Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Signal (V RMS)

RMS signal level.

Noise Floor (V RMS)

Integrated noise floor.

A-Weight Correction (dB)

A-weighting correction applied to the broadband ratio.

Compute A-weighted signal-to-noise ratio snrADb = 20 * log10(signalVrms / noiseFloorVrms) + aWeightCorrectionDb, with the correction defaulting to zero. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

SNR (dB)

A-weighted signal-to-noise ratio.

• Audio calculations must distinguish peak, RMS, dBu, dBV, acoustic SPL, electrical power, nominal impedance, sensitivity, and weighting. Loudspeaker impedance varies with frequency, room response changes SPL, and clipping or thermal limits are not represented by a single nominal value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Ideal ADC SNR

  Estimate ideal full-scale sine-wave signal-to-quantization-noise ratio as 6.02N+1.76 dB. Oversampling, thermal noise, distortion, and reduced input amplitude are not included.

• MDS Calculator

  Compute the minimum detectable signal as MDS(dBm) = -174 + 10 x log10(BW(Hz)) + NF(dB) + SNR(dB); bandwidth must be positive and the noise figure non-negative.

• SINAD dB

  Compute SINAD in decibels as 20 x log10(Vfundamental / sqrt(noise^2 + distortion^2)); there must be some noise or distortion.