When choosing a router for home, many people pay attention to the data transfer speed, the number of antennas or support for Mesh networks, but few people think about transmitter powerMeanwhile, it is this parameter that determines how stable the signal will be in distant rooms, whether Wi-Fi will penetrate concrete walls, and whether the router will "conflict" with neighboring networks. In this article, we'll look at how How to correctly measure the power of a Wi-Fi router, what values are considered normal for home use, and why an overly powerful transmitter can be just as bad as a weak one.
Power is measured in milliwatts (mW) or decibels-milliwatts (dBm), and these values are almost never indicated on the device's box. Manufacturers prefer to use terms like "high power" or "improved coverage", but specific numbers have to be looked up in technical specifications or configured manually. We'll show you how to do this without special equipment—using built-in router tools, mobile apps, and even the command line.
What is Wi-Fi router power and why should you check it?
Transmitter power (Tx Power) is the energy with which the router emits a signal. The higher it is, the further the network extends, but there are some nuances:
- 📶 Too much power may interfere with neighboring networks (especially in apartment buildings) and even violate local regulations (in Russia and the EU there are restrictions on the maximum power for household appliances).
- 🏠 Optimal value It depends on the size of the apartment: for a studio, 20–50 mW (13–17 dBm) will be enough, while for a country house, 100–200 mW (20–23 dBm) may be required.
- ⚡ Energy consumption: Routers with high power generate more heat and consume more electricity (this applies to models with active cooling).
In addition, power affects connection speedIf the signal is too weak, devices will constantly reconnect or operate at a reduced speed (for example, instead of the standard 866 Mbps 802.11ac you will get 150 Mbps, as in the old one 802.11n). On the other hand, excess power can lead to channel congestion and increased latency (ping).
Where is the router's power indicated: 3 sources of information
Manufacturers rarely display this parameter prominently, but it can be found in several places:
- Technical specifications on the manufacturer's website (chapter "Wireless" or "Radio Specifications"). Look for lines like "Transmit Power" or "Output Power" For example, ASUS RT-AX88U indicated: "28 dBm (63 mW) for 2.4 GHz, 23 dBm (20 mW) for 5 GHz".
- Sticker on the bottom of the routerSometimes there is a QR code with a link to a full description of the model or the standard is directly indicated (for example, "802.11ax, max 23 dBm").
- Documentation (paper instructions or PDF file included). In the section "Regulatory requirements" or "Certificates"Power limitations for different countries may be mentioned.
If none of the sources helped, there are two options left: measure the power yourself (more on that later) or contact the manufacturer's support team to request data for your model. Keep in mind that some brands (e.g., TP-Link or MikroTik) indicate the power only for certified versions of devices (marked "CE" or "FCC").
How to measure Wi-Fi router power via the web interface
Most modern routers allow you to view (and sometimes change) the transmitter power through the admin panel. The instructions are universal for most brands, but the settings may vary.
- Connect to your router via cable or Wi-Fi (it's better to use a wired connection for stability).
- Open your browser and enter your router's IP address into the address bar. This is usually
192.168.0.1,192.168.1.1or192.168.8.1(check the device sticker). - Enter your login and password (by default it is often
admin/adminoradmin/empty). - Go to the wireless network section. The paths may be:
- For TP-Link:
Wireless → Wireless Settings → Advanced(search for "Transmit Power"). - For ASUS:
Wireless → Professional(field "Tx Power Control"). - For MikroTik:
Wireless → Interfaces → [select network] → Advanced(parameter "Tx Power"). - For Keenetic:
Wi-Fi network → Access point → Additional(option "Transmitter power").
- For TP-Link:
Most routers display power as a percentage (e.g., "100%") or in dBm (e.g., "20 dBm"). To convert percentages to milliwatts, use the following table:
| Percentage (%) | Power (dBm) | Power (mW) |
|---|---|---|
| 25% | 5 dBm | 3.2 mW |
| 50% | 10 dBm | 10 mW |
| 75% | 15 dBm | 32 mW |
| 100% | 20 dBm | 100 mW |
What should I do if there is no "Transmit Power" option in the settings?
If there is no direct indication of power in the web interface, try:
1. Update your router firmware (sometimes new versions add hidden settings).
2. Use alternative firmware (for example, DD-WRT or OpenWRT, if your model is supported).
3. View power through Telnet/SSH (team iwconfig or iw list for Linux routers).
Power testing via mobile apps
If you don't want to mess around with your router settings, you can estimate the signal strength using your smartphone. Wi-Fi analyzer apps that display the signal level in dBm are suitable for this purpose (the closer the value is to 0, the stronger the signal; for example, -30 dBm - excellent signal, -70 dBm - weak).
Best apps for Android and iOS:
- 📱 WiFi Analyzer (Android) - shows a real-time signal strength graph and helps you choose the least congested channel.
- 📊 NetSpot (Android/iOS) — creates a heat map of coverage and displays the signal level at each point in the apartment.
- 🔍 AirPort Utility (iOS) - a built-in application from Apple that shows the signal level in dBm (you need to enable the "Wi-Fi Scanner" in the settings).
How to interpret the results:
- From -30 to -50 dBm: perfect signal, maximum speed.
- From -50 to -60 dBm: good signal, minor speed losses possible.
- From -60 to -70 dBm: weak signal, connection breaks possible.
- Below -70 dBm: there is practically no signal, you need to reconfigure the router or install a repeater.
