dBµV ↔ V Voltage Conversion Table (with 50 Ω dBm)

Reference table of µV, mV, V and the equivalent 50 Ω dBm value from 0 to 140 dBµV.

EMI receiver readings and conducted emission limits are written in dBµV, while spectrum analyzers often display dBm. In a 50 Ω system dBµV = dBm + 107, so the two move directly into each other. That value is the last column of the table.

Voltage conversion table (10 dB steps; dBm at 50 Ω)

dBµV	µV	mV	V	dBm (50 Ω)
0	1	0.001	1×10⁻⁶	-107
10	3.162	0.003162	3.16×10⁻⁶	-97
20	10	0.01	1×10⁻⁵	-87
30	31.62	0.03162	3.16×10⁻⁵	-77
40	100	0.1	1×10⁻⁴	-67
50	316.2	0.3162	3.16×10⁻⁴	-57
60	1000	1	0.001	-47
70	3162	3.162	0.003162	-37
80	10000	10	0.01	-27
90	31620	31.62	0.03162	-17
100	100000	100	0.1	-7
110	316200	316.2	0.3162	3
120	1×10⁶	1000	1	13
130	3.16×10⁶	3162	3.162	23
140	1×10⁷	10000	10	33

dBµV

µV

dBm (50 Ω)

0.001

1×10⁻⁶

-107

3.162

0.003162

3.16×10⁻⁶

-97

0.01

1×10⁻⁵

-87

31.62

0.03162

3.16×10⁻⁵

-77

100

0.1

1×10⁻⁴

-67

316.2

0.3162

3.16×10⁻⁴

-57

1000

0.001

-47

3162

3.162

0.003162

-37

10000

0.01

-27

31620

31.62

0.03162

-17

100

100000

100

0.1

-7

110

316200

316.2

0.3162

120

1×10⁶

1000

130

3.16×10⁶

3162

3.162

140

1×10⁷

10000

Formula

Worth memorizing

120 dBµV = 1 V
60 dBµV = 1 mV
At 50 Ω, dBµV = dBm + 107
107 = 90 + 10·log₁₀(50)

Common mistakes

Using +107 regardless of impedance. It is specific to 50 Ω; at 75 Ω it is +108.75.
Using 10·log₁₀ for voltage. Voltage is an amplitude quantity, so it uses 20·log₁₀.
Treating the quasi-peak and peak readings as the same. For broadband noise the difference is large.
Forgetting the LISN division factor and insertion loss. Add the values from the calibration certificate to get the actual terminal voltage.

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Results and summaries are for reference. For certification and test reports use the latest official standard text and calibrated instrument data. Last updated: 2026-10-10