Mobile Signal Strength dBm Converter & Network Speed Estimator
📶 Mobile Signal Strength dBm Converter
iPhone: Dial *3001#12345#* and press call (Field Test Mode).
Android: Settings → About Phone → Status → SIM Status.
Understand Your Mobile Signal Like a Pro
The MSB dBm Converter is an easy-to-use online tool designed to help you interpret your mobile signal strength (measured in dBm) and estimate your network performance on both LTE (4G) and 5G networks. Whether you’re troubleshooting weak reception at home or optimizing antenna placement for a signal booster, this tool instantly gives you an accurate signal quality verdict, visual signal bars, and expected internet speeds.
How the Tool Works
Simply enter your phone’s signal strength in dBm (for example: -85 dBm) into the converter. The tool automatically tells you whether your signal is Excellent, Good, Fair, or Poor, and provides a realistic speed range for your 4G LTE and 5G networks.
Steps:
Find your dBm value:
📱 iPhone: Dial
*3001#12345#*and press call (opens Field Test Mode).🤖 Android: Go to Settings → About Phone → Status → SIM Status.
Enter the dBm value (e.g., -85).
Click “Check” to view your signal quality, bar strength, and network speed estimate.
What the Results Mean
| Signal Verdict | dBm Range | Signal Bars | Typical Performance |
|---|---|---|---|
| Excellent | -70 dBm or better | 🔹🔹🔹🔹 | Very strong signal — fast data, clear calls |
| Good | -85 dBm to -70 dBm | 🔹🔹🔹 | Stable calls, decent browsing |
| Fair | -100 dBm to -85 dBm | 🔹🔹 | Calls may drop occasionally, slow data |
| Poor | Below -100 dBm | 🔹 | Very weak — consider a signal booster |
Network Speed Estimates
Depending on your signal quality, here’s what to expect from LTE (4G) and 5G networks:
| Signal Quality | LTE (4G) Speed | 5G Speed |
|---|---|---|
| Excellent | 30–50 Mbps (DL), 10–20 Mbps (UL) | 200–1000 Mbps (DL), 30–100 Mbps (UL) |
| Good | 10–30 Mbps (DL), 5–10 Mbps (UL) | 100–200 Mbps (DL), 20–50 Mbps (UL) |
| Fair | 2–10 Mbps (DL), 1–5 Mbps (UL) | 30–100 Mbps (DL), 10–30 Mbps (UL) |
| Poor | <2 Mbps (DL), <1 Mbps (UL) | <30 Mbps (DL), <10 Mbps (UL) |
(DL = Download speed, UL = Upload speed)
Why Knowing Your dBm Value Matters
Helps identify poor coverage areas in your home, office, or RV.
Assists in choosing the right spot for your signal booster antenna.
Enables you to compare the true strength of LTE vs 5G networks.
Lets you diagnose slow internet issues before contacting your carrier.
Unlike “bars” on your phone, dBm gives a precise, scientific measurement of signal strength — making it ideal for technicians, installers, and everyday users alike.
Best Use Cases
Homeowners checking where to mount their cell booster antenna.
RV or camper users optimizing mobile connectivity on the road.
Field engineers or installers needing accurate dBm readings.
Tech enthusiasts testing network performance consistency.