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Rojony Khatun Author
Rojony Khatun
CalculatorToolsProjectExpert
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Małgorzata Koperska, MD Steven Wooding
Last updated: August 15, 2025

DBm to RMS Voltage Calculator: Convert Power to Voltage

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dbm to rms voltage calculator

Convert dBm power levels to RMS voltage easily using impedance and power formulas. Ideal for RF engineers and audio signal analysis.

power to voltage calculator

Differentially convert power in dBm to RMS voltage: \( V_{\text{rms}} = \sqrt{R \times 10^{\frac{P_{\text{dBm}}}{10}} \times 10^{-3}} \) RF engineering and signal meaurements requires that power be known in dBm and then converted to dBm bilateral into RMS voltage.

Formula & Table Summary:

  • \(P_{\text{dBm}}\): Power in dBm
  • \(R\): Load impedance (ohms)
  • \(V_{\text{rms}}\): RMS voltage (volts)
  • dbm voltage calculator

    The DBm to RMS Voltage Calculator is used to calculate power levels in dBm (decibels relative to 1 milliwatt) to RMS voltage at a known impedance usually 50 ohms in RF or 600 ohms in audio use. The formula used to compare power, voltage and resistance allows engineers and technicians to use this calculator to translate dBm measurable voltages of signal strength or power readings more rapidly. The conversion plays an important role in falling into RF circuit design, audio signal processing and testing where voltage levels are to be obtained form power levels. Insert dBm of the power and the system impedance to obtain the equivalent RMS voltage of the power. The instrument makes the conversion of power to voltage easier and decreases the proportion of manual mistakes and improves the precision of measurement.

    saudio signal voltage cal

    Power (dBm)Impedance (Ω)Power (W)RMS Voltage (V)
    0500.0010.2236
    10500.010.7071
    -10500.00010.0707
    206000.12.449
    56000.003160.435

    Frequently Asked Questions - dbm to rms voltage calculator:

    What is dBm?

    dBm is a power level expressed in decibels relative to 1 milliwatt.

    How do you convert dBm to watts?

    Use P = 10^(PdBm/10) × 10^-3 watts.

    What is RMS voltage?

    Root Mean Square voltage represents the effective AC voltage.

    How is voltage calculated from power?

    Voltage is V_rms = sqrt(R × P) where R is resistance.

    What units are used for impedance?

    Impedance is measured in ohms (Ω).

    Can this calculator be used for audio signals?

    Yes, provided you input the correct impedance value.

    Is the formula valid for DC?

    No, it applies to AC/RF signals and power measurements.

    Why is impedance important?

    Impedance determines how voltage relates to power.

    What typical impedance is used in RF?

    50 Ω is standard for RF systems.

    What if I don't know impedance?

    Use the system’s characteristic impedance or measure it for accuracy.

    Rojony Khatun

    Rojony Khatun

    CalculatorToolsProject

    Rojony Khatun is the creator of a free online tools website designed to simplify everyday and engineering-related calculations for students, professionals, and hobbyists. The platform offers a wide variety of basic and advanced calculators across key categories, including Electrical Calculators, Electronic Calculators, and Time & Date Calculators, helping users solve problems quickly and accurately.