RF Power Milestone Verified: Low-Power RF Reference
-8 dBm to Watts
-8 dBm equals 1.5849e-4 Watts (0.158 mW). Real-world engineering benchmark: 158.5 µW calculated RF power level.
dBm
Reference Domain: Low-Power RF Reference
1.5849e-4 W
Milliwatts: 0.158 mW dBW: -38.00 dBW
Microwatts (μW)
158.49 μW
VRMS (@ 50Ω)
0.0890 V Peak-to-Peak (Vpp)
0.2518 V Voltage (dBμV)
99.0 dBμV
Exact Mathematical Derivation for -8 dBm
Step 1: P(mW) = 10^(-8 / 10) = 10^(-0.80) = 0.159 mW
Step 2: P(W) = 0.159 mW ÷ 1,000 = 1.5849e-4 Watts
Step 3: V_RMS (@ 50Ω) = √(1.585e-4 W × 50 Ω) = 0.0890 V RMS (99.0 dBμV)
Step 2: P(W) = 0.159 mW ÷ 1,000 = 1.5849e-4 Watts
Step 3: V_RMS (@ 50Ω) = √(1.585e-4 W × 50 Ω) = 0.0890 V RMS (99.0 dBμV)
Relative Delta Analysis
Adjacent Relative Power Comparisons
See how power changes when increasing or decreasing from -8 dBm by standard logarithmic step sizes:
| Delta (Δ dB) | Resulting Level (dBm) | Power in Watts | Milliwatts (mW) | Physical Effect |
|---|---|---|---|---|
| -10 dB | -18.0 dBm | 15.85 µW | 0.016 mW | 1/10th Power |
| -3 dB | -11.0 dBm | 79.43 µW | 0.079 mW | 1/2 Half Power |
| -1 dB | -9.0 dBm | 125.89 µW | 0.126 mW | -1 dB Attenuation |
| 0 dB | -8.0 dBm | 158.49 µW | 0.158 mW | Baseline Level |
| +1 dB | -7.0 dBm | 199.53 µW | 0.200 mW | +1 dB Increase |
| +3 dB | -5.0 dBm | 316.23 µW | 0.316 mW | 2× Double Power |
| +10 dB | +2.0 dBm | 0.0016 W | 1.585 mW | 10× Power |
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Knowledge Base
Frequently Asked Questions: -8 dBm
Common questions about RF power conversions, negative dBm, and voltage calculations.
-8 dBm is exactly 1.5849e-4 Watts, which equals 0.159 milliwatts (mW).
158.5 µW calculated RF power level. In RF telecommunications, this power level is standard for Low-Power RF Reference.
At 50 Ω impedance, -8 dBm produces 0.0890 V RMS, 0.1259 V Peak, 0.2518 Vpp, and 99.0 dBμV.
-8 dBm equals -38.00 dBW (calculated by subtracting the 30 dB milliwatt offset: -8 − 30).
Doubling the power (+3 dB) increases the level to -5.0 dBm, which equals 3.170e-4 W (0.317 mW).