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📶 Signal Strength Converter

RF power, signal level, field strength and signal quality conversions with space weather reference ranges

🌞 Space Weather Reference Ranges

Typical values of the solar and ionospheric indices that affect HF radio propagation. For today's actual values, check the NOAA Space Weather Prediction Center (swpc.noaa.gov).

0 – 200+
Sunspot Number (solar minimum to maximum)
65 – 250+
Solar Flux (SFU); above ~150 usually means good HF conditions
0 – 9
K-Index; 0–2 quiet, 5+ geomagnetic storm
10 – 35
MUF (MHz), typical daytime range

📡 Signal Interpretation

📡

Enter an RF power value to see how that signal level is typically rated.

Quick RF Power Conversions

0 dBm = 1 mW
Reference level
30 dBm = 1 W
Common transmit power
-70 dBm = 0.1 µW
Good WiFi signal
20 dBm = 100 mW
WiFi transmit power

Signal Level Examples

-50 dBm = 5 bars
Excellent signal
-70 dBm = 4 bars
Good signal
-85 dBm = 2 bars
Fair signal
-100 dBm = 1 bar
Poor signal

Field Strength Examples

1 V/m = 1000 mV/m
Strong local signal
100 mV/m = 100k µV/m
Good broadcast signal
1000 µV/m = 1 mV/m
Minimum usable signal
60 dBµV/m = 1000 µV/m
Broadcasting threshold

Signal Quality Benchmarks

10⁻⁶ BER = Excellent
High-quality digital link
1.5:1 VSWR = Good
Low reflection
2:1 VSWR = OK
Standard amateur radio
25% PER = Poor
Needs improvement

Signal Strength Meter

Enter signal above
Enter signal strength to see quality assessment

Link Budget Calculator

Enter parameters to calculate received signal strength

Signal Strength Examples

📶
Perfect Signal
-30 dBm
Excellent
📶
Great WiFi
-50 dBm
5 bars
📶
Reliable WiFi
-70 dBm
Good
📶
Minimum WiFi
-85 dBm
Fair
📶
Poor Signal
-100 dBm
1 bar
🗼
Cell Tower
30 dBm
1 Watt
⚡
Reference
0 dBm
1 mW
📲
Bluetooth
10 dBm
Class 1

Signal Strength Reference Table

Technology Excellent Good Fair Poor
WiFi 6E (6GHz) -30 to -50 dBm -50 to -60 dBm -60 to -70 dBm < -70 dBm
5G NR Sub-6 -50 to -75 dBm -75 to -85 dBm -85 to -95 dBm < -95 dBm
LTE Advanced -50 to -75 dBm -75 to -85 dBm -85 to -95 dBm < -95 dBm
Bluetooth 5.0 -30 to -50 dBm -50 to -60 dBm -60 to -70 dBm < -70 dBm