Checking Your Wi-Fi Router's Signal: From Basic Methods to Professional Diagnostics

A weak Wi-Fi signal is one of the most common problems with home networks, manifesting itself as constant connection drops, slow page loading, or the inability to connect devices in distant rooms. Causes can range from incorrect router settings to external interference from neighboring networks or household appliances. But before buying a signal booster or replacing your router, it's worth considering objectively assess the current state of the Wi-Fi network.

In this article, we'll cover all available signal testing methods—from built-in operating system tools to specialized apps and analyzing your router's technical parameters. You'll learn how to measure signal strength on different devices, what values are considered normal, and what to do if test results are disappointing. We'll pay special attention to hidden settings, which affect the transmission power, but are often ignored by users.

1. What is "Wi-Fi signal strength" and what indicators are important?

Wi-Fi signal strength is measured in decibels per milliwatt (dBm) — a negative value, where -30 dBm is considered an excellent signal, and -90 dBm — critically weak. The closer the number is to zero, the better. For example, -50 dBm will ensure a stable connection, and -75 dBm may already cause delays in data transmission.

In addition to signal strength, connection quality is affected by:

📶 Noise Level — interference from other networks or devices (measured in dBm, ideally if the difference between signal and noise is ≥ 25 dB).
🔄 Channel congestion — the number of neighboring networks operating at the same frequency (2.4 GHz or 5 GHz).
📊 Data transfer rate — actual throughput (Mbps), which depends on the Wi-Fi standard (802.11n, 802.11ac, 802.11ax).
🔗 Link Quality — percentage of successful data packets (ideally ≥ 80%).

It is important to understand that Even with a high signal level (-40 dBm), the actual speed may be low due to a congested channel or an outdated Wi-Fi standard.For example, if your router operates at 2.4 GHz in an apartment building where all the neighbors use the same channel, interference will negate the benefits of a strong signal.

⚠️ Attention: Router manufacturers often indicate “transmission power” in their specifications (for example, 20 dBm), but this maximum A value that may be limited by regional regulations (in Russia, up to 100 mW or ~20 dBm for 2.4 GHz). Actual power depends on firmware settings.

2. How to check the Wi-Fi signal on Windows (without software)

Windows has built-in tools for assessing signal strength that don't require additional software. The easiest way is to check the number of bars in the system tray, but this is a subjective assessment. For accurate data, use the following methods:

Method 1: Via the Network and Sharing Center

Right-click on the Wi-Fi icon in the tray and select Open Network and Internet settings.
Go to Wi-Fi → Manage known networks.
Click on the name of your network and look at the line Properties - it will be indicated there signal level in percent (but not in dBm).

Method 2: Via the command line

Open Command line (Win + R → enter cmd) and run the command:

netsh wlan show interfaces

Find the line in the results Signal — the level will be shown there as a percentage. To get the value in dBm, use the formula:

Level in dBm ≈ -100 + (Level in % × 0.5)

For example, if the signal is 80%, then -100 + (80 × 0.5) = -60 dBm.

3. Checking the signal on Android and iOS: apps and hidden menus

Mobile devices offer a quick way to assess signal strength, but default settings often obscure technical details. Let's look at methods for both platforms.

On Android:

📱 Hidden engineering menu (does not work on all models):

Open the app Telephone and enter ##4636##.
Select Wi-Fi information (or Wi-Fi Information).
In the line Wi-Fi signal strength The level in dBm will be indicated.

🔍 Analyzer applications: WiFi Analyzer (from VREM Software Dev) or NetSpot show the signal in real time, as well as the channel load.

On iOS (iPhone/iPad):

🍎 There are no built-in tools for displaying dBm, but you can use an app AirPort Utility (install it from the App Store even if you don't have Apple hardware):

Open Settings → AirPort Utility → Wi-Fi Scanner.
Click Scan — there will be a column in the results RSSI (this is the signal level in dBm).

📊 Alternative: app WiFi SweetSpots visualizes network coverage in the home.

⚠️ Attention: On iPhones, starting with iOS 14, Apple has restricted apps' access to signal strength data in the background. To get up-to-date data, manually initiate a scan within the app.

📊 What device do you most often use to test Wi-Fi?

