dBµA to mA Conversion Table (dBuA to µA, A, dBµV and dBm Chart)
dBµA (dBuA) to µA, mA and A reference chart from 0 to 140 dBµA in 10 dB steps, with the equivalent dBµV and dBm in a 50 Ω system.
dBµA is a current level referenced to 1 µA. Cable common-mode currents measured with a current probe, MIL-STD-461 CE101 limits and injected current in automotive BCI testing are all written in dBµA. The table runs from 0 to 140 dBµA in 10 dB steps; the last two columns give the voltage (dBµV) and power (dBm) when the same current flows through 50 Ω.
Current conversion table (10 dB steps; dBµV and dBm at 50 Ω)
| dBµA | µA | mA | A | dBµV (50 Ω) | dBm (50 Ω) |
|---|---|---|---|---|---|
| 0 | 1 | 0.001 | 1×10⁻⁶ | 33.98 | -73.01 |
| 10 | 3.162 | 0.003162 | 3.16×10⁻⁶ | 43.98 | -63.01 |
| 20 | 10 | 0.01 | 1×10⁻⁵ | 53.98 | -53.01 |
| 30 | 31.62 | 0.03162 | 3.16×10⁻⁵ | 63.98 | -43.01 |
| 40 | 100 | 0.1 | 1×10⁻⁴ | 73.98 | -33.01 |
| 50 | 316.2 | 0.3162 | 3.16×10⁻⁴ | 83.98 | -23.01 |
| 60 | 1000 | 1 | 0.001 | 93.98 | -13.01 |
| 70 | 3162 | 3.162 | 0.003162 | 103.98 | -3.01 |
| 80 | 10000 | 10 | 0.01 | 113.98 | 6.99 |
| 90 | 31620 | 31.62 | 0.03162 | 123.98 | 16.99 |
| 100 | 100000 | 100 | 0.1 | 133.98 | 26.99 |
| 110 | 316200 | 316.2 | 0.3162 | 143.98 | 36.99 |
| 120 | 1×10⁶ | 1000 | 1 | 153.98 | 46.99 |
| 130 | 3.16×10⁶ | 3162 | 3.162 | 163.98 | 56.99 |
| 140 | 1×10⁷ | 10000 | 10 | 173.98 | 66.99 |
Open the calculator → dBµA ↔ µA / mA / A Current Converter
Formula
I(µA) = 10^(I(dBµA) / 20)
I(dBµA) = 20·log₁₀(I(µA)) = 20·log₁₀(I(A)) + 120
dBµV = dBµA + 20·log₁₀(Z)
dBm = dBµA − 90 + 10·log₁₀(Z)
At 50 Ω: dBµV = dBµA + 34, dBm = dBµA − 73
Worth memorizing
- 0 dBµA = 1 µA (the reference)
- 60 dBµA = 1 mA
- 120 dBµA = 1 A
- Every +20 dB is ×10 current, every +6 dB is roughly ×2
- At 50 Ω, dBµV = dBµA + 34 and dBm = dBµA − 73
Common mistakes
- Using 10·log₁₀ for current. Current is an amplitude quantity, so like voltage it uses 20·log₁₀.
- Converting a current probe reading with the 50 Ω offset (dBµA = dBµV − 34). To get cable current from a receiver dBµV reading, subtract the probe transfer impedance Z_T in dBΩ instead.
- Treating dBµA and dBµA/m as the same thing. dBµA/m is magnetic field strength; dBµA is current in a conductor.
- Using +34 and −73 regardless of impedance. They apply only to 50 Ω; for other impedances change Z in the calculator.
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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: 2026-11-04