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.

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

Fractional Bandwidth Percent (%)

The resulting fractional bandwidth percent returned as a number.

• Antenna formulas assume stated frequency, impedance match, polarization, efficiency, aperture, and propagation geometry. Nearby objects, ground, feed loss, multipath, regulatory averaging, near-field conditions, and pattern variation can make free-space or ideal-aperture results inaccurate.
• 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.

• Audio Crossover Slope

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

• Audio Equalizer Center Frequency

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