How to Check Your Laptop's Wi-Fi Signal Strength: A Step-by-Step Guide

Weak signal Wi-Fi On a laptop, a weak signal is one of the most common causes of slow internet, connection drops during video chats, or file downloads. But how can you accurately determine how strong or weak your signal is? After all, the problem often lies not with the router, but with physical obstacles, driver settings, or even the device itself.

Many users limit themselves to subjective assessments: "the internet is slow" or "the icon shows two bars." However, for an accurate diagnosis, specific numbers are needed—the signal strength in decibels (dBm), packet loss rate, or connection speed. This data will help you determine whether you need to move your router, change the broadcast channel, or update your network card drivers.

In this article we will look at all the ways to check the level Wi-Fi signal on laptops with Windows 10/11, macOS And LinuxWe'll also explain which indicators are considered normal and which require attention. You'll learn how to use the system's built-in tools, third-party utilities, and even mobile apps for network analysis.

1. What is Wi-Fi signal strength and how is it measured?

Signal level Wi-Fi — is the power of the radio waves that your laptop receives from the router. It is measured in decibels-milliwatts (dBm) — a logarithmic unit, where negative values ​​indicate signal strength. The closer the number is to zero (for example, -30 dBm), the stronger the signal. Typical ranges:

• 🔥 Excellent signal: from -30 dBm to -50 dBm - maximum speed, stable connection.
• 🟢 Good signal: from -50 dBm to -60 dBm - minor speed fluctuations are possible.
• 🟡 Average signal: from -60 dBm to -70 dBm — suitable for surfing, but 4K video may lag.
• 🔴 Weak signal: from -70 dBm to -80 dBm - connection breaks, low speed.
• ⚫ Critical signal: below -80 dBm — the internet practically doesn't work.

Besides dBm, sometimes percentage display is used (for example, in Windows). However, percentages are subjective: 100% in one system can correspond -40 dBm, and in the other - -55 dBm. Therefore, for an accurate diagnosis, focus on decibels.

The signal strength is influenced by:

• 📡 Distance to the router - every 10 meters indoors the signal loses ~10-15 dBm.
• 🧱 Obstacles — walls, furniture, household appliances (especially microwaves!) weaken the signal.
• 📶 Network frequency — 5 GHz faster, but passes through walls worse than 2.4 GHz.
• 🔄 Channel congestion - if neighbors use the same channel, the speed drops.

⚠️ Attention: Indicators dBm may vary depending on the model Wi-Fi adapter laptop. For example, Intel AX200 measures weak signals more accurately than older adapters Realtek.

2. Checking the signal strength in Windows 10 and 11

IN Windows There are several built-in ways to find out the power Wi-Fi signal without installing additional programs. Let's look at them in order, from the simplest to the more advanced.

Method 1: Network tray icon

The fastest but least accurate method:

1. Find the icon Wi-Fi in the lower right corner of the screen (next to the clock).
2. Hover your cursor over it and a tooltip will appear with the network name and the number of signal bars.
3. Click on the icon to open a list of available networks with their level displayed as a percentage.

🔹 Flaw: there are no exact values ​​in dBm, only a subjective assessment.

Method 2: Network and Sharing Center

More detailed information is hidden in the connection settings:

1. Click Win + R, enter ncpa.cpl and press Enter.
2. Double click on the active one Wi-Fi connection.
3. In the status window, look at the line "Speed" (For example, 72 Mbps) And Signal quality (in percent).

🔹 Advice: If the speed is significantly lower than the maximum for your router (for example, 72 Mbps instead of 300 Mbps), the problem may be in the channel settings or drivers.

Method 3: Command line (precise data in dBm)

To get accurate decibel values:

1. Open Command line (Win + R → enter cmd).
2. Run the command:

   netsh wlan show interfaces

3. Find the line "Signal" — there will be a value in percentage And V dBm (For example, 95% (-48 dBm)).

🔹 Example output:

Name: Wi-Fi
Description : Intel(R) Wi-Fi 6 AX200
Status: connected
Signal: 88% (-56 dBm)

⚠️ Attention: If the command line shows 0% (0 dBm), this means that the adapter is not detecting the network. Check if it is turned on. Wi-Fi on a laptop (sometimes it can be turned off by pressing keys) Fn + F2/F12).

3. Check on macOS (MacBook)

On laptops Apple The process is a little different, but no less simple. macOS There is a hidden utility Wireless Diagnostics, which shows detailed information about the network.

