RF Power Milestone Verified: Low-Power RF Reference
-18 dBm to Watts
-18 dBm equals 1.5849e-5 Watts (0.016 mW). Real-world engineering benchmark: 15.85 µW calculated RF power level.
dBm
Reference Domain: Low-Power RF Reference
1.5849e-5 W
Milliwatts: 0.016 mW dBW: -48.00 dBW
Microwatts (μW)
15.85 μW
VRMS (@ 50Ω)
0.0282 V Peak-to-Peak (Vpp)
0.0796 V Voltage (dBμV)
89.0 dBμV
Exact Mathematical Derivation for -18 dBm
Step 1: P(mW) = 10^(-18 / 10) = 10^(-1.80) = 0.016 mW
Step 2: P(W) = 0.016 mW ÷ 1,000 = 1.5849e-5 Watts
Step 3: V_RMS (@ 50Ω) = √(1.585e-5 W × 50 Ω) = 0.0282 V RMS (89.0 dBμV)
Step 2: P(W) = 0.016 mW ÷ 1,000 = 1.5849e-5 Watts
Step 3: V_RMS (@ 50Ω) = √(1.585e-5 W × 50 Ω) = 0.0282 V RMS (89.0 dBμV)
Relative Delta Analysis
Adjacent Relative Power Comparisons
See how power changes when increasing or decreasing from -18 dBm by standard logarithmic step sizes:
| Delta (Δ dB) | Resulting Level (dBm) | Power in Watts | Milliwatts (mW) | Physical Effect |
|---|---|---|---|---|
| -10 dB | -28.0 dBm | 1.58 µW | 0.002 mW | 1/10th Power |
| -3 dB | -21.0 dBm | 7.94 µW | 0.008 mW | 1/2 Half Power |
| -1 dB | -19.0 dBm | 12.59 µW | 0.013 mW | -1 dB Attenuation |
| 0 dB | -18.0 dBm | 15.85 µW | 0.016 mW | Baseline Level |
| +1 dB | -17.0 dBm | 19.95 µW | 0.020 mW | +1 dB Increase |
| +3 dB | -15.0 dBm | 31.62 µW | 0.032 mW | 2× Double Power |
| +10 dB | -8.0 dBm | 158.49 µW | 0.158 mW | 10× Power |
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Knowledge Base
Frequently Asked Questions: -18 dBm
Common questions about RF power conversions, negative dBm, and voltage calculations.
-18 dBm is exactly 1.5849e-5 Watts, which equals 0.016 milliwatts (mW).
15.85 µW calculated RF power level. In RF telecommunications, this power level is standard for Low-Power RF Reference.
At 50 Ω impedance, -18 dBm produces 0.0282 V RMS, 0.0398 V Peak, 0.0796 Vpp, and 89.0 dBμV.
-18 dBm equals -48.00 dBW (calculated by subtracting the 30 dB milliwatt offset: -18 − 30).
Doubling the power (+3 dB) increases the level to -15.0 dBm, which equals 3.170e-5 W (0.032 mW).