How many dBm are needed for Wi-Fi to function properly: Optimal signal strengths

Have you ever noticed how your internet speed suddenly drops in the far corner of your apartment, even though your router is literally in the next room? Or why video calls start stuttering, even though your smartphone shows a "full signal"? The reason is often not your provider's plan, but rather Wi-Fi signal level, which is measured in dBm (decibel milliwatt). This parameter indicates how "strong" or "weak" the signal is reaching your device, and it directly affects the stability of the connection.

In this article we will figure out, What signal level in dBm is considered normal for different Wi-Fi usage scenarios? — from watching videos on a smartphone to online gaming on a PC. You'll learn how to measure signal strength yourself, what to do if the values ​​are below optimal, and why even a "good" signal in -50 dBm It can slow down. And also, why do some devices "see" the network worse than others, even when located right next to the router?

What is dBm and how does it affect Wi-Fi?

dBm (decibel milliwatt) is a logarithmic unit of signal strength that indicates how strong or weak your device is at Wi-Fi reception. It's important to understand that dBm values ​​are always negative: the closer the number is to zero (for example, -30 dBm), the stronger the signal. And the larger the modulus of the number (for example, -90 dBm), the weaker.

Here's a simple analogy: imagine a Wi-Fi signal as the light of a flashlight. At a distance of 1 meter from it, the illumination is maximum (for example, -30 dBm), and at the end of the corridor the light is barely noticeable (-85 dBm). At the same time connection quality depends not only on signal strength, but also from:

• 📶 Wi-Fi frequencies: 2.4 GHz penetrates walls better, but is susceptible to interference; 5 GHz is faster, but has less penetration through obstacles.
• 📱 Receiver sensitivity: smartphone iPhone 15 can "catch" a signal on -75 dBm, and the old laptop is only on -65 dBm.
• 🚪 Obstacles: concrete wall weakens the signal 10–20 dBm, and the metal cabinet - up to 30 dBm.
• 🔄 Channel congestion: even if -50 dBm The speed may drop if the channel is occupied by neighboring networks.

Key point: dBm only shows signal strength, not internet speed.For example, when -60 dBm you can get and 10 Mbps, And 300 Mbps — it all depends on the Wi-Fi standard (802.11n/ac/ax), channel width and other parameters.

Optimal dBm values ​​for different tasks

There's no universal "ideal" dBm value—it all depends on what you're using Wi-Fi for. Below is a table with recommended ranges for specific scenarios:

⚠️ Attention: These values ​​are valid for modern devices (Wi-Fi 5/6). Older devices (such as 802.11g routers or smartphones from the 2010s) may require a higher signal strength (-55 dBm and higher) for stable operation.

Also keep in mind that Router manufacturers often overstate the declared transmission powerFor example, if the box says “20 dBm power,” the actual signal at a distance of 10 meters through two walls may be -70 dBm instead of expected -60 dBm.

How to measure Wi-Fi signal strength in dBm

You can check signal strength on both computers and mobile devices. Here are the most reliable methods:

On Windows

1. Click Win + X and select Terminal (Windows PowerShell).
2. Enter the command:

   netsh wlan show interfaces | find"Signal"

   The response will contain a string like this: Signal: 85% — this is a percentage, not dBm. For accurate data, use third-party utilities.

3. Install the program inSSIDer or NetSpot - They will show the signal level in dBm for all available networks.

On macOS

Hold down the key Option (⌥) and click on the Wi-Fi icon in the menu bar. A column will appear in the drop-down list RSSI — this is the signal level in dBm.

On Android

The default Android settings do not show dBm, but you can:

• 📱 Use apps like WiFi Analyzer or NetX Network Tools.
• 🔍 In the engineering menu (code ##4636##) choose Wi-Fi information - there will be a field there Wi-Fi signal strength.

On iOS

Apple has hidden the dBm display in recent versions of iOS, but there is a workaround:

1. Install the application AirPort Utility (official from Apple).
2. Enable the mode in the application settings Wi-Fi Scanner (may not work in some regions).
3. Or use third-party utilities, for example, Network Analyzer.

⚠️ Attention: Readings may vary by 5–10 dBm depending on the program and device model. For accurate measurements, use professional analyzers, such as Ekahau Sidekick.

Why the signal may be weak even near the router

The situation when the smartphone shows -75 dBm a meter from the router, and the laptop is nearby - -45 dBm, occurs frequently. The reasons may be as follows:

• 📡 Different antennas: Laptops usually have more sensitive receivers than smartphones. For example, MacBook Pro "catches" the signal on -70 dBm, A Redmi Note 12 - only on -60 dBm.
• 🔋 Energy savingMany devices automatically reduce Wi-Fi power to save battery life. Disable "Power Saving" mode in the settings.
• 📶 Incompatibility of standards: if the router is operating in mode 802.11ax (Wi-Fi 6), and your smartphone only supports 802.11ac, the signal can be “cut” up to -10 dBm.
• 🛡️ Interference from other devices: Microwaves, wireless headphones, and even USB 3.0 hubs create noise in the 2.4 GHz range.

Another common problem is - incorrectly configured router. For example:

• The channel width is set to 40 MHz, but in a densely populated area this causes interference. Try switching to 20 MHz.
• The mode is on 802.11b/g/n instead of 802.11n/ac, which limits speed and reduces stability.
• The transmission power (TX Power) in the router settings is reduced to 50% (sometimes providers do this by default).