Method 1: Hold down the Option (⌥) key

The fastest method:

1. Hold down the key Option (⌥) on the keyboard.
2. Click on the icon Wi-Fi in the top panel.
3. A drop-down menu will appear with additional information, including:
   • 📶 RSSI — signal level in dBm (For example, -62 dBm).
   • 🔄 Tx Rate — current transfer rate.
   • 📡 Channel — the channel used.

Method 2: Wireless Diagnostics (detailed report)

For in-depth analysis:

1. Clamp Option (⌥) and click on the icon Wi-Fi.
2. Select Open Wi-Fi Diagnostics.
3. Enter the administrator password (if required).
4. In the top menu, click Window → Scanner.
5. Click Scan Now - a list of networks with accurate data will appear RSSI, noise and channels.

🔹 Advantage: The utility shows not only your network, but also neighboring ones, which helps you choose the least loaded channel.

⚠️ Attention: On MacBook with chips Apple Silicon (M1/M2) mapping dBm may differ from Intel-cars. For example, -60 dBm on M1 may correspond -55 dBm on Intel.

4. Testing in Linux (Ubuntu, Mint, etc.)

IN LinuxIn distributions, signal strength can be determined through the terminal or graphical utilities. Let's consider both options.

Method 1: Terminal commands

Open Terminal (Ctrl + Alt + T) and run:

iwconfig wlan0 | grep Signal

🔹 Example output:

Signal level=-58 dBm

For more detailed information:

iw dev wlan0 station dump

This command will show not only the signal level, but also the connection speed, the number of lost packets and other parameters.

Method 2: Graphical utilities

If the terminal seems complicated, install Wavemon:

1. Install the utility:

   sudo apt install wavemon

2. Run:

   sudo wavemon

3. Select your adapter (wlan0 or wlp3s0) and see the signal graph in real time.

🔹 Plus Wavemon: Shows not only the signal level, but also noise (Noise), which helps to assess the quality of the connection.

⚠️ Attention: In some distributions (for example, Arch Linux) the interface name may differ. To find it out, run ip a and find the line with wlan or wlp.

sudo apt install iw

iw dev wlan0 link

5. Third-party Wi-Fi analysis programs

Built-in tools provide basic information, but for in-depth diagnostics, it's better to use specialized utilities. They visualize signal strength, show channel load, and help optimize the network.

Top 3 Windows programs

How to use NetSpot (step by step)

1. Download and install NetSpot (there is a free version).
2. Run the program and select the mode "Discover".
3. Click "Start Scan" - after a few seconds a list of networks will appear indicating:
   • 📶 Signal level (dBm).
   • 📊 Channel load.
   • 🔒 Encryption type.

🔹 Advantage: NetSpot allows you to save the report in PDF format and compare the results before and after moving the router.

6. How to improve Wi-Fi signal on a laptop

If the test showed a weak signal (-70 dBm and below), try the following steps:

Quick Solutions (5 minutes)

• 🔄 Reboot your router - sometimes helps with temporary failures.
• 📍 Change the location of the router - place it higher (on a cabinet) and further away from metal objects.
• 🔌 Change the channel in the router settings (use NetSpot for workload analysis).
• 🖥️ Update your Wi-Fi adapter driver through device Manager.

Advanced Methods

• 📡 Buy a repeater (amplifier) - if the router is far away and you can’t run wires.
• 🔗 Use a Mesh system (For example, TP-Link Deco or Google Nest WiFi) for a big house.
• 🖧 Replace your router antennas to more powerful ones (if the model supports removable antennas).
• 🔧 Configure QoS in the router to prioritize laptop traffic.

⚠️ Attention: If the laptop is older than 5 years, it Wi-Fi adapter may not support modern standards (802.11ac/ax). In this case, only replacing the adapter will help (for example, Intel AX200 for PCIe or USB Wi-Fidongle).

7. Common mistakes when checking the signal

Many users make errors that distort measurement results. Here are the most common ones:

• 📱 Measuring the signal on a smartphone, not a laptop — levels dBm will be different due to different adapters.
• 🕒 Checking during peak hours (in the evening) - neighboring networks create interference, and the signal seems weaker.
• 🔌 Testing near the router - will show an excellent signal, but will not reflect the real situation in other rooms.
• 🔄 Ignoring the channel — even with a strong signal (-40 dBm) a congested channel will reduce speed.

🔹 The right approach:

1. Check the signal in the places where you usually work.
2. Take measurements at different times of the day.
3. Compare metrics dBm and channel congestion.

If after all checks the signal remains weak (-75 dBm and below), and the router is in another room, the only reliable solution is to lay a network cable or install a Mesh system.

FAQ: Frequently Asked Questions