Have you ever noticed that videos on YouTube Is it constantly freezing in one room, but loading instantly in another? Or why does a laptop in the corner of the apartment suddenly lose connection to the router, even though everything works fine on the smartphone? The cause is almost always Wi-Fi signal strength — a parameter that most users evaluate simply by the number of "bars" on the network icon. However, this method only provides a rough idea, and more in-depth tools are required for accurate problem diagnosis.
In this article we will look at how measure Wi-Fi strength On various devices—from smartphones to specialized analyzers—what indicators are considered normal, and what to do if the signal is weak. You'll learn why even A router with Wi-Fi 6E support may show poor results in real-world conditions., and how to correctly interpret signal level data in decibels (dBm). And also, why sometimes the problem lies not with the router, but with the client device settings.
Why the "Badges" on the Wi-Fi Icon Are Lying: Signal Strength Myths
Most users evaluate Wi-Fi quality by the number of filled segments on the network icon in the notification bar. However, this method has three critical drawbacks:
- 📱 Subjective scaleDevice manufacturers independently determine how many bars to show at a given signal level. For example, iPhone can display 3 of 4 segments at -70 dBm, and Samsung Galaxy - only 2 with the same value.
- 🔄 Dynamic change: The icon is updated with a delay (sometimes up to 10 seconds), so when moving around the room you will not see the real picture.
- 🚫 Ignoring interference: The icon only shows the signal strength, but does not take into account noise level and channel load, which directly affect speed.
Furthermore, some devices (especially budget smartphones and tablets) artificially inflate the displayed signal level to prevent users from complaining about a poor connection. For example, tests revealed that Xiaomi Redmi Note 10 shows a 10-15% higher signal level than measured by professional instruments.
What is dBm and what are normal signal readings?
dBm (decibel-milliwatt) — is the standard unit of measurement for signal strength in wireless networks. Unlike percentages or "bars," dBm provides a precise numerical value that can be compared between devices. closer to zero, the stronger the signal. For example:
- 🟢 −30 dBm - excellent signal (maximum speed, stable connection).
- 🟡 −50 dBm - good signal (minor speed losses are possible over long distances).
- 🟠 −70 dBm — satisfactory signal (4K video may lag, connection interruptions are possible).
- 🔴 -90 dBm and below - weak signal (constant interruptions, low speed, connection problems).
It is important to understand that real internet speed depends not only on the signal level, but also on:
- 📶 Channel congestion (how many neighboring networks broadcast on the same frequency).
- 🔄 Shumov (interference from microwaves, wireless headphones, Bluetooth devices).
- 🖥️ Client device characteristics (for example, an older laptop with an 802.11n Wi-Fi adapter will not be able to utilize Wi-Fi 6 speeds).
| Signal level (dBm) | Connection quality | Possible problems | Recommendations |
|---|---|---|---|
| -30 to -50 | Excellent | No | Optimal settings, suitable for high-speed tasks (online gaming, 4K streaming) |
| -50 to -65 | Good | Slight drop in speed at the edge of the coverage area | Check your router's channel settings and avoid automatic selection. |
| -65 to -75 | Satisfactory | Slow file loading, video lagging | Consider installing a repeater or mesh system |
| -75 to -90 | Weak | Frequent disconnections, inability to connect some devices | Check the location of the router, replace the antennas, or reduce the transmission power of neighboring networks. |
| -90 and below | Critical | The network may not be displayed or may connect with errors. | Use a wired connection or alternative technologies (Powerline, MoCA) |
Method 1: Checking Wi-Fi Strength on Windows (Without Third-Party Programs)
If you are using a laptop or PC with a Wi-Fi adapter, you can measure the signal strength using standard tools. WindowsThis method does not require installation of additional software and works on all versions of the system, starting from Windows 7.
Instructions:
- Press the key combination
Win + Xand select Terminal (Windows PowerShell). - Enter the command:
netsh wlan show interfaces - Find the line Signal — the signal level will be indicated there in percentage and in dBm (for example,
95% (−48 dBm)).
