Wi-Fi vs Ethernet: How Much Speed Are You Losing?

Guide · Updated July 2026

Here's a number that surprises most people: on a typical home connection, Wi-Fi delivers anywhere from 30% to 70% of the speed you'd get over a cable — and in a far room it can be under 10%. If your speed test looks nothing like the plan you pay for, the wireless link between your device and your router is the first suspect, not your provider.

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Real-world numbers on a gigabit plan

These are typical results you'd see testing the same 1000 Mbps connection from different places in a normal home. Your exact numbers will differ, but the pattern won't:

How you're connected	Typical speed
Ethernet cable to the router	900–950 Mbps
Wi-Fi 6, same room as router	400–700 Mbps
Wi-Fi 5, same room	250–450 Mbps
Wi-Fi, one floor / two walls away	100–250 Mbps
Wi-Fi, far corner of the home (2.4 GHz)	20–80 Mbps

Ethernet loses almost nothing because it's a dedicated, interference-free wire. Wi-Fi is radio — and radio has to fight physics.

Why Wi-Fi is slower than cable

Distance and walls. Every wall between you and the router cuts signal strength. Brick, concrete and metal are far worse than drywall — more on that in our router placement guide.
Shared airtime. All Wi-Fi devices in your home share the same radio channel. Your laptop, phone, TV and smart speakers take turns transmitting — the more devices talk, the smaller each one's share.
Interference. Neighbours' networks, microwaves, baby monitors and Bluetooth all operate in the same frequency ranges and create noise your router has to work around.
The band you're on. 2.4 GHz travels further but is slow and crowded. 5 GHz (and 6 GHz on newer routers) is much faster but has shorter range. Many devices silently fall back to 2.4 GHz when the signal weakens.
Your device's radio. A cheap laptop or an older phone may only support older Wi-Fi standards, capping speed no matter how good the router is.

Latency: the difference you feel

Speed isn't the whole story. Ethernet also gives you a lower and much more stable ping. Wi-Fi typically adds 2–10 ms of latency and, more importantly, adds jitter — small random spikes that cause rubber-banding in games and frozen frames in video calls. A wired connection removes nearly all of that. If you game competitively or take important calls, this stability matters more than raw Mbps — see our guide to jitter and packet loss.

When Ethernet is worth the cable

Gaming PC or console — stable low ping beats any Wi-Fi upgrade.
Work-from-home desk — no dropped video calls, ever.
The main TV — 4K streams without a single buffer wheel.
Anything that doesn't move — if a device sits in one place near the router, there's simply no reason to leave it on Wi-Fi.

Phones, tablets and laptops that move around the house are what Wi-Fi is for. The winning setup in most homes is a hybrid: wire what stays put, keep the airwaves free for what moves.

Which Ethernet cable should you buy?

Good news: cables are cheap, and you don't need the most expensive one.

Cable	Good for
Cat5e	1 Gbps
Cat6	1–10 Gbps
Cat6a	10 Gbps
Cat7 / Cat8	Overkill at home

Cat6 is the sweet spot for a home: inexpensive, handles gigabit easily, and has headroom for faster plans later. Cat8 marketing is aimed at data centres — it won't make your internet faster than your plan allows.

Can't run a cable? Two middle-ground options

Powerline adapters send data through your electrical wiring. Real-world speeds vary a lot with the quality and layout of the wiring (often 50–300 Mbps), but they're a plug-and-play fix for one far room.
MoCA adapters use existing coaxial TV cabling and are much faster and more stable than powerline (often near-gigabit) — excellent if your home has coax outlets in the right rooms.

Measure the gap yourself

The proof is a two-minute experiment: run a speed test on Wi-Fi where you normally sit, then plug the same device in with a cable and run it again. The difference is exactly what Wi-Fi is costing you — and if the wired number is also far below your plan, then it's time to look at the router or talk to your provider.