How to Check Wi-Fi Signal Strength on Your Computer: A Step-by-Step Guide

A weak Wi-Fi signal is one of the most common causes of slow internet, connection drops, and online game freezes. But how can you tell if the problem is signal strength, and not your ISP or router? Testing your computer's Wi-Fi strength takes less than a minute if you know the right tools and methods.

In this article we will look at 5 Ways to Measure Signal Strength — from built-in Windows and macOS tools to professional utilities. You'll learn what readings are considered normal, how to interpret them, and what to do if the signal is too weak. We'll also cover A hidden setting in Windows settings that shows the actual connection speed, not the abstract "bars" in the tray..

1. Checking the signal via the Wi-Fi icon in the tray (quick method)

The easiest way to assess signal strength is to look at the Wi-Fi icon in the lower right corner of the screen (in the notification area). In Windows, it appears as vertical stripes (from 1 to 5), and on macOS - in the form filled arcs.

However, this method has two critical flaws:

• 📶 Subjectivity: Three bars on one laptop may represent 70% of the signal, while on another, only 50%. Manufacturers use different visualization algorithms.
• 🔄 Update delay: The icon is updated every 10–30 seconds, so it won’t show sudden signal drops (for example, with a microwave or a neighbor’s router).

However, for primary diagnostics That's enough. If the icon shows 1-2 strips or cross, which means the signal is critically weak, and you need to move on to more precise methods.

2. Detailed information in the Network and Sharing Center (Windows)

Windows hides connection details in a menu that opens behind 2 clicksHere's how to get there:

1. Right-click on the Wi-Fi icon in the tray.
2. Select Open Network and Internet settings.
3. Scroll down and click Network and Sharing Center.
4. Click on the name of your Wi-Fi network (link next to Connections).

In the window that opens, you will see two key parameters:

• 📊 Speed ​​(Mbps): Current connection bandwidth (not to be confused with actual internet speed!). For example, 866 Mbps means that your adapter works in the standard Wi-Fi 5 (802.11ac).
• 📶 Signal quality: Displayed as a percentage or in words (Great, Fine, Weak). This is the very "signal level" we are looking for.

Name of the connected network|Connection speed (Mbps)|Signal quality (in %)|Connection duration (to see if there were any interruptions)-->

Important! If the value in the "Speed" column is lower 150 Mbps, your adapter operates in an outdated standard Wi-Fi 4 (802.11n) Or the router automatically reduced speed due to interference. This indirectly indicates a weak signal.

⚠️ Note: In Windows 11, the path to these settings may differ depending on the build version. If you can't find it Network and Sharing Center, use the system search or a combination Win + R → enter ncpa.cpl.

3. Command line: accurate data without third-party programs

For those who prefer maximum accuracy, the built-in utility will do netshIt shows the signal level in percent And decibels (dBm) — a unit of measurement used by professionals when setting up networks.

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

netsh wlan show interfaces

Find the block in the results SignalThere will be two key lines:

• 📈 Signal: 87% — the percentage ratio of the current signal to the maximum possible.
• 📡 Signal level: -55 dBm — the actual signal power in decibels. less number (modulo), the better. For example, -30 dBm - excellent signal, and -80 dBm - very weak.

If your signal is lower -70 dBm, it's worth thinking about strengthening the coating — for example, move the router or install a repeater.

4. Wi-Fi Monitoring Software: From Simple to Professional

Standard Windows and macOS tools provide basic information, but for deep analysis It's better to use specialized utilities. They show not only the signal level, but also channels, interference, neighboring networks and even optimization recommendations.

Here are the top 5 programs for different tasks:

• 🖥️ WiFi Analyzer (Windows): A free utility that visualizes all the networks around you. Shows channel congestion and helps to choose the freest one.
• 🍎 Wireless Diagnostics (macOS): A built-in app from Apple. Launched by holding down a key. Option + click on the Wi-Fi icon.
• 📊 inSSIDer (Windows/macOS): Paid program for professionals. Analyzes real-time signal strength and builds graphs.
• 🔍 Acrylic Wi-Fi (Windows): Shows hidden networks and supports coverage maps (heatmap).
• 🐧 LinSSID (Linux): An inSSIDer analogue for Linux. Works via a terminal or graphical interface.

For most users it will be enough WiFi Analyzer or Wireless DiagnosticsThese programs do not require installation (portable versions) and show:

• 📡 All available networks and their SSID.
• 📶 Signal level in dBm for each network.
• 🔄 Channel and its load (the fewer networks on the channel, the better).
• 🔒 Encryption type (WPA2, WPA3).

How to read a channel graph in WiFi Analyzer?

The colored bars represent networks on different channels. The higher the bar, the stronger the signal. If your channel (for example, 6) has many high bars, it means there's interference. It's best to switch to a channel with minimal congestion (for example, 1 or 11 for 2.4 GHz).

Important! If you see that your router is working on the channel 13 (in the 2.4 GHz range), but there are many networks nearby on the channels 1–11This could be the reason for the weak signal. In some countries, channel 13 is blocked, and devices automatically reduce their power.

