You can make your own Ethernet cable with the right tools and about 10 minutes per cable

Building an Ethernet cable yourself costs less than buying pre-made ones and takes only a few minutes once you understand the process. You need four things: a length of cable (Cat5e or Cat6), two RJ45 connectors, a crimping tool, and a wire stripper. The actual work is straightforward — strip the outer jacket, arrange eight colored wires in the correct order, insert them into a connector, and crimp it down. Both ends need the same treatment.

This matters if you need cables longer than what stores stock, want to run cable through walls or conduit without pre-made connectors getting in the way, or straightforward want to save money on multiple cables. A 1000-foot spool of Cat6 cable costs roughly what five or six pre-made cables do, and you can make dozens from it.

Key Takeaways

  • You need a cable spool, two RJ45 connectors per cable, a crimping tool, and a wire stripper — all available at hardware stores or online for under $30 total.
  • Both Cat5e and Cat6 use the same connector type and wiring order, so the process is identical regardless of which cable type you choose.
  • The wires must follow the same color order on both ends: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown.
  • A crimping tool compresses the connector onto the wires; without it, the connection will not work and the connector cannot be reused.
  • Test the finished cable with a network tester before running it through walls, since a bad crimp will not show until you try to use it.

What tools and materials you actually need

Start with bulk cable — either Cat5e or Cat6 on a spool. Cat6 is slightly thicker and more expensive but handles longer runs better. For most home setups, Cat5e works fine. Buy only what you need; a 100-foot spool is enough for several cables with room to spare.

RJ45 connectors are the small plastic plugs that go on the ends. They cost pennies each, but buy a pack of 10 or 20 because you will waste a few while learning. Get connectors rated for your cable type — Cat5e connectors work with Cat5e cable, and Cat6 connectors work with Cat6 cable, though the difference is minor.

A crimping tool is essential and non-negotiable. It looks like a heavy-duty stapler and costs $15 to $40. Cheap ones ($8 to $12) often do not crimp evenly and will frustrate you. Mid-range tools ($20 to $30) work reliably. Do not try to use pliers or a hammer — the connector will not seat properly and the cable will not work.

A wire stripper removes the outer jacket without nicking the inner wires. A basic one costs $5 to $10. You can also use a utility knife carefully, but a stripper is faster and safer. You may also want a network cable tester ($15 to $25) to verify each cable works before you hide it in a wall.

How to strip the cable and prepare the wires

Cut your cable to length with scissors or a utility knife. Add a few extra inches — you can always trim it shorter, but you cannot add length back. Measure twice if the cable is going into a wall.

Use the wire stripper to remove about half an inch of the outer jacket from each end. Most strippers have a notch sized for Cat5e and Cat6; slide the cable in, squeeze, and rotate the stripper around the cable once. The outer jacket should separate cleanly. If it does not, you are either using the wrong notch or squeezing too hard — adjust and try again.

Inside the jacket you will find four twisted pairs of wires, each pair a different color: orange, green, blue, and brown. Each pair has one solid-colored wire and one white wire with a colored stripe. Untwist these pairs carefully and straighten all eight wires. They should lie flat and parallel, not kinked or tangled.

Arrange the wires in this exact order from left to right: white-orange, orange, white-green, blue, white-blue, green, white-brown, brown. This order is called the 568B standard and is the most common for home networks. Both ends of the cable must use the same order. Write it on a piece of tape if you need to remember it.

Inserting wires into the connector and crimping

Hold the RJ45 connector with the clip facing away from you and the open end toward you. The connector has eight tiny slots inside, numbered left to right. Insert each wire into its matching slot — white-orange goes in slot 1, orange in slot 2, and so on. Push each wire all the way in until it stops. The wires should be touching the metal contacts inside the connector.

Once all eight wires are seated, trim them so they are even and flush with the front of the connector. Any wire sticking out past the others will not make contact. Use scissors or the cutter on your wire stripper.

Place the connector into the crimping tool with the clip facing down. Squeeze the handle firmly and steadily until it stops. You will hear or feel a click. The crimper pushes a metal bar down onto the wires, forcing them onto the metal contacts inside the connector. This is what makes the electrical connection. Release the handle and remove the cable. The connector should now be permanently attached.

Repeat this process on the other end of the cable using the same wire order.

Testing your cable before installation

Before you run the cable through walls, attics, or conduit, test it with a network cable tester if you have one. Plug one end into the tester's input and the other end into the output. A working cable will light up all eight LEDs in sequence. If lights skip or do not light at all, the crimp failed — the connector is ruined and must be replaced.

If you do not have a tester, you can plug the cable into a router and a computer and see if the connection works. This is slower than a tester but will catch major problems. A cable that fails a tester will also fail in use, so do not skip this step if you are running cable behind drywall.

If a cable fails, cut off the bad connector with scissors, strip the jacket again, and crimp a new connector onto the same cable. You can do this several times on a single cable as long as you have enough length.

Common mistakes that break the cable

The most common error is mixing up the wire order between the two ends. Both ends must be identical — if one end is 568B and the other is 568A (the reverse order), the cable will not work. Write the order on tape and stick it to your work surface.

The second mistake is not pushing the wires all the way into the connector. If a wire is even slightly short, it will not touch the metal contact and that pin will not work. The cable might appear to work for one or two connections but fail randomly.

The third is using a crimper that is too weak or explore too little pressure. If the metal bar does not fully compress onto the wires, the connection will be loose and unreliable. Squeeze the crimper handle all the way until it stops, then hold it for a second.

The fourth is trimming the wires too short after stripping the jacket. If you remove more than half an inch of jacket, the unshielded wires inside the connector become exposed and can short against each other or pick up interference. Strip only what you need.

When to buy pre-made cables instead

Making cables makes sense if you need many of them, want a specific length, or plan to run cable through walls. For one or two short cables, a pre-made option from a store is faster and costs almost the same.

Pre-made cables also come with strain relief — a plastic boot around the connector that protects the wires from bending too sharply. Homemade cables can have this too if you buy separate boots, but most people skip them. If a cable will be bent repeatedly or plugged and unplugged often, a pre-made cable with strain relief lasts longer.

If you are running cable through a wall and do not want to deal with crimping, you can also buy bulk cable and have an electrician or network installer terminate the ends. This costs more than doing it yourself but less than buying multiple pre-made cables.

Frequently Asked Questions

Can I use Cat5e and Cat6 connectors interchangeably?

Physically, yes — they look the same and fit the same. Electrically, Cat6 connectors are slightly more precise and handle the higher frequencies Cat6 cable supports. For reliability, match the connector to the cable type. It costs almost nothing more.

What is the difference between 568A and 568B wiring?

They are two different wire orders. 568B (white-orange, orange, white-green, blue, white-blue, green, white-brown, brown) is more common in homes. 568A reverses the orange and green pairs. Both work fine as long as both ends of the cable use the same order. Pick one and stick with it.

Can I make a crossover cable by using different orders on each end?

Yes, but you do not need to. Modern network equipment handles straight-through cables (same order on both ends) for all connections, including computer-to-computer. Crossover cables are obsolete for home networks.

What happens if I crimp the connector wrong?

The cable will not work or will work intermittently. Cut off the bad connector, strip the jacket again, and crimp a new one. You can reuse the cable multiple times as long as you have enough length left.

Do I need to test every cable I make?

If you are running cable behind drywall or in conduit, yes — a failed cable is expensive to replace once it is hidden. For cables that stay visible and accessible, testing is less critical but still recommended.