If you are shopping for a wire mesh fence in North America, chances are you’re going to be given at least some of the information about your fence in gauge. Many parts of the world use diameter in millimeters or even inches, but in North American fencing, gauge is very common—particularly for chain link fences around residences, commercial properties, and industrial sites in places like Phoenix.
This means you might be wondering how to determine wire gauge in fencing at some point. Here’s what you need to know.
First, Measure the Diameter
If you want to learn how to determine wire gauge in fencing, the first step is measuring the diameter of the wire itself.
Wire gauges correspond directly to specific wire diameters. Once you know that diameter, you can consult a wire gauge chart to pinpoint the gauge. The only time this might not apply is if you’re referencing wire from outside North America. In many metric-based regions, wire sizes are simply listed by diameter in millimeters (such as 2.5 mm or 3.15 mm).
The quickest, most accurate way to measure the diameter of fencing wire is with a vernier caliper, like the one shown below. These tools take precise diameter measurements in seconds, and they’re especially handy if you work with multiple fence types or materials.
| Wire gauges correspond directly to specific wire diameters, so once you know the diameter, a chart can do the rest of the work. In Phoenix, many chain link fence installers rely on calipers to verify that the wire gauge meets local requirements and project specs. |
 Buy a vernier caliper on Amazon |
Look It Up on a Wire Gauge Chart
Once you know the diameter of the wire, you can compare your reading to a wire gauge chart like this one, which covers some popular wire gauges in North America (common in chain link fencing):
| Gauge | Diameter in Inches | Diameter in MM |
| 6 | 0.192 | 4.877 |
| 9 | 0.1483 | 3.767 |
| 11 | 0.1205 | 3.061 |
| 12 | 0.1055 | 2.68 |
Use a Wire Gauge Tool
| If you don’t want to measure and look up wire thickness every single time, consider investing in a wire gauge measurement tool. Many of these tool’s measure both sheet thickness and wire gauge, and they’re very straightforward to use.Simply slip the gauge tool over the wire or sheet until you find the best fit and read off the correct gauge. This saves time when you need to quickly confirm whether an existing fence wire matches a specified gauge. |   Buy a wire gauge measuring tool on Amazon |
When In Doubt, Size Up
As you can see from the fencing wire gauge chart, wire sizes from other parts of the world often don’t match exactly with North American gauges. When there’s confusion between a project’s specified gauge and the wire or mesh you have on hand, it’s safest to go one size thicker (a lower gauge number).
Choosing to size up ensures you meet or exceed strength and durability requirements. That can be especially important in the desert climate around Phoenix, where occasional high winds and sun exposure can wear down lighter gauges more quickly. You still might choose the size just below the specification as an alternative, but if there’s any doubt, bigger is safer.
Ideally, however, you should purchase wire or mesh from a reputable local supplier. Different regions have different specs, and even Canada’s fencing standards can vary slightly from those in the U.S. Working with a local Phoenix-area or Arizona-based fence professional means you’ll get materials that align with the region’s standards and environmental conditions.
A knowledgeable fence contractor can also help you find exactly the right gauge or diameter for your specific needs. In many cases, your fence installer will handle the entire process, so you won’t need to learn how to determine wire gauge in fencing on your own.
If you need professional advice on gauge selection, especially for chain link fence installations, consider consulting a local contractor who understands the demands of Arizona’s climate.
Western Fence Co. has extensive experience with chain link and other wire fencing solutions in the Phoenix area, including choosing the proper gauge for your property’s needs. If you’re looking for chain link fence installation, learn more about our Phoenix chain link fence services.