WiFi Signal Strength Checker
Your phone or router shows signal strength in dBm. Slide to your reading to see what it means. Closer to zero is stronger.
| Reading | Quality |
|---|---|
| -30 to -50 dBm | Excellent |
| -51 to -60 dBm | Very good |
| -61 to -70 dBm | Good |
| -71 to -80 dBm | Weak |
| Below -80 dBm | Poor |
-55
Very good
What the numbers mean
WiFi signal is measured in dBm (decibel-milliwatts). The numbers are negative, and every 3 dB is roughly a doubling or halving of power. So −60 dBm is about four times stronger than −66 dBm, even though the numbers look close.
- −30 to −50 dBm: you’re next to the router. Maximum speed.
- −51 to −60 dBm: very good. Full speed for streaming and video calls.
- −61 to −70 dBm: good. The minimum for reliable HD video and calls.
- −71 to −80 dBm: weak. Browsing works, but speed drops and calls may break up.
- Below −80 dBm: poor. Expect dropouts and failed connections.
For the full explanation, including signal-to-noise ratio, read what is a good WiFi signal strength.
How to find your WiFi signal strength in dBm
Websites can’t read your WiFi signal (browsers block it for privacy), so check it on your device and enter it above:
- Windows: open Command Prompt and run
netsh wlan show interfaces. It shows “Signal” as a percentage; newer Windows 11 builds also show RSSI in dBm. - Mac: hold Option and click the WiFi icon in the menu bar. Look for “RSSI”.
- Android: some phones show it under WiFi → your network → Advanced. Otherwise a free WiFi analyzer app shows dBm.
- iPhone: iOS doesn’t show dBm. Install the AirPort Utility app and turn on its WiFi Scanner in Settings → AirPort Utility.
- Router: many router admin pages list each device’s signal. Find yours with the router login finder.
How to improve a weak signal
- Move the router up high and into the open, away from thick walls, metal and fish tanks.
- Use 2.4 GHz for range and 5 GHz for speed near the router. See 2.4 GHz vs 5 GHz, or pick a band with the WiFi channel finder.
- For large or multi-floor homes, a mesh system or a wired access point beats a plug-in extender.
Once your signal looks good, confirm the real-world result with the WiFi speed test.
Signal strength FAQ
Is −67 dBm a good WiFi signal?
Yes. −67 dBm is a commonly used minimum for reliable video calls and streaming, so it counts as good, though not as strong as −50 to −60 dBm.
Is −40 dBm better than −70 dBm?
Yes, much better. The closer to zero, the stronger the signal. −40 dBm is excellent; −70 dBm is borderline.
Why is my signal strong but my internet slow?
Signal is only the link between your device and router. Slow internet can come from a crowded channel, your plan, other devices, or your provider. Run the speed test and read why is my WiFi slow.
Guides for this tool
-
Signal Strength
What Is a Good WiFi Signal Strength?
The dBm chart, what −67 dBm means, and how to boost a weak signal. Read guide -
Speed Test
Why Is My WiFi Slow? 12 Fixes
Find the real cause of slow WiFi in 5 minutes, then fix it. Read guide -
Band & Channel
2.4 GHz vs 5 GHz vs 6 GHz
Which WiFi band to use for range, speed and gaming. Read guide