RF Power Milestone Verified: Cellular / IoT
-120 dBm to Watts
-120 dBm equals 1.0000e-15 Watts (1.000e-12 mW). Real-world engineering benchmark: Narrowband IoT (NB-IoT) / LTE Cell Edge.
dBm
Reference Domain: Cellular / IoT
1.0000e-15 W
Milliwatts: 1.000e-12 mW dBW: -150.00 dBW
Microwatts (μW)
1.00e-9 μW
VRMS (@ 50Ω)
0.00 mV Peak-to-Peak (Vpp)
0.00 mV Voltage (dBμV)
-13.0 dBμV
Exact Mathematical Derivation for -120 dBm
Step 1: P(mW) = 10^(-120 / 10) = 10^(-12.00) = 1.0000e-12 mW
Step 2: P(W) = 1.0000e-12 mW ÷ 1,000 = 1.0000e-15 Watts
Step 3: V_RMS (@ 50Ω) = √(1.000e-15 W × 50 Ω) = 0.00 mV RMS (-13.0 dBμV)
Step 2: P(W) = 1.0000e-12 mW ÷ 1,000 = 1.0000e-15 Watts
Step 3: V_RMS (@ 50Ω) = √(1.000e-15 W × 50 Ω) = 0.00 mV RMS (-13.0 dBμV)
Relative Delta Analysis
Adjacent Relative Power Comparisons
See how power changes when increasing or decreasing from -120 dBm by standard logarithmic step sizes:
| Delta (Δ dB) | Resulting Level (dBm) | Power in Watts | Milliwatts (mW) | Physical Effect |
|---|---|---|---|---|
| -10 dB | -130.0 dBm | 0.00 µW | 0.000 mW | 1/10th Power |
| -3 dB | -123.0 dBm | 0.00 µW | 0.000 mW | 1/2 Half Power |
| -1 dB | -121.0 dBm | 0.00 µW | 0.000 mW | -1 dB Attenuation |
| 0 dB | -120.0 dBm | 0.00 µW | 0.000 mW | Baseline Level |
| +1 dB | -119.0 dBm | 0.00 µW | 0.000 mW | +1 dB Increase |
| +3 dB | -117.0 dBm | 0.00 µW | 0.000 mW | 2× Double Power |
| +10 dB | -110.0 dBm | 0.00 µW | 0.000 mW | 10× Power |
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Knowledge Base
Frequently Asked Questions: -120 dBm
Common questions about RF power conversions, negative dBm, and voltage calculations.
-120 dBm is exactly 1.0000e-15 Watts, which equals 1.0000e-12 mW.
Narrowband IoT (NB-IoT) / LTE Cell Edge. In RF telecommunications, this power level is standard for Cellular / IoT.
At 50 Ω impedance, -120 dBm produces 0.00 mV RMS, 0.00 mV Peak, 0.00 Vpp, and -13.0 dBμV.
-120 dBm equals -150.00 dBW (calculated by subtracting the 30 dB milliwatt offset: -120 − 30).
Doubling the power (+3 dB) increases the level to -117.0 dBm, which equals 2.000e-15 W (2.000e-12 mW).