Weak Wi-Fi signal in distant rooms, constant connection drops when watching videos, or slow file downloads—do you feel this way? Before rushing out to buy a new router or extender, it's worth checking out objectively measure the signal level in different parts of the apartment. The problem may not be the router's power, but rather its incorrect placement, interference from neighbors, or outdated settings.
In this article you will find 5 working methods Wi-Fi signal measurements - from simple (from a smartphone) to professional (with a spectrum analyzer). We'll look at which the indicators are considered normal, how to interpret them, and what to do if the signal is weak. And finally— A unique table of signal strength (dBm) and actual internet speed., which you will not find in standard instructions.
Why it's important to measure your Wi-Fi signal, not guess.
Many users evaluate Wi-Fi quality based on subjective criteria: "pages load slowly," "videos lag," or "the signal icon on the phone shows two bars." But this approach is misleading:
- 📱 Icons on devices show relative signal level, not the actual values in
dBm(decibel-milliwatt). For example, 3 sticks on iPhone can correspond to either -60 dBm (excellent signal) or -80 dBm (marginal). - 🌐 Internet speed It depends not only on the signal, but also on the channel load, the provider's tariff, and even the time of day. Speed test on Speedtest will not show the true cause of the problems.
- 🏠 Interference from neighbors They can clog your channel, even if the signal is strong. Without analyzing the airwaves, you won't know if your router is operating on an overloaded frequency.
Accurate measurements help:
- 🎯 Select the optimal place for a router (for example, move it closer to the center of the apartment).
- 🔄 Select less congested channel in the router settings (for example, switch from automatic selection to manual).
- 📡 Assess the need for signal amplifiers (repeaters, Mesh systems) or replacing antennas.
⚠️ Note: If you live in an apartment building, channel load data may change over time. For example, in the evening, when neighbors are actively using Wi-Fi, interference increases. For a more accurate picture, take measurements at different times of day.
Method 1: Quick check from your smartphone (Android/iOS)
The easiest method is to use a mobile device. It is suitable for primary diagnostics, but does not give a complete picture (for example, it does not show channel load).
On Android
Most smartphones on Android hide the real signal values in dBm, but they can be seen through engineering menu or third-party applications:
- Install the application WiFi Analyzer (from farproc>) or NetSpot.
- Open the app and go to the tab
Signal MeterorAnalyzer. - Please note the meaning in
dBmnext to your network name. For example,−55 dBm- excellent signal,−85 dBm- weak.
For advanced users: can be used hidden menu Android. Enter the code in the phone dialer. ##4636##, then select Wi-Fi informationThere will be a line there. Wi-Fi signal strength with the current value in dBm.
On iPhone
Apple does not provide direct access to dBm values, but there is a workaround:
- Install the application AirPort Utility (official from Apple).
- Turn on the mode
Wi-Fi Scannerin the application settings (this may require you to enable it throughSettings → AirPort Utility → Wi-Fi Scanner). - Start scanning - the application will show the signal level in
RSSI(this is analogous to dBm).
Alternative: app NetAnalyzer or WiFi SweetSpots (paid, but with advanced features).
Method 2: Detailed analysis from a laptop (Windows/macOS/Linux)
Computers provide more accurate data than smartphones and allow you to evaluate not only the signal strength, but also channel congestion, which is critical for choosing optimal router settings.
On Windows
Built-in Windows tools display signal strength as a percentage, not in dBm. To get accurate data:
- Open
Command line(Win + R→ entercmd). - Run the command:
netsh wlan show interfaces - Find the line
Signal— the value will be in percentage. To convert it to dBm, use the formula:dBm = −100 + (percent × 0.5)For example, 80% ≈ -60 dBm.
For advanced analysis, install inSSIDer or Acrylic Wi-Fi (The paid version even shows hidden networks.) These programs visualize channel congestion and help you choose the freest one.
On macOS
On MacBook or iMac you can use the built-in utility Wireless Diagnostics:
- Hold
Option (Alt)and click on the Wi-Fi icon in the menu bar. - Select
Open Wireless Diagnostics. - In the window that opens, go to
Window → Utilitiesand selectWi-Fi Scan. - Click
Scan Now— the program will show the signal level (RSSI) and channel congestion.
For Linux, the following utility is suitable iwconfig or LinSSID (graphic analyzer).
Determine the current signal level in dBm
View channel load (2.4 GHz and 5 GHz)
Record data for 3-5 points in the house
Compare with the optimal values from the table below
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Method 3: Professional tools (Wi-Fi analyzers)
If you need the most accurate data (for example, to set up a Mesh system or office network), it is worth using specialized devices or software:
- 📡 Hardware analyzers: Wi-Fi Explorer Pro (for macOS), Ekahau Sidekick (a professional device for an engineer). They show not only the signal level, but also interference, channel overlap, signal-to-noise ratio (SNR).
- 💻 Software solutions: Aircrack-ng (for Linux, requires knowledge), Wireshark (packet sniffing). These tools are suitable for in-depth diagnostics, but are difficult for beginners.
Sample report from Ekahau Sidekick includes:
- Wi-Fi coverage map with color-coded weak signal areas.
- Recommendations for the location of access points.
- Data on channel overlap between adjacent networks.
⚠️ Attention: Professional analyzers (eg. Ekahau) cost from 50,000 rubles and require training. For home use, free programs like inSSIDer or WiFi Analyzer.
Method 4: Manual testing using a router
Some routers (eg. ASUS RT-AX88U, TP-Link Archer C5400) have built-in signal monitoring tools. To use them:
- Go to the router's web interface (usually at
192.168.1.1or192.168.0.1). - Find the section
Wireless,Wi-Fi AnalyticsorClient List. - Check your signal level (
RSSI) for connected devices. For example, in ASUS this is a tabNetwork Map → Clients.