Pay attention to the parameter Rx (reception) and Tx (transmission) - if they differ greatly (for example, Rx: -50 dBm, Tx: -80 dBm), this may indicate problems with the adapter or drivers.
Open PowerShell | Run Command netsh wlan show interfaces|Check the Signal line|Compare Rx and Tx values|Update the adapter driver if there are discrepancies-->
⚠️ Attention: IN Windows 11 The command may display data with a delay of up to 30 seconds. For accurate measurements, repeat the command 2-3 times with a 5-second interval and take the average value.
Method 2: Monitoring the signal on Android and iOS
On mobile devices, measuring the exact signal level in dBm is more difficult, but possible. Manufacturers hide this data in the default settings, so you'll have to use third-party apps or the engineering menu.
For Android:
- 📱 Install the application WiFi Analyzer (from VREM Software) or NetSpotThey show the signal level in real time and also analyze channel load.
- 🔧 Alternative method: Enter the code into your phone dialer
##4636##, go to the menu Wi-Fi information and find the line Wi-Fi signal strength.
For iPhone:
- 🍎 In iOS There is no built-in way to see dBm, but you can use an app AirPort Utility (download it from App Store, even if you don't have a router Apple).
- 📊 Turn on Wi-Fi Scanner in the utility settings and start scanning - it will show the signal level in dBm for all available networks.
On iPhone A “secret” method also works: hold down the Wi-Fi icon in Control center (Swipe down from the upper right corner) - a numerical value for the signal strength will appear. However, it updates less frequently than in specialized apps.
Why doesn't the iPhone have a built-in dBm display?
Apple deliberately hides technical details to simplify the interface for everyday users. Furthermore, the company uses proprietary signal quality assessment algorithms that take into account not only strength but also connection stability, latency, and other parameters.
Method 3: Professional tools (Wi-Fi analyzers)
If you need to do more than just measure signal strength, but also analyze interference, select the optimal channel, or diagnose network problems, you'll need specialized software. These are suitable for network administrators, but they're also useful for regular users looking to maximize their Wi-Fi network optimization.
Top 3 programs for deep analysis:
- 🖥️ Acrylic Wi-Fi (Windows) — displays signal strength in dBm, analyzes neighboring networks, and creates coverage heatmaps. A free version with limited functionality is available.
- 🌐 inSSIDer (Windows/macOS) — visualizes channel congestion and helps you choose the least busy one. Supports Wi-Fi 6.
- 📱 WiFi Explorer (macOS) - a user-friendly interface for monitoring signal, speed, and interference. Ideal for users MacBook.
Example of use Acrylic Wi-Fi:
- Install the program and run the scan.
- Go to the tab Channels — a channel load graph will be displayed. The optimal channel is the one with the least overlap with neighboring networks.
- On the tab Devices You'll see all connected devices and their signal strength. If one device shows -80 dBm and the others -50 dBm, the problem is with that device (for example, a weak adapter or interference in the signal path).
⚠️ Attention: Some routers (especially budget models from TP-Link And D-Link) automatically change the channel upon reboot, ignoring manual settings. If you manually selected channel 6, and after a reboot the router reverts to channel 11, check the settings. Auto Channel Selection and turn it off.
Method 4: Checking via the router's web interface
Any router displays information about connected devices and their signal strength. This data is useful if you want to see the router's side of the picture—sometimes a device shows a strong signal, but the router sees it as weak (and vice versa).
How to check the signal strength on a router:
- Connect to the router via cable or Wi-Fi.
- Open your browser and enter the router's IP address (usually
192.168.0.1or192.168.1.1). - Log in (default logins and passwords are indicated on the router sticker).
- Go to the section Wireless network (or
Wireless,Wi-Fi). - Find the list of connected devices - there will be a column with the signal strength (for example, Signal Strength or RSSI).
Examples of popular router interfaces:
- 🔄 ASUS RT-AX88U:
Network Map → Clients. - 📡 TP-Link Archer C6:
Wireless Mode → Wireless Mode Statistics. - 🌐 Keenetic:
Devices → Device List(hover over the device to see RSSI).
