dBm ↔ Watt ↔ Vrms Converter

Enter any value to instantly convert between dBm, Watt, and Vrms.

Power Converter

Impedance (Z₀)

dBm decibel-milliwatts

dBm

Watt milliwatts shown below

Milliwatt

Vrms at selected impedance

V_rms

Vpp peak-to-peak (×2√2)

V_pp

Formulas

dBm → Watt

P(W) = 10^(dBm / 10) × 10⁻³

Watt → dBm

dBm = 10 × log₁₀(P(W)) + 30

Watt → Vrms

Vrms = √(P(W) × Z₀)

Vrms → Watt

P(W) = Vrms² / Z₀

Vrms → Vpp

Vpp = Vrms × 2√2 ≈ 2.8284

Vrms and Vpp conversions assume a sinusoidal waveform and require an impedance reference. 50 Ω is standard for RF; 75 Ω is common in broadcast and cable TV systems.