dBm to Voltage Calculator Online

dBm measures power levels relative to 1 milliwatt, and voltage is a fundamental electrical measurement indicating the potential difference between two points. The dBm to Voltage Calculator facilitates the conversion from a power measurement in dBm to its corresponding voltage, making it invaluable in settings where precise electrical outputs are required.

Formula of dBm to Voltage Calculator

The formula for converting dBm to voltage is given by:

Where:

• V(rms) is the root-mean-square voltage in Volts (V),
• P(dBm) represents the power level in dBm,
• Z stands for the impedance of the system in Ohms (Ω).

To understand this formula:

1. Convert dBm to linear power (milliwatts) by using the expression 10^(dBm/10).
2. Transform milliwatts to watts by multiplying by 0.001.
3. Incorporate the impedance (Z) to establish the relationship between power and voltage.
4. Calculate the square root of the resulting product to determine the RMS voltage.

Conversion Table

dBm Value	Linear Power (Watts)	Voltage (RMS)
-40 dBm	0.00001 W	0.000707 V
-30 dBm	0.0001 W	0.00224 V
-20 dBm	0.001 W	0.00707 V
-10 dBm	0.01 W	0.0224 V
0 dBm	0.001 W	0.0707 V
10 dBm	0.1 W	0.224 V
20 dBm	1 W	0.707 V
30 dBm	10 W	2.24 V
40 dBm	100 W	7.07 V

Example of dBm to Voltage Calculator

Consider a scenario where you need to convert -30 dBm to voltage in a system with 50 Ω impedance:

1. Calculate linear power: P = 10^(-30/10) * 0.001 = 0.001 milliwatts.
2. Convert to watts: 0.001 milliwatts = 0.000001 watts.
3. Apply the formula: V(rms) = sqrt(0.000001 watts * 50 Ω) = 0.0002236 volts.

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