Smartphone (Android)

iPhone/iPad

Laptop/PC with Windows

MacBook

Other

4. Professional tools: from Wi-Fi analyzers to spectrum analyzers

If you need more than just numbers, detailed network analysis (for example, to set up a mesh system or find sources of interference), it's worth using specialized software. These tools are suitable for experienced users and network administrators.

Tool	Platform	Possibilities	Complexity
NetSpot	Windows, macOS	Coverage map, channel analysis, speed test	Average
inSSIDer	Windows	Real-time network monitoring, signal/noise graphs	High
Wireshark	Windows, macOS, Linux	Packet interception and analysis, loss diagnostics	Very high
Ubiquiti WiFiman	Android, iOS	Channel scanning, bandwidth test	Low

For deep diagnostics (for example, searching for hidden interference from microwaves or wireless cameras) use spectrum analyzers - devices like MetaGeek Wi-Spy or Ekahau SidekickThey show airtime congestion across the entire frequency range, not just Wi-Fi channels. This equipment is expensive (starting at 50,000 rubles), but it's indispensable for professional network setup in offices or hotels.

What is the difference between a spectrum analyzer and a Wi-Fi analyzer?

A Wi-Fi analyzer (such as inSSIDer) only displays 802.11 networks and their parameters (channel, power, noise). A spectrum analyzer, on the other hand, scans the ENTIRE radio frequency range (e.g., 2.4–2.5 GHz or 5.15–5.85 GHz) and identifies interference from non-Wi-Fi devices, such as wireless headphones, baby monitors, walkie-talkies, and microwave ovens. This allows you to more accurately pinpoint the source of problems if the signal is weak for no apparent reason.

5. Checking the signal via the router's web interface

Any modern router allows you to view Wi-Fi statistics directly in its web interface. This is convenient if you need to evaluate the signal not from the client device's perspective, but from the source's. The instructions are universal for most models (TP-Link, ASUS, Keenetic, MikroTik), but the location of the menu items may differ.

Steps to enter router settings:

Find out the IP address of the router (usually 192.168.0.1, 192.168.1.1 or 192.168.8.1). It can be found on the sticker on the case or through the command ipconfig (Windows) / ifconfig (macOS/Linux).
Enter your IP address in the browser address bar and log in (the default login and password are often admin/admin).
Go to the wireless networks section (for example, Wireless, Wi-Fi, Wireless network).

Where to look for signal data:

📡 Client status - a list of connected devices with an indication of the signal level (for example, Wireless → Wireless Statistics V TP-Link).
📈 Power graphs - some routers (for example, ASUS RT-AX88U) show the signal dynamics in real time.
🔧 Transfer settings — in the section Advanced or Professional you can see the current transmit power (Tx Power), which can be increased if necessary (but do not exceed local regulations!).

⚠️ Attention: In routers with firmware OpenWRT or DD-WRT Advanced diagnostic tools are available, including commands iwconfig And iwinfo in the terminal. For example, the command iwinfo wlan0 assoclist will show the signal level of all connected clients in dBm.

Signal level of connected devices (dBm)

Channel congestion (2.4 GHz / 5 GHz)

Current transmit power (Tx Power)

List of neighboring networks (for interference analysis)

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6. How to interpret the results: normal values and signs of problems

Once you've received signal strength data, it's important to evaluate it correctly. Below is a table with recommended values for different usage scenarios:

Signal level (dBm)	Connection quality	Suitable for	Possible problems
-30 … -50	Excellent	Online gaming, 4K video streaming, video conferencing	No
-50 … -60	Good	Full HD viewing, work with cloud services	Minor delays under high load
-60 … -70	Satisfactory	Internet surfing, social media, music	Slowdowns when loading large files, video cuts out
-70 … -80	Weak	Text messages, mail	Constant connection breaks, low speed
-80 … -90	Critical	Almost unusable	Devices do not connect or disconnect immediately

If your numbers are less than ideal, check the following:

📍 Router location - it should be located in the center of the house, on a raised surface (for example, on a cabinet), away from metal objects and household appliances.
🔄 Channel and frequency — on 2.4 GHz, choose the least loaded channel (use analyzer applications), on 5 GHz, choose channels with less interference (for example, 36–48 or 149–165).
🔌 Power and antennas — Make sure the router is receiving sufficient power (try a different power supply) and that the antennas are directed optimally (for unidirectional antennas, towards the devices).
🔄 Router firmware — Outdated firmware may limit transmission power. Update the firmware via the web interface.

