One speed test next to the router tells you almost nothing. Six tests in six rooms, written down, tells you exactly which problem you have - and which to stop paying to fix.
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Run the same speed test in six places — right next to the router, then one room per direction, then the worst room — and write down the download speed and the signal reading each time. The shape of those six numbers tells you whether you have a coverage problem, a congestion problem or a plan problem, and those three have completely different fixes.
The method, in ten minutes
Pick one tool and one device. A phone and a browser-based speed test is fine. Consistency matters far more than which test you use, so do not switch halfway through.
Start beside the router. Stand within a few feet of it, test, and write the number down. This is your baseline — the best your Wi-Fi can possibly do.
Test one spot per area of the house. Each bedroom, the kitchen, the basement, the far end of the ground floor. Stand still, hold the phone at chest height, and wait for the test to finish rather than reading the peak.
Note the signal strength as well as the speed. On Android most speed-test apps show it; on iOS you can compare bars, or use a Wi-Fi survey app. The two numbers together are what make the result diagnostic — strong signal with low speed means something different from weak signal with low speed.
Repeat the worst room at a different time of day. Once in the morning, once at about 9 p.m. A number that collapses in the evening is congestion, not coverage.
Finally, test on a cable next to the router. This is the step most people skip and it is the most important one, because it separates your Wi-Fi from your internet plan.
How to read the six numbers
What you measured
What it means
What to do
Fast on a cable, fast beside the router, slow in far rooms
A coverage problem — the classic one
More radios, better placement, or a wired access point
Fast on a cable, slow even beside the router
The router is the limit, or the band is congested
Replace the router, or change channel first
Slow on a cable too
Your plan, modem or ISP — not Wi-Fi at all
Check the plan and the modem before buying anything
Fine in the morning, bad at 9 p.m.
Contention, yours or the neighborhood's
Channel change, band steering, prioritization
The four patterns these measurements produce, and what each one means you should do.
Scroll the table sideways to see every column.
The second row is worth dwelling on, because it is the pattern people most often misdiagnose. Strong signal and poor speed is not a coverage problem, and a mesh system will distribute that same poor speed to more rooms. Interference and congestion is the page for that result, and mesh versus a better router is the decision it leads to.
Try this first
Write the numbers down, on paper or in a note
The point of this exercise is the comparison, and nobody remembers six figures accurately. Keep the list — it is also how you prove afterward that whatever you bought actually helped, which is the difference between fixing the problem and buying something and hoping. Re-run the same six tests after any change.
Common mistakes that invalidate the result
Testing while someone is streaming. You will measure the leftovers. Test when the house is quiet, then separately when it is busy, and compare the two deliberately.
Walking while testing. The phone will switch bands or access points mid-test and the number becomes meaningless.
Comparing different devices. An old laptop and a new phone have different radios. Use one device for the whole survey.
Reading the peak instead of the result. Speed tests spike early. Wait for the final figure.
Testing only download. Upload matters for video calls, and it fails first in the far rooms — if your problem is dropped meetings, look at upload and at dropped video calls.
Mapping instead of measuring
If you would rather see the result as a picture than a list, a heatmap app walks the floor plan with you and shades the weak areas. It is the same measurement with better presentation, and it is genuinely useful for deciding where a second radio should go — the apps worth using covers which ones work on which platform.
Either way, test candidate positions before you commit. Put the node or extender on a chair in the proposed spot, re-run the survey, and only then mount or hide it. eero's published guidance — 20 to 30 feet between units, no more than 50 feet on a wireless link, never inside the dead zone, roughly halfway between floor and ceiling — is the best starting point, and node placement and router placement cover the detail.
What to do with the answer
One weak room: an extender with an Ethernet port, or a wired access point. Three or more weak rooms, or a whole floor: a mesh system, sized by the node-count method. Weak everywhere including beside the router: a new router, or a channel change first. Slow on a cable: stop shopping and look at your plan — why is my Wi-Fi so slow and internet fast but Wi-Fi slow both pick up from this point.
How we picked
We do not run a test lab. Rankings here are built from the manufacturers' published specifications, measurements taken by independent outlets that do have labs, and the structural reasoning on this site about what a given house or job actually needs. Every product was checked as currently sold before it was included. Where a figure appears it is attributed and linked in Sources; where we have no basis for a claim, it is left out. Our methodology sets out exactly what we will and will not assert.
Quick picks
Ranked by our published scoring rubric (fixes coverage, fixes congestion, cost, value). Tap any row to jump to the full write-up, or go straight to the retailer from the right-hand column. How we score.
#
Product
Best for
Score
Price
1
Illustrative
TP-Link RE715XAX3000 with a gigabit Ethernet port, rated for about 2,400 sq ft. The cheapest correct answer when the measurements show a single cold room rather than a cold house.
TP-Link Deco X55Three nodes with three gigabit ports each, rated to about 6,500 sq ft. When the test shows the whole far half of the house is weak, this is the right category and the cheapest entry to it.
TP-Link Archer BE550Tri-band Wi-Fi 7 with 6 GHz and 2.5 Gbps ports, measured at full gigabit-plus over wired. If the test was bad next to the router, the router is the problem and this replaces it.
Scroll the table sideways on a narrow screen. Scores are our editorial assessment from published specifications and independent testing by named outlets — not our own lab results. What we do and do not test.
The picks in full
Illustrative
#1 · If one room failed the test
TP-Link RE715X
TP-Link · Midrange
The extender to buy if you are buying an extender: AX3000 speeds, a gigabit Ethernet port, and EasyMesh so it behaves like a node rather than a second network.
Key specifications
Standard
Wi-Fi 6, AX3000
Coverage claim
About 2,400 sq ft
Ports
1 Gigabit Ethernet
Roaming
EasyMesh compatible
Score 7.9/10
Fixes coverage7.5
Fixes congestion5.0
Cost9.5
Value9.0
What it gets right
+EasyMesh support means one network name and real handoff, instead of a second SSID you have to switch to manually
+The gigabit port turns it into an access point if you can run a cable to it
+AX3000 leaves enough headroom that the halved wireless throughput is still usable
What to watch for
−EasyMesh only works if your router supports it — check before you buy
−Wireless mode still splits its radio between router and device
−Costs enough that a budget mesh three-pack becomes a fair comparison
#ad We do not publish a price we cannot verify, so the button opens Amazon's own listing. How we are funded.
Common questions
How do I test Wi-Fi speed in different rooms?+−
Use one device and one speed test, stand still in each room, and record the download speed and the signal reading. Start beside the router for a baseline, test one spot per area, re-test the worst room in the evening, and finish with a test on an Ethernet cable next to the router to separate your Wi-Fi from your internet plan.
What is a good Wi-Fi speed in a bedroom?+−
Judge it against your baseline beside the router rather than against an absolute number. Losing some speed at distance is normal; losing most of it is a coverage problem. As a practical floor, a room needs roughly 25 Mbps for comfortable 4K streaming and far less than that for video calls, so a room measuring well above those is fine even if the number looks low next to your plan.
Why is my Wi-Fi speed different in every room?+−
Because signal weakens with distance and with every wall it crosses, and weaker links run at lower data rates with more retries. A 30 cm bearing wall costs 20-25 dB at 2.4 GHz and leaves roughly a tenth of the open-space distance, and higher bands fare worse — which is why the fast band dies first in far rooms.
Should I test Wi-Fi speed on my phone or my laptop?+−
Either, but use the same one throughout. Radios differ between devices, so mixing a new phone and an old laptop in one survey produces numbers you cannot compare. A phone is usually easier because you can carry it room to room and most speed-test apps show signal strength alongside the result.
Illustrative