The advantage of this method: you see the signal from the router side, not the client device. This is useful if the problem lies with the antennas or the router's settings.
Disadvantage: Not all routers support this feature. In budget models (for example, TP-Link TL-WR840N) such an option may not exist.
How to enable hidden Wi-Fi settings on TP-Link routers
In the address bar of your browser after logging into the control panel, add /userRpm/WlanStationRpm.htmFor example, the full URL would look like this: 192.168.0.1/userRpm/WlanStationRpm.htmThere you will find detailed information about connected devices, including signal strength.
Method 5: Measuring the signal using specialized applications
For those who don't want to fiddle with the command line or engineering menus, there are convenient mobile and desktop apps with data visualization:
| Application | Platform | Functions | For free? |
|---|---|---|---|
| WiFi Analyzer | Android | Channel load chart, signal level in dBm, channel selection recommendations | Yes |
| NetSpot | Windows/macOS | Wi-Fi coverage map, interference analysis, and change history | Conditional (basic version is free) |
| Fing | Android/iOS | Network scanning, speed test, device detection | Yes (premium features are paid) |
| inSSIDer | Windows/macOS | Detailed channel analysis, network filtering, report export | No (free version with limitations) |
Example of use NetSpot:
- Install the application and create a new project.
- Walk around the apartment with a laptop, marking points on the map.
- The program will automatically create a heat map of the signal, where green is a strong signal and red is a weak signal.
Table: Correspondence between signal level (dBm) and connection quality
To correctly interpret your measurement results, use this table. It shows what signal level is considered normal for different tasks:
| Signal level (dBm) | Connection quality | Suitable for | Recommendations |
|---|---|---|---|
| -30 to -50 | Excellent | Any tasks (online games, 4K video, downloading large files) | Perfect signal. You can try reducing your router's power to reduce interference. |
| -50 to -60 | Very good | Streaming video (Full HD), video calls, work | Optimal balance. No need for changes. |
| -60 to -67 | Good | Internet surfing, social media, SD video | Occasional slowdowns are possible under high load. |
| -67 to -70 | Satisfactory | Basic use (mail, instant messengers) | It is recommended to check the router settings or its location |
| -70 to -80 | Weak | Minimal tasks (checking email, text messages) | Need a repeater, mesh system, or router antenna replacement? |
| -80 and below | Critical | The connection is unstable or absent | You need to change the location of your router or switch to a wired connection. |
Important: The values in the table are valid for modern Wi-Fi standards (802.11ac/ax). For older routers (802.11n), the minimum acceptable signal level is -65 dBm, as they are less sensitive to interference.
What to do if the signal is weak: 3 steps to a solution
If measurements show that the signal level in some areas is below -70 dBm, follow this algorithm:
- Check the location of the router:
- 📍 The perfect place - center of the apartment, at a height of 1–1.5 meters from the floor.
- 🚫 Avoid placing near metal objects, mirrors, microwaves.
- 🌿 Plants and aquariums also weaken the signal (water absorbs radio waves).
- Optimize your router settings:
- 🔄 Switch to less congested channel (use data from WiFi Analyzer).
- 📶 If the router supports
5 GHz, connect to this frequency - it is less susceptible to interference, but it passes through walls worse. - 🔒 Turn on
WPA3instead ofWPA2(if supported) - this will not boost the signal, but will improve stability.
- 📡 Buy repeater (For example, TP-Link RE605X) or Mesh system (Google Nest WiFi).
- 🔄 Replace your router's standard antennas with externally directed (For example, TP-Link TL-ANT2408CL).
- 💻 For desktop devices (PC, Smart TV) use Powerline adapters (Internet transmission via electrical wiring).
⚠️ Please note: If you live in a house with thick concrete walls, no router will provide a stable signal in all rooms without additional equipment. In such cases, it's best to combine Wi-Fi with wired solutions (for example, by running cable to problem areas).
FAQ: Frequently asked questions about Wi-Fi signal measurements
Is it possible to measure a signal without special programs?
Yes, but the data will be less accurate. Android you can use the engineering menu (code ##4636##), on Windows — command line (netsh wlan show interfaces). However, these methods will not show channel congestion or interference.
What signal strength is needed for online gaming?
For stable play (for example, in CS:GO, Fortnite) a signal no weaker is required −60 dBm. In this case, not only the signal strength is important, but also ping (latency). If the ping is higher than 50 ms, the problem may be with your ISP, not your Wi-Fi.
Why does my phone have 3 signal bars but the speed is low?
This is a typical situation when:
- 📶 The router is operating on a congested channel (many neighbors on the same frequency).
- 🔄 The device is connected to
2.4 GHz, and not to5 GHz(the second range is less busy, but not all devices support it). - 🔌 Your provider is limiting your speed (check your tariff).
Use WiFi Analyzerto check the channel load.
Is it necessary to measure the signal at 5 GHz and 2.4 GHz separately?
Yes, absolutely! These ranges have different characteristics:
- 2.4 GHz: passes through walls better, but is susceptible to interference (microwaves, Bluetooth devices).
- 5 GHz: higher speed and less interference, but worse coverage (the signal fades faster).
If your router supports both bands, check the signal on each and choose the one that best suits your needs.
How often should I check my signal strength?
It is recommended to take measurements:
- 🏠 After moving or rearranging furniture.
- 🔄 When new devices that consume Wi-Fi (smart bulbs, cameras) appear.
- 📡 Once every 3-6 months, if your internet speed has dropped unexpectedly (perhaps your neighbors have installed new routers).