7. Common Signal Checking Mistakes and How to Avoid Them

Many users make the same mistakes that distort diagnostic results. Here are the most common ones:

Error 1: Checking the signal near the router

Measuring the signal strength a meter away from the router is pointless—it will always be excellent. Test in places where you actually use the internet (for example, on the couch in the living room or in the kitchen).

Mistake 2: Ignoring interference from neighboring networks

Even if your router shows a high signal strength, neighboring networks on the same channel may be clogging up the airwaves. Always check channel congestion using analyzers (e.g., WiFi Analyzer).

Mistake 3: Using outdated Wi-Fi standards

If your router or device operates according to the standard 802.11n (Wi-Fi 4), the maximum speed will be limited even with an excellent signal. For modern tasks (4K, gaming, smart home), you need 802.11ac (Wi-Fi 5) or 802.11ax (Wi-Fi 6).

Mistake 4: Neglecting to update drivers

On a PC or laptop, outdated Wi-Fi adapter drivers can reduce signal strength. Update them via device Manager or from the manufacturer's website (for example, Intel, Qualcomm Atheros, Broadcom).

Mistake 5: Testing on only one device

The signal level can vary greatly between devices due to different receiver sensitivities. For example, iPhone usually shows a weaker signal than Samsung Galaxy, even at one point. Check on 2-3 devices for objectivity.

⚠️ Attention: Some router manufacturers (eg. Xiaomi or Mercusys) inflate signal strength figures in mobile apps for marketing purposes. For accurate data, use third-party analyzers or a web interface.

FAQ: Answers to Frequently Asked Questions

My router shows a signal of -65 dBm, but the speed is low. What's wrong?

There may be several reasons:

High channel load (many neighboring networks on the same frequency).
Restriction from the provider (check your tariff).
An older Wi-Fi standard (e.g. 802.11n instead of 802.11ac).
DNS problems (try changing the DNS server to 8.8.8.8 or 1.1.1.1).

First, check the speed via cable (Ethernet) - if it is also low, the problem is not with Wi-Fi.

How to check Wi-Fi signal on MacBook?

On macOS, hold down the key Option (⌥) and click on the Wi-Fi icon in the menu bar. The drop-down list will display information about the network, including RSSI (signal level in dBm). You can also use the built-in utility Wireless Diagnostics (open it via Spotlight on request) Wireless Diagnostics).

Is it possible to increase the router signal strength through the settings?

Yes, most routers have this option. Transmit Power (or Tx Power) in the wireless settings section. It can be increased to the maximum value (usually 100% or 20 dBm), but:

This may violate local regulations (in Russia, the maximum permitted power for 2.4 GHz is 100 mW or ~20 dBm).
Increasing power increases energy consumption and heating of the router.
In practice, this rarely provides a significant increase in range if the problem is interference or improper placement of the router.

Why does the signal on the phone show -40 dBm, but on the laptop it shows -70 dBm at the same point?

This is normal because:

Smartphones and laptops have different Wi-Fi modules with different sensitivities.
Antennas in phones are usually more modern (MIMO, beamforming).
Laptops may have older adapters (e.g. 802.11n instead of 802.11ac).
The orientation of the device affects the readings (for example, a metal laptop case can shield the signal).

For objectivity, compare performance on devices of the same class (for example, two smartphones).

How can I check if my neighbor is stealing my Wi-Fi if the signal suddenly becomes weak?

If you suspect an unauthorized connection:

Go to the router's web interface and look at the list of connected devices (DHCP Clients List or Connected Devices).
Check MAC addresses: unknown addresses may belong to other people's gadgets.
Change your Wi-Fi password to a more complex one (use WPA3, if the router supports it).
Enable MAC address filtering (although this does not guarantee 100% protection).

A weak signal doesn't always mean a hack—it's more often a result of interference or a faulty router.