How to Measure Your Fence Line

Step-by-step guide to measuring perimeter, accounting for slopes, and marking corners.

Accurate measurement is the foundation of any fence project. Get this wrong and you'll order too much (wasting money) or too little (delaying the build).

Tools You'll Need

100 ft tape measure or measuring wheel
Stakes and string
Notepad and calculator
Property survey (if available)

Step 1: Mark Your Corners

Drive a stake at every corner of your planned fence line. Verify property lines using your survey or a professional locator.

Step 2: Run String Between Stakes

This gives you a straight reference line and reveals slope or obstacles.

Step 3: Measure Each Run

Walk each segment with a measuring wheel. Record each run separately so you can plan post spacing properly.

Step 4: Account for Slope

On steep terrain, follow-the-grade installs need more material than racked panels. Add 5–10% extra.

Use our Linear Footage Calculator to total your runs and the Post Spacing Calculator to plan post locations. Related: measuring blog post.

❓ Frequently asked questions

How do I calculate how much fence I need?

Walk each straight run separately with a measuring wheel and write the runs down individually rather than as one total. Add them for your linear footage, then subtract every gate opening, because a gate is a built frame rather than a run of fence. Keeping the runs separate is what lets you plan post spacing so a section does not end in an awkward 2 ft stub.

Should I measure along the ground or level on a slope?

Measure along the ground. That is the distance the fence actually has to cover, and it is longer than the level distance across the same span. On anything steeper than a gentle grade, add 5 to 10 percent to your material order — a stepped fence needs taller posts and a racked one needs longer rails.

How accurate does a fence measurement need to be?

Within a foot over a typical run is fine for ordering, because the waste allowance absorbs it. What is not fine is being wrong about where the property line is. Check your survey or have the line located before you set a single post; moving a finished fence is far more expensive than the survey.

Do I measure to the property line or inside it?

Most jurisdictions require a setback from the line, and many people deliberately build a few inches inside it so every part of the fence, including the footings and the post caps, is on their own land. Check your local setback rule first — it is the single most common reason a fence has to be moved.

What tools do I need to measure a fence line?

A measuring wheel for the runs, stakes and mason string to mark straight lines and reveal slope, and a notepad. A 100 ft tape works but is slow and sags over long runs. A laser measure is quick on clear ground and useless once there is grass, a slope or a shrub in the way.

How to Measure Your Fence Line

Tools You'll Need

Step 1: Mark Your Corners

Step 2: Run String Between Stakes

Step 3: Measure Each Run

Step 4: Account for Slope

❓ Frequently asked questions

How do I calculate how much fence I need?

Should I measure along the ground or level on a slope?

How accurate does a fence measurement need to be?

Do I measure to the property line or inside it?

What tools do I need to measure a fence line?

📬 Free Fencing Cost Guide

🔧 Recommended Fencing Tools & Supplies

SKIL 15 Amp 7-1/4 Inch Circular Saw with Single Beam Laser Guide - 5280-01

DEWALT 20V MAX Circular Saw Cordless, Battery Not Included (DCS391B)

DEWALT 20V MAX XR Brushless Cordless 7-1/4 in. Circular Saw, Tool Only (DCS590B)

Extbtfor Cordless Circular Saw,2.0 Battery 3400RPM Laser Guide,45° Angle | 4-1/2" Mini Circular Saw Maximum Cutting 1-11/16" at 90° and 1-1/8"at 45° for Wood, Soft Metal, Plastic

Romeda Mason Line #18, 500 Ft Orange String, Construction Twine for Gardening & Masonry

Irwin Tools 1794482 Magnetic Post Level