🔹 How to check: Go to the router's web interface (usually at 192.168.1.1 or 192.168.0.1) and find the section Wireless Settings or Wi-FiView the current channel, bandwidth, and standard settings.

How do I know which Wi-Fi channel is the freest?

Open the program WiFi Analyzer on Android or NetSpot On your PC. The "Channel Rating" or "Channel Graph" section will show which channels are busy and which are free. Choose the one with the least overlap with neighboring networks.

How to Improve Your Wi-Fi Signal: Practical Tips

If measurements show that the signal level in the area of ​​use is lower -67 dBm, try the following methods:

1. Optimizing the router location

• 📍 Put the router in center of the apartment, and not in the corner by the window.
• 🚫 Avoid placing near metal objects (refrigerator, battery), mirrors And aquariums (water absorbs the signal).
• ⬆️ Raise the router 1–1.5 meters from the floor to ensure more even signal distribution.

2. Configuring the router

Change the Wi-Fi channel to the least crowded one|Set the channel width to 20/40 MHz (for 2.4 GHz) or 80 MHz (for 5 GHz)|Disable 802.11b mode to increase speed|Enable WPA3 (if supported)|Update the router firmware-->

3. Use of additional equipment

If the above methods do not help, consider:

• 📶 Wi-Fi repeater: Boosts signal but reduces speed by 30-50%. Suitable for small homes.
• 🔄 Mesh system: multiple access points that automatically switch devices between each other (for example, TP-Link Deco or Google Nest Wi-Fi).
• 🔌 Powerline adapters: They transmit internet through electrical wiring and then distribute it via Wi-Fi. They are useful if the router and devices are separated by thick walls.

⚠️ Attention: Before purchasing amplifiers, check if your router supports the modes WDS (for repeaters) or 802.11r/k/v (for mesh systems). Incompatible hardware may worsen the situation.

Common Mistakes When Boosting Wi-Fi Signals

Many users try to improve their Wi-Fi coverage, but make mistakes that only make the situation worse. Here's what it's not worth doing:

• 🔄 Set the maximum transmit power (TX Power) on the router. This increases interference to neighboring networks and can lead to channel congestion.
• 📡 Use homemade antennas or amplifiers Without certification, they could violate the law (in some countries, Wi-Fi power is strictly regulated) and burn out the router's transmitter.
• 🔌 Connecting too many devices to one repeaterThis creates a bottleneck and slows down the entire network.
• 🔍 Ignore router firmware updatesNew versions often fix bugs that affect signal stability.

Another common mistake is use of outdated safety standards. For example, if your router is operating in mode WEP or WPA, this is not only unsafe, but also reduces speed by 20-40%. Switch to WPA2-PSK or WPA3.

🔹 How to check: Find the section in your router settings Wireless Security or Wi-Fi Security. If it is indicated there WEP or WPA-TKIP, please update your settings immediately.

FAQ: Answers to Frequently Asked Questions

My router shows a signal of -80 dBm, but the internet works. Is this normal?

Technically, the network can work even with -80 dBm, but this critically low levelYou are most likely faced with:

• Frequent connection breaks.
• By reducing the speed to 1–5 Mbps.
• Problems with connecting some devices (for example, smart speakers or IP cameras).

We recommend improving coverage (see section above) or using a wired connection (Ethernet or Powerline).

Why is the signal on the iPhone -50 dBm, and on the laptop -70 dBm in the same place?

This is related to:

1. Different sensitivity of Wi-Fi modules: at iPhone Typically more modern and sensitive antennas than those found in budget laptops.
2. Different Wi-Fi standards: if the laptop only supports Wi-Fi 4 (802.11n), and the iPhone is Wi-Fi 6 (802.11ax), then the first one will “catch” the signal worse.
3. Energy saving settingsWindows often reduces the power of your Wi-Fi adapter to save battery life.

Try manually setting your laptop to the preferred 5 GHz network (if your router supports it) or updating your Wi-Fi adapter driver.

What signal strength is needed for online gaming?

For comfortable play (for example, in CS:GO, Fortnite or Valorant) recommended:

• Minimum signal level: -60 dBm (at 5 GHz).
• Optimal level: -50 dBm and above.
• Ping: up to 30 ms (at -65 dBm ping can "jump" up to 100+ ms).

If the signal is weaker -65 dBm, connect via cable or use a mesh system. Also, disable it in your router settings. QoS (if enabled) - sometimes it doesn't prioritize traffic correctly.

Is it possible to increase the router power above the standard 100 mW (20 dBm)?

Technically yes, but:

• 📛 In most countries (including Russia, EU, USA) maximum allowed power for Wi-Fi — 100 mW (20 dBm) for 2.4 GHz and 200 mW (23 dBm) for 5 GHz. Exceeding this limit may be considered a violation.
• ⚡ Increased power does not always improve coverage, but it definitely increases interference for neighboring networks.
• 🔥 Risk of overheating and failure of the router transmitter.

Better use it external antennas with gain (For example, TP-Link TL-ANT2408CL) or Mesh system.

Why is the Wi-Fi signal weaker at night?

This may be due to:

• 🌙 Changing interference: At night, some neighbors turn off their routers, and your device may automatically switch to a less optimal channel.
• 🔄 Planned work by the provider: Some operators reduce speed at night for maintenance.
• 📡 DNS server overloadIf your router uses your ISP's DNS, it may be slower at night. Try changing your DNS to 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).

Check your signal strength during the day and night using WiFi AnalyzerIf the difference is greater 10 dBm, the problem is most likely external interference.