Cat 5e vs. Cat 6 vs. Cat 6a: Which Ethernet Cable Do You Actually Need?

The differences are real, but for most home installs, one category clearly makes the most sense.

Ethernet cable is sold in "categories," each rated for a different maximum speed and distance. Walk into a hardware store or shop online and you'll see Cat 5e, Cat 6, and Cat 6a, usually with Cat 6a costing noticeably more. Here's what the difference actually buys you.

What each category actually supports

• Cat 5e supports gigabit speeds (1,000 Mbps) up to 100 meters. It's an older standard, still functional for basic internet use, but it's the minimum you'd want to consider today, not a forward-looking choice.
• Cat 6 also supports gigabit speeds reliably at full distance, and can support higher speeds (up to 10 Gbps) over shorter runs — roughly 55 meters or less. This is the sweet spot for most home installations right now.
• Cat 6a supports 10 Gbps at the full 100-meter distance, with better shielding against interference. It costs more and is thicker, stiffer cable that's harder to run through tight spaces, but it's fully future-proofed for speeds well beyond what most home internet plans currently offer.

Does it actually matter for your internet speed?

Here's the part that surprises people: for most home internet plans, even Cat 5e is more than enough. Most residential internet service is well under a gigabit, and even gigabit plans are fully supported by Cat 5e or Cat 6 at typical home distances. The cable category becomes the limiting factor only in scenarios involving very high local network speeds — transferring large files between a computer and a NAS at full speed, for example — not for internet browsing or streaming.

So why would you pay more for Cat 6 or 6a?

Because Ethernet cable, once it's run inside your walls, is genuinely a pain to replace. The cost difference between cable categories is small relative to the labor involved in running it. Paying a bit more upfront for Cat 6 (or Cat 6a in a business or high-performance setting) means you won't be limited by the cable itself if your internet speeds increase or your local network needs grow in the next five to ten years.

The practical recommendation

For most home installations — wiring a home office, a TV, a gaming PC, or a security camera — solid-copper Cat 6 hits the right balance: full gigabit performance at any reasonable home distance, meaningful headroom for the future, and a manageable cost and cable thickness for running through walls. Cat 6a is worth the extra cost for a small business, a home with unusually long cable runs, or anyone who specifically anticipates needing 10 Gbps speeds on their local network. Cat 5e is fine for a quick, low-cost, temporary run, but isn't what you'd want to commit to inside a wall.

One thing that matters more than the category

Solid-copper cable versus copper-clad aluminum (CCA) makes a bigger practical difference than most people realize — and it's not marked as clearly on the box. CCA cable is cheaper, doesn't carry Power over Ethernet as reliably, and doesn't meet the same fire-safety codes as solid copper in many jurisdictions. Checking for "solid copper" specifically, regardless of which category you choose, matters at least as much as the category number itself.