Chain Link Fence Guide: Calculating Fabric, Posts, and Tension Wire
Introduction
Chain link fencing is priced and ordered in three separate pieces: the fabric itself (the mesh, sold by the roll), the posts that hold it up, and the tension wire that runs along the top and bottom to keep the fabric taut between posts. This guide breaks down how to calculate all three from a simple fence length measurement.
For a complete suite of fencing estimating tools, visit the fencing calculators hub .
Calculating Fabric Rolls
Chain link fabric is commonly sold in 50 ft rolls. Divide your total fence length by the roll length and round up.
Formula:
Rolls needed = Fence length ÷ Roll length (round up)
Example:
100 ft fence, 50 ft rolls.
100 ÷ 50 = 2 rolls
A partial roll still requires purchasing a full one, and seaming two partial rolls together on site adds labor most crews prefer to avoid.
For help with this calculation, use the Chain Link Fence Calculator .
Calculating Line Posts
Line posts support the fabric along a straight run and are set at regular intervals — typically spaced 8–10 feet apart.
| Application | Recommended Spacing |
|---|---|
| Standard residential | 10 ft |
| High-wind areas | 8 ft |
| Commercial / heavy-duty | 8 ft |
Formula:
Line posts = (Fence length ÷ Post spacing) + 1 (round up)
Example:
100 ft fence, 10 ft spacing.
(100 ÷ 10) + 1 = 11 line posts
Note: Terminal (end, corner, and gate) posts are counted separately from line posts.
Terminal vs. Line Posts
| Post Type | Purpose |
|---|---|
| Line posts | Support fabric along straight runs |
| Terminal posts | Corners, ends, gates — bear tension load |
A straight run needs at least 2 terminal posts (one at each end); every corner and gate adds more.
For more on post types, see the fence materials guide .
Calculating Tension Wire
Most installs run one tension wire along the bottom and one along the top (or a top rail instead), so you need roughly twice the fence length in tension wire if both top and bottom are wired.
Formula:
Tension wire = Fence length × 2
Example:
100 ft fence.
100 × 2 = 200 ft
Tension wire keeps the fabric taut between posts and prevents sagging over time.
Worked Example
The project:
100 ft fence
10 ft post spacing
50 ft rolls
Straight run with 2 terminal posts
Fabric rolls:
100 ÷ 50 = 2 rolls
Line posts:
(100 ÷ 10) + 1 = 11 line posts
Terminal posts:
2 (straight run) — add more for corners or gates
Tension wire (top + bottom):
100 × 2 = 200 ft
Common Mistakes to Avoid
Not adding terminal posts on top of the line post count for corners and gates
Forgetting that tension wire runs both top and bottom, doubling the linear footage needed
Using 10 ft post spacing in a high-wind area that would benefit from tighter 8 ft spacing
Rounding down on fabric rolls instead of up, leaving a section of fence uncovered
Important Limitations
Estimates Are Not Construction Specifications
Chain link fence requirements vary by local code, wind exposure, and application. Always verify with your supplier and local building department.
Frequently Asked Questions
How far apart should chain link fence posts be?
Line posts are typically spaced 8–10 feet apart. Closer spacing (8 ft) adds rigidity in high-wind areas.
What is the difference between a line post and a terminal post?
Line posts support the fabric along a straight run. Terminal posts are heavier-duty posts at corners, ends, and gates that bear tension load.
How much tension wire does a chain link fence need?
You need roughly twice the fence length in tension wire for top and bottom runs.
Ready to calculate your chain link fence? Use the free Chain Link Fence Calculator .
Explore More Fencing Resources
This guide covered the basics of chain link fence estimation. For a complete suite of estimating tools, visit our fencing calculators hub — where you’ll find dedicated calculators for materials, cost, post length, post concrete, chain link, vinyl panels, gate hardware, and stain coverage. Each calculator is paired with a full guide walking you through the math, common mistakes, and project-specific considerations.