Stand 1-2 meters away from the router|
Close all applications that consume internet |
Check the signal in 3-4 points of the apartment|
Compare performance at 2.4 GHz and 5 GHz frequencies-->
Important: Mobile apps display the signal strength reaching the device, not the router's output power. To estimate the actual transmitter power, you need to take into account losses due to distance and obstacles (walls, furniture).
Determining power via the command line (Windows/Linux/Mac)
For advanced users, there's a way to check signal strength via the command line. This method works on any device connected to a Wi-Fi network.
For Windows:
- Open Command Prompt (
Win + R→ entercmd→Enter). - Run the command:
netsh wlan show interfaces - Find the line "Signal" — the signal level will be shown there as a percentage. To convert it to dBm, use the formula:
dBm = -10 * log10(100 / percent)For example, if the signal is 70%, then
dBm = -10 * log10(100/70) ≈ -53 dBm.
For Linux/Mac:
- Open the terminal.
- Run the command (for Linux):
iwconfig wlan0 | grep Signalor (for Mac):
/System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -I - In the output, find the line with "signal" or "RSSI" — this is the signal power in dBm.
These commands show current signal level, not the router's maximum power. However, if you measure the signal near the router (at a distance of 0.5–1 meter), you can roughly estimate its strength. For example, if the signal near the router -40 dBm, and at a distance of 10 meters -65 dBm, then the loss is 25 dBm, which corresponds to typical household devices.
Comparing router power by Wi-Fi standards
The router's power depends not only on its hardware characteristics, but also on the supported Wi-Fi standard. Modern standards (802.11ac And 802.11ax) are more energy efficient and can provide better coverage with less power through technologies like MU-MIMO And Beamforming.
| Wi-Fi standard | Max. power (dBm) | Typical power (dBm) | Peculiarities |
|---|---|---|---|
| 802.11n (Wi-Fi 4) | 20–27 dBm | 17–20 dBm | High power compensates for low speed (up to 600 Mbps). |
| 802.11ac (Wi-Fi 5) | 23–30 dBm | 18–23 dBm | Supports Beamforming, which improves coverage at the same power. |
| 802.11ax (Wi-Fi 6/6E) | 20–24 dBm | 15–20 dBm | Lower power, but better coverage due to OFDMA and TWT. |
Interesting fact: routers Wi-Fi 6 (802.11ax) often have less powerthan models Wi-Fi 5, but provide better coverage due to more efficient use of spectrum. This is due to the technology TWT (Target Wake Time), which reduces power consumption and interference.
If you are choosing a router for a large home, pay attention to models that support Wi-Fi 6 And MU-MIMO — they allow you to connect multiple devices simultaneously without losing speed, even if the transmitter power is lower than that of older routers.
The Dangers of Too Much Power: Why More Isn't Always Better
Many users mistakenly believe that the more powerful a router is, the better. In reality, excess power can lead to the following problems:
- ⚡ Router overheating: high values Tx Power increase the load on the chip, which reduces the lifespan of the device.
- 📵 Interference with neighboring networksIn apartment buildings, powerful routers clog the airwaves, forcing neighbors to switch to less optimal channels.
- 🚫 Violation of regulatory norms: in Russia and the EU, the maximum permitted power for household appliances is 100 mW (20 dBm) at 2.4 GHz and 200 mW (23 dBm) at 5 GHz. Exceeding these values may result in fines (although in practice this is unlikely).
- 🔄 Performance degradation: If the power is too high, devices may not "hear" the router's responses due to channel congestion.
Therefore, before increasing the power in the settings, check:
- Is there any interference from neighboring networks (use apps like WiFi Analyzer).
- Is the router overheating? (If the case is hot, reduce the power to 70–80%).
- Does the speed deteriorate at maximum power (sometimes reducing it to 80% provides a more stable connection).
FAQ: Frequently Asked Questions about Wi-Fi Router Power
Is it possible to increase the router's power beyond the factory settings?
Technically yes, but it requires flashing alternative software (for example, DD-WRT or OpenWRT) and may violate local regulations. Furthermore, exceeding the power limit of 23–27 dBm often leads to overheating and network instability. In most cases, it is better to use repeaters or Mesh systems instead of increasing power.
Why is the signal at 5 GHz weaker than at 2.4 GHz, even if the power is the same?
The 5 GHz band has a shorter wavelength, so the signal has difficulty penetrating obstacles (walls, furniture). However, this band offers less interference and higher maximum speeds. If you need coverage over a large area, use both bands simultaneously (dual networking).
Which router should I choose for a 200 m² country house?
For a large area the following are suitable:
- Routers with support Wi-Fi 6 And 4×4 MU-MIMO (For example, ASUS RT-AX88U or TP-Link Archer AX6000).
- Mesh systems (For example, Google Nest WiFi or TP-Link Deco X60), which automatically switch devices between nodes.
- Routers with external antennas (For example, MikroTik RB4011), which can be directed to the desired areas.
The transmitter power must be within the limits 20–23 dBm (100–200 mW), but it is more important to correctly position the router (preferably in the center of the house).
Does router power affect internet speed?
Indirectly, yes. If the power is too low, devices will connect at a reduced speed (for example, instead of 866 Mbps, you'll get 150 Mbps). However, if the power is too high, interference and latency (ping) may increase, which will also reduce the actual speed. The optimal value is when the signal strength on the device is -50...-60 dBm.
Is it possible to measure the power of a router without connecting to it?
No, to get an accurate measurement, you need either the router's admin panel or a device connected to its network (smartphone, laptop). However, you can roughly estimate the power based on the router model by finding its specifications online (for example, on the website FCC or in reviews).