dBµV/m ↔ V/m Field Strength Conversion Table

Reference table of µV/m, mV/m and V/m from 0 to 140 dBµV/m in 10 dB steps.

Emission limits and measurements are written in dBµV/m while immunity test levels are written in V/m, so the same field strength has to be moved between the two units constantly. Field strength is an amplitude quantity, so the conversion uses 20·log₁₀.

Field strength conversion table (10 dB steps)

dBµV/m	µV/m	mV/m	V/m
0	1	0.001	1×10⁻⁶
10	3.162	0.003162	3.16×10⁻⁶
20	10	0.01	1×10⁻⁵
30	31.62	0.03162	3.16×10⁻⁵
40	100	0.1	1×10⁻⁴
50	316.2	0.3162	3.16×10⁻⁴
60	1000	1	0.001
70	3162	3.162	0.003162
80	10000	10	0.01
90	31620	31.62	0.03162
100	100000	100	0.1
110	316200	316.2	0.3162
120	1×10⁶	1000	1
130	3.16×10⁶	3162	3.162
140	1×10⁷	10000	10

dBµV/m

µV/m

mV/m

V/m

0.001

1×10⁻⁶

3.162

0.003162

3.16×10⁻⁶

0.01

1×10⁻⁵

31.62

0.03162

3.16×10⁻⁵

100

0.1

1×10⁻⁴

316.2

0.3162

3.16×10⁻⁴

1000

0.001

3162

3.162

0.003162

10000

0.01

31620

31.62

0.03162

100

100000

100

0.1

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/m = 1 V/m (the most useful anchor)
0 dBµV/m = 1 µV/m
10 V/m = 140 dBµV/m, 3 V/m ≈ 129.5 dBµV/m
Doubling the distance is −6 dB in the far field

Common mistakes

Using 10·log₁₀. Field strength is an amplitude quantity like voltage, so it uses 20·log₁₀.
Confusing µV/m with mV/m. The difference is a factor of 1000, which is 60 dB.
Treating the receiver reading as the field strength. Add the antenna factor and cable loss, and subtract the preamp gain.
Scaling the 3 m and 10 m limits with the distance formula. Use the values in the standard: CISPR 32 fixes the difference at 10 dB, not the calculated 10.46 dB.

Related calculators

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