gate span and slope run into one total linear footage for your fence material take-off.

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Overview

Fencing is bought and counted in linear feet, the sum of every straight section of the fence line from property corner to property corner. This calculator asks for each straight segment and the gate width, adds the segments together and subtracts the gate openings, which is exactly the number your material take-off needs.

Measuring linear feet is a job for a tape measure, or a map tool if the run is long, because the take-off is only as honest as the line you measure around the yard.

Assumptions

  • The total is the plain sum of every straight segment entered.
  • Gate widths are subtracted from the linear total when entered.
  • Sloped runs use the slope-adjusted length from the fence slope calculator, not the horizontal distance.

Common mistakes

  • Counting an L-shaped or curved property edge as one segment, when every straight stretch is a separate line that needs its own measurement.
  • Leaving gate spans in the total, which over-buys fence for an opening that will not be filled with panel.
  • Squaring the footage out of habit, when fencing is a linear product and only the outline of the run matters.

Fence calculation formulas

The same math the calculator runs, in plain terms. Nothing here is a black box.

  • Sections

    sections = max(ceil(effective run / post spacing), 1)

  • Post count

    posts = (sections + 1) along the run, minus named corner and end posts already placed, plus 2 gate posts per gate

  • Effective run

    effective run = total length - sum of gate widths

  • Rail count

    total rails = sections x rails per section

  • Picket count

    pickets = ceil(run in inches / (picket width + gap)); total = ceil(raw x (1 + waste %))

  • Board-on-board pitch

    pitch = picket width - 1 in overlap

  • Panel count

    full panels = floor(run / panel width); add 1 cut panel if the remainder is over 0.01 ft; total = ceil(raw x (1 + waste %))

  • Concrete volume

    per-hole = pi x (diameter / 2)^2 x depth; total = per-hole x posts; bags = ceil(total / bag yield)

  • Slope-adjusted run

    slope run = effective run / cos(atan(slope % / 100)); shown alongside, counts use the flat run

  • Cost

    materials = (posts x post price + rails x rail price + infill x unit price + 60 lb bags x bag price) x regional multiplier; labor = effective run x labor per ft x terrain multiplier x regional multiplier; installed total = materials + gate hardware + removal + permit + labor

Every number the calculator shows comes from these formulas applied to your inputs.

In-depth guides

Buying guide

A linear feet of fence calculator exists because every material list in fencing starts from one number, the run of the line, not the area it encloses. Posts, rails, pickets, panels and hardware are all counted off that single footage, before height or style ever enters the picture. The arithmetic is additive rather than geometric: walk the property line, note where it turns a corner, and add each straight stretch to the next. A yard with four corners has four segments to measure and sum, and a yard with a jog around a shed or a dogleg along a creek just has more of them, each one still measured and added the same way regardless of how many turns the boundary makes. There is no shortcut that skips measuring each straight run, because a diagonal or curved boundary is longer than the straight-line distance between its endpoints would suggest, and guessing at it tends to under-order material, which on a delivered pallet of panels or a bundled picket order is a slower and more expensive fix than measuring carefully the first time. Once the segments are added, any gate openings come out of the total, since a gate is a measured, framed opening rather than a run of panel or picket, and material should not be bought to fill a hole that a gate will occupy.

Measuring is a tape-and-stakes job for a small yard, and a satellite map with a measuring tool for a long or irregular boundary where walking every foot with a tape is impractical. Either way the segments get entered the same way: one number per straight run. A graded yard adds a wrinkle, because a fence that follows a slope is physically longer than the horizontal distance the tape reads on a flat map. The fence slope calculator converts a horizontal run and a grade percentage into the actual built length, and that adjusted figure, not the flat-ground number, is what belongs in the linear feet total for a sloped section. The guide on how to measure your yard for a fence walks through the full process, including where to start the tape at a property corner and how to handle an irregular lot line without a survey.

Linear feet is also where a wood take-off starts once the run is known. The guide on how many posts for a fence walks the run into post count once a spacing is chosen, and from there the fence rail calculator turns the same footage, now split into post-to-post sections, into a rail count by height and style. None of that math works without the linear total being right first, which is why this calculator is usually the first stop before the wood, picket or panel calculators that follow it, and why rounding it loosely tends to compound: a yard measured a few feet short shows up as a short rail order downstream. Pricing follows the same chain. The fence cost calculator takes a linear foot total and a cost per foot and returns a budget figure, so an accurate linear count upstream is also an accurate budget estimate downstream, while a padded or guessed total turns into a padded or wrong quote.

Linear feet is frequently confused with square feet and with perimeter, and the three measure different things. Square feet multiply length by height and describe an area, relevant for paint or stain coverage, not for how much fence material to buy. Perimeter and linear feet coincide for a simple rectangular lot, which is exactly the case the fence perimeter calculator handles directly from length and width rather than segment by segment, but they diverge once a lot has an irregular boundary, at which point segment-by-segment linear measurement is the correct tool and perimeter formulas understate the real run. A related conversion problem shows up when all that is known is the lot size in acres rather than its shape: the acreage to fence length calculator gives a square-lot estimate from acreage alone, useful for early budgeting before a boundary survey exists, with this calculator as the follow-up once the real sides are measured. For documentation on where the line itself is allowed to sit, the property line and setback guide covers easements and setbacks that affect where a boundary run can be measured from, and the fence materials guide covers how a given linear footage translates into material quantities across wood, vinyl, metal and composite systems. The full set of measurement tools, including the slope, perimeter and acreage calculators referenced above, is collected on the measurement calculators hub. A last practical note: when a run crosses both flat and sloped ground, measure and total each portion separately rather than applying one blanket adjustment to the whole line, since a single average slope figure tends to either overstate the flat stretches or understate the graded ones, and the segment-by-segment habit this calculator already asks for makes that split straightforward rather than an extra step.

Frequently asked questions

How do you calculate linear feet of fence?

Measure and add every straight segment of the fence line in feet, then subtract the gate openings from the total. That sum is the linear footage your material calculator divides into posts, rails and pickets.

What is the formula for linear feet?

Add the length of every straight segment on the property line together (L1 plus L2 plus L3, and so on), then subtract the total width of the gates you are leaving open. The result is the fence run in linear feet.

How do I measure a fence line without walking the whole yard?

Measure each straight segment with a fiberglass tape on short runs, or use a map or satellite tool with a measuring line for long or irregular property lines, adding the segment measurements exactly as the calculator asks.

Does fence height change the linear footage?

No, linear feet are independent of height. Height only changes how many boards, rails or panel rows that footage costs, which the full wood and panel calculators fold in from the height and style you pick.

Is linear feet the same as square feet?

No. Square feet multiply length by height for a solid area (paint, stain or solid infill), while linear feet count only the run along the ground. A 100 foot by 6 foot fence is 600 square feet of area but 100 linear feet of run.

Does a curved fence need more linear feet?

Yes within limits: the line actually built is longer than the chord that spans it, and steep slopes add real length too. The slope adjustment is trigonometry, not a flat markup: a 100 foot horizontal run on a 25 percent grade builds to about 103 feet, which is what the fence slope calculator returns for any run and grade pair.

Should I subtract the house wall from the total?

Usually yes. Where fencing returns to the house or another building, the wall does not need a panel, so the linear total should not count across a full house-width gap. Enter only the ground between posts when measuring.

How accurate does the measurement need to be?

Material is bought to the foot, so measure to the nearest foot or so and let the calculator add the waste factor at the end rather than over-inflating segments. Better to round the take-off up by a panel than to pad every segment and double-cover the run.