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.

Lower Hertz (Hz)

Required number input.

Upper Hertz (Hz)

Required number input.

Geometric center frequency of a band bounded by lower and upper −3 dB frequencies. 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]

Center Hertz (Hz)

The resulting center hertz returned as a number.

• 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.

• Audio Equalizer Q

  Calculate equalizer center-frequency Q from measured lower and upper half-power frequencies.

• Antenna VSWR Bandwidth

  Fractional bandwidth between measured lower and upper frequencies that both meet a chosen VSWR limit.

• Audio Crossover Slope

  Find signed filter attenuation slope in dB per octave between two measured frequencies; nonlinear transitions need more points.