Method 5: Testing using the command line (macOS/Linux)
Users macOS And Linux They can measure Wi-Fi signal strength using a terminal. This method provides accurate data and works without installing additional software.
For macOS:
- Open Terminal (
Applications → Utilities → Terminal). - Enter the command:
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I - Find the line agrCtlRSSI — this is the signal level in dBm.
For Linux (Ubuntu/Debian):
- Open Terminal (
Ctrl + Alt + T). - Enter:
iwconfig wlan0 | grep Signal(replace
wlan0the name of your Wi-Fi interface, which can be found using the commandip a). - The result will be in the format
Signal level=−67 dBm.
IN Linux You can also use the utility nmcli to monitor the signal in real time:
watch -n 1 "nmcli device wifi list | grep '*'"This command will update the list of networks every second, marking the current network with an asterisk (*) and showing the signal level.
How to Boost a Weak Signal: 5 Practical Tips
If your measurements show that the signal level in your network is below -70 dBm, it's time to take action. Here 5 proven methods improve coverage:
- 📍 Change the location of the router: Place it in the center of the apartment, raise it to a height of 1–1.5 meters (for example, on a shelf), avoid closed cabinets and concrete/metal walls.
- 🔄 Change Wi-Fi channel: Use programs like inSSIDerto find the least crowded channel. In apartment buildings, it's best to choose channels 1, 6, or 11 (for 2.4 GHz) and 36–48 (for 5 GHz).
- 📶 Update your router firmwareManufacturers regularly release updates that improve signal stability and strength. Check the latest version in the web interface.
- 🔌 Use a repeater or mesh system: If the router does not cover the entire area, install a repeater (for example, TP-Link RE605X) or switch to the Mesh system (Google Nest Wi-Fi, ASUS ZenWiFi).
- 🔧 Adjust the transmit power: In some routers (for example, ASUS or Keenetic) you can manually increase the transmission power (parameter
Tx Power). The optimal value is 70–80% of the maximum.
⚠️ Attention: Increasing the router's transmission power (Tx Power) may lead to overheating device and shorten its lifespan. If your router starts to get very hot after changing this setting, restore it to factory settings.
FAQ: Frequently Asked Questions about Wi-Fi Strength
My router shows a signal strength of -60 dBm, but the speed is low. What's the problem?
Most likely, it is not a matter of signal strength, but interference or channel congestionCheck how many neighboring networks are running on your channel (using WiFi Analyzer), and change the channel in your router settings. Also, make sure your device is connected to the correct frequency (5 GHz is faster, but has poorer penetration through walls).
On iPhone the signal shows 3 bars, but on Android it shows 1. Why is that?
Manufacturers calibrate signal indicators differently. Apple uses a more "optimistic" scale, where 3 bars can correspond to -75 dBm, whereas on Android At this level, the reading will be 1–2 bars. For precise measurements, use apps that display the reading in dBm.
What signal strength is needed for online gaming?
For stable play (for example, in CS2 or Fortnite) It is recommended that the signal level is not lower than −65 dBm. Also important stability (no jumps) and ping (latency). If the signal is weak, connect to the router via cable or use a Wi-Fi adapter with an external antenna (for example, ASUS PCE-AX58BT).
Is it possible to boost WiFi signal using foil or cans?
Theoretically, yes—metal surfaces reflect radio waves, and some users actually achieve local signal boosting by placing foil or a can behind the router's antenna. However, this method unstable and may degrade coverage in other areas. For reliable results, it's best to use a repeater or directional antenna.
Why does the Wi-Fi signal weaken at night?
This may be due to:
- 🌙 Increasing the number of active devices on the network (for example, automatic software updates or backups).
- 📡 Interference from neighboring routers (more people use the Internet in the evening).
- 🔌 Router overheating (if it works 24/7 without a break).
Try rebooting your router before going to bed or setting it up reboot schedule in its web interface.