5. Checking on macOS: Hidden System Features

Apple hid detailed Wi-Fi information under a layer of abstraction, but it can be accessed. in two ways:

Method 1: Hold Option + click the Wi-Fi icon

Hold down the key Option (⌥) and click the Wi-Fi icon in the top bar. An expanded menu with the following data will appear:

• 📶 RSSI — signal level in decibels (analogue dBm in Windows).
• 🔄 Tx Rate — current data transfer rate.
• 📡 Channel — the channel used.

Method 2: Wireless Diagnostics

This is a built-in diagnostic utility. To open it:

1. Hold Option (⌥) and click on the Wi-Fi icon.
2. Select Open Wi-Fi diagnostics.
3. Enter the administrator password (if required).
4. In the top menu, click Window → Scan (or Window → Scan (in Russian).

The program will show all networks within range, their signal level, channels and even optimization recommendations (for example, change the channel or switch to 5 GHz).

⚠️ Attention: On MacBooks with chips Apple Silicon (M1/M2) Some Wireless Diagnostics features may work differently. If you don't see the tab Scan, update macOS to the latest version.

6. Linux: Terminal Commands for Advanced Users

In Linux, signal strength is checked through the terminal. The most useful commands are:

1. View the current connection:

iwconfig

Look for the line Signal level=-58 dBmThe closer the number is to zero (in absolute value), the better.

2. Scan all networks:

sudo iwlist wlan0 scan | grep -E "ESSID|Signal"

This command will list all networks (ESSID) and their signal level (Signal level).

3. Real-time monitoring:

watch -n 1 "cat /proc/net/wireless"

Updates signal data every second. Useful for monitoring drawdowns.

For visualization you can use LinSSID or Wavemon (installed through apt or pacman). These programs show:

• 📡 Signal level graph over time.
• 📊 Channel congestion.
• 🔒 Wi-Fi encryption type and standards (802.11n/ac/ax).

7. What to do if the signal is weak: 5 practical tips

If the test shows that the signal level is lower -70 dBm or the percentage value is less 50%, try these methods:

• 📍 Move the router: The optimal place is center of the apartment, at a height of 1–1.5 meters. Avoid closed cabinets and concrete/metal walls.
• 🔄 Change the channel: In the range 2.4 GHz choose channels 1, 6 or 11 (they do not intersect). 5 GHz use channels with numbers 36–48 or 149–165.
• 📶 Update your router firmware: Outdated software may limit transmission power. Check for updates in the router's web interface (192.168.1.1 or 192.168.0.1).
• 🔌 Use a repeater: Devices like TP-Link RE605X or Xiaomi Wi-Fi Repeater 2 enhance the signal in "dead zones".
• 🖧 Change your router antennas: Stock antennas are often weak. Replace them with reinforced (For example, TP-Link TL-ANT2408CL with a coefficient 8 dBi).

If nothing helps, consider transition to a mesh system (For example, Google Nest Wi-Fi or ASUS ZenWiFi). It automatically switches devices between nodes, ensuring stable coverage.

⚠️ Note: Some routers (especially those from ISPs) artificially limit transmission power. If your router is rented, contact technical support and ask them to remove the limitation or replace the equipment.

FAQ: Frequently asked questions about checking your Wi-Fi signal

🔍 Why is the signal on my phone better than on my computer?

This is related to differences in Wi-Fi adaptersModern smartphones (for example, iPhone 15 or Samsung Galaxy S23) are equipped with adapters Wi-Fi 6E with support 6 GHz, while many laptops still use Wi-Fi 5 (802.11ac). Additionally, antennas in phones are often located closer to the top of the case, where there is less interference from the battery.

📶 Can you boost your Wi-Fi signal with foil?

Theoretically yes, but the effect is minimalThe foil acts as reflector, directing the signal in one direction, but blocking it in other directions. For a noticeable improvement, special reflectors (For example, Wi-Fi Blaster) or replacing antennas. It's better to spend time optimizing the router's location.

🖥️ Why does the signal level jump from -50 dBm to -80 dBm?

Sharp signal surges are usually caused by:

1. Interference from other devices (microwaves, cordless phones, neighboring routers).
2. Automatic channel switching (if the router is enabled Auto Channel).
3. Problems with the adapter power supply (on laptops, check your power settings).

To stabilize the signal, manually fix the channel in the router settings and disable power saving for the Wi-Fi adapter in Device Manager.

🔌 How to check the Wi-Fi signal on a PC without a Wi-Fi adapter (via cable)?

If your computer is connected to the router via Ethernet, but you want to check the level Wi-Fi signal from the router (for example, to diagnose a coating), use:

• 📱 Smartphone with the application Wi-Fi Analyzer.
• 🖥️ Another laptop or tablet with Wi-Fi.
• 🔧 Built-in router tools (some models have them in the web interface) Wi-Fi Analyzer).

You can also connect USB Wi-Fi adapter (For example, TP-Link TL-WN725N) and use it for scanning.

🛠️ Can antivirus software affect Wi-Fi signal strength?

No, Antivirus software does not affect the physical signal level., but maybe limit the speed because of:

• 🛡️ Traffic scanning (for example, in Kaspersky or ESET).
• 🔄 Blocking suspicious packets (especially on public networks).
• 🖥️ Conflicts with drivers Wi-Fi adapter (rare).

If you suspect an antivirus, temporarily disable it and check the speed through speedtest.netIf there is no difference, the problem is not with him.