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Fundamentals

dBμV and Voltage Converter

Convert bidirectionally between dBμV, V, mV, and μV.

FORMULAv1.1.0
INPUT PARAMETERS

Choose conversion direction

0 dBμV corresponds to 1 μV. dBμV is a voltage level with an explicit reference.

CALCULATION RESULT

Calculation result

Calculated locally
∿

Enter the parameters and run the calculation to see results and model assumptions here.

FORMULA & TRACEABILITY

Formulas and applicability

Formulas, variables, and model boundaries are published. References last reviewed on 2026-08-30.

4 formulas · 3 references
CORE EQUATIONS

Core equations

These equations directly produce the primary results and define the tool’s core model.

2
F01

Voltage level

Lᵥ = 20 log₁₀(V / V₀)

Voltage is a field/amplitude quantity; a reference of the same physical quantity forms a dimensionless ratio.

Lᵥ
Voltage leveldB
V
RMS voltageV
V₀
Reference voltageV
Applicability
  • V and V₀ must be the same kind of quantity
  • The reference value must be stated
  • Both use the same RMS convention
F02

Definition of dBμV

dBμV = 20 log₁₀(V / 1 μV)

0 dBμV corresponds to 1 μV; the unit is common for EMC receiver readings and limits.

V
RMS voltageV 或 μV
Applicability
  • Reference voltage fixed at 1 μV
  • The reference quantity must not be omitted
  • No automatic conversion is made among RMS, peak, and peak-to-peak values
DERIVED & CONVERSION

Derived and conversion equations

Derive units, levels, and supporting engineering quantities from the core values.

2
F03

Voltage from dBμV

V = 1 μV × 10^(dBμV / 20)

Recover linear voltage from a logarithmic level.

V
RMS voltageV
Applicability
  • Input level is referenced to 1 μV
F04

Common voltage-reference offsets

dBV = dBμV − 120；dBmV = dBμV − 60

Fixed offsets between the 1 V, 1 mV, and 1 μV voltage references.

Applicability
  • All three are voltage-amplitude levels
  • Not equivalent to the impedance-dependent dBm power unit
REFERENCES

References

01NIST · NIST SP 811NIST Guide to the SI, Chapter 8: Logarithmic quantities and units2008 (web edition updated) · Defines 20 lg(F/F₀) dB for field quantities and requires the reference quantity to be stated.
02IEC · IEC 60027-3:2002Letter symbols — Logarithmic and related quantities, and their units2002 · International standard basis for logarithmic quantities, units, and symbols.
03IEC/CISPR · CISPR 16-1-1:2019Radio disturbance and immunity measuring apparatus — Measuring apparatus2019 · Foundational standard context for EMC receivers and disturbance-measurement equipment.
Engineering use notice

Results use the models and assumptions shown on this page for design estimates and pre-compliance risk review. Complex structures, dispersion, near-field coupling, and test setup can cause significant deviation.

FAQ

Frequently asked questions

How do I convert between dBμV and voltage?

U(dBμV) = 20·log₁₀(U / 1 μV). 0 dBμV = 1 μV, 60 dBμV = 1 mV, and 120 dBμV = 1 V.

Why do EMC limits use dBμV?

CISPR and GB conducted-emission limits are expressed in dBμV; receiver readings are naturally logarithmic with a 1 μV reference, which is convenient across many orders of magnitude.

How do dBμV and dBm relate?

The system impedance must be known. In a 50 Ω system, P(dBm) ≈ U(dBμV) − 107 dB; this fixed offset is invalid at other impedances.

PRE-COMPLIANCE SUPPORT

Need accredited testing or pre-compliance support?

These tools support design-stage estimates. For accredited EMC testing, compliance decisions, and troubleshooting, contact us.

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