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Check the Wi-Fi signal where you actually use your device. The Wi-Fi icon is a quick clue; a router’s client details or a Wi-Fi analyzer can show a more specific reading called RSSI, usually measured in dBm. RSSI values are commonly negative, and a reading closer to zero is stronger: -55 dBm is stronger than -70 dBm. Treat any threshold as a guide, then compare the reading with your connection’s reliability and speed.
How to check your Wi-Fi signal
Start with the Wi-Fi icon
Look at the Wi-Fi indicator on the device while you are in the room where you normally use it. Bars make for a fast check, but their scale is not standardized across devices, so they are not a precise measurement.
Get an RSSI reading
For a numeric reading, use a Wi-Fi analyzer app or check the connected device’s details in your router or access point interface. Microsoft recommends analyzer apps for checking signal around the home; TP-Link describes checking RSSI through its router interface or Aginet app on applicable products. NHS England Digital notes that professional survey tools can be used for accurate RSSI measurement.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →RSSI is typically shown in dBm. Because the values are negative, less negative means stronger: -60 dBm is stronger than -67 dBm. RSSI measures received signal strength, not internet speed.
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Test where the connection matters
Take readings in the rooms and spots where you use Wi-Fi, not just beside the router. Record the signal and run the same speed or reliability check in each location. Repeat after moving the router or device so you can compare before and after. Microsoft recommends recording tests in different parts of the home and comparing results after changes.
What counts as a strong Wi-Fi signal?
There is no single universal RSSI grading scale for every router, device, band, or activity. The following are examples from vendor guidance, not guaranteed performance cutoffs:
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| RSSI example | Guidance description | Source context |
|---|---|---|
| Above -60 dBm | Excellent | Ubiquiti WiFi Troubleshooting Guide |
| -60 to -70 dBm | Acceptable in Ubiquiti guidance; TP-Link labels -61 to -70 dBm fair | Different vendor guidance and contexts |
| -71 to -80 dBm | TP-Link labels this poor; Ubiquiti says clients should begin to roam around -70 to -75 dBm | Different vendor guidance and contexts |
| Below -80 dBm | Ubiquiti says a connection is likely to be unstable; TP-Link labels -81 dBm or lower very weak | Different vendor guidance and contexts |
Ubiquiti’s separate connectivity guidance says -70 dBm or better is required for stable connections in its cited context. That is still vendor guidance, not a universal rule. A reading near -70 dBm may work acceptably for one device or use and perform poorly for another.
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Microsoft Support puts the practical goal simply: “A stronger signal gives you a better chance of a reliable Wi-Fi connection.” A strong reading improves the odds, but does not by itself establish that your connection is fast or problem-free.
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Why a strong signal can still feel slow
Signal strength is only one part of Wi-Fi quality. Channel congestion, interference, device behavior, and the internet connection itself can affect performance. NHS England Digital cautions that one metric cannot determine overall Wi-Fi quality or definitively identify every user problem.
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- Strong RSSI, poor speed: Check for channel congestion or interference, and consider whether the device or internet connection is the bottleneck.
- Weak RSSI and problems in one room: Local coverage or obstacles may be contributing. Compare the reading closer to the router.
- Unstable service throughout the home: Check whether other devices are affected and, where practical, compare performance using a wired connection. TP-Link recommends checking channel congestion and testing the wired connection when troubleshooting persistent instability.
What to do if the signal is weak
- Compare a nearby location. Test again closer to the router. If RSSI improves substantially, the problem may be coverage or obstacles between the router and the original location rather than the internet service itself.
- Improve placement if practical. Put the router or access point in a central, open, higher location and away from obstacles. Then re-test the rooms where you use Wi-Fi. Microsoft and TP-Link both recommend placement adjustments as a troubleshooting step.
- Consider additional coverage equipment only if needed. If one area remains weak and repositioning the router or device is impractical, an extender may help. For a mesh setup, check the wireless signal between the router and mesh access point—the backhaul—and adjust node placement if that link is weak.
- Investigate other causes when RSSI is strong. If the signal is good but performance is poor, check congestion, interference, device behavior, and the upstream internet connection instead of assuming that more coverage equipment will solve it.
Sources and scope
- Microsoft Support, “Wi-Fi and your home layout” (Windows 10/11 guidance; page accessed October 7, 2026).
- Ubiquiti Help Center, “WiFi Troubleshooting Guide” (guidance accessed October 7, 2026).
- TP-Link, “Troubleshooting intermittent or no Wi-Fi connection” (updated May 20, 2025; applies to listed TP-Link service-provider hardware).
- NHS England Digital, “Identifying Wi-Fi performance metrics” (guidance accessed October 7, 2026).
- Ubiquiti Help Center, “Optimizing WiFi Connectivity and Reducing Latency” (guidance accessed October 7, 2026).
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