How to Calculate Fence Length

Accurate fence length measurement is the foundation of all material estimates. Here's how to measure correctly for straight runs, corners, and gates.

Method 1: Tape Measure (Most Accurate)

For a straight run along a property line, run a tape measure along the ground from the starting post to the ending post. Record the measurement in feet. For runs longer than 100 ft, use a measuring wheel or mark every 100 ft.

Method 2: Measuring Wheel

A measuring wheel is faster for long runs. Walk along the fence line and read the counter. Measuring wheels are accurate to within 1% over 100 ft, which is sufficient for material estimation.

Method 3: Property Survey

If you have a property survey, measure the fence line on the survey map using a scale ruler. This is useful for planning before you go outside, but always verify with a physical measurement before ordering materials.

Accounting for Corners

For an L-shaped or U-shaped fence, measure each straight section separately and add them:

Section 1: 50 ft
Section 2: 30 ft (perpendicular)
Section 3: 50 ft
Total: 130 ft

Subtracting Gate Openings

Gates are installed between posts, so subtract the gate width from the total fence length before calculating panels:

Total property line: 100 ft
Gate opening: 4 ft
Fence length (for panels): 96 ft

Adding Posts at Corners

Every corner needs a post. Every gate needs 2 posts (heavier than standard posts — use 4×6 or 6×6). When calculating post count, add 1 post per corner and 2 posts per gate.

Use the Calculator

Once you have the total fence length, use the Fence Calculator to estimate posts, rails, and pickets. For post-hole concrete, use the Fence Post Calculator.