Enter the bandwidth and center frequency into the calculator to determine the Q factor of an equalizer (EQ) band. The Q factor is a measure of how selective the EQ is in affecting a range of frequencies.

Eq Q Factor Formula

The following formula is used to calculate the Q factor of an EQ band:

Q = f_c / BW


  • Q is the Q factor of the EQ band
  • f_c is the center frequency (Hz)
  • BW is the bandwidth (Hz)

To calculate the Q factor, divide the center frequency by the bandwidth of the EQ band.

What is a Q Factor?

The Q factor, or quality factor, is a dimensionless parameter that describes how underdamped an oscillator or resonator is, and characterizes a resonator’s bandwidth relative to its center frequency. Higher Q factors indicate a narrower bandwidth, with a more selective and less damped resonator. In audio equalization, a higher Q factor means that the EQ will affect a smaller range of frequencies around the center frequency, allowing for more precise control over the sound.

How to Calculate Q Factor?

The following steps outline how to calculate the Q Factor of an EQ band.

  1. First, determine the center frequency (f_c) of the EQ band in hertz (Hz).
  2. Next, determine the bandwidth (BW) of the EQ band in hertz (Hz).
  3. Use the formula Q = f_c / BW to calculate the Q factor.
  4. Finally, enter the values into the calculator above to verify the result.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Center frequency (f_c) = 1000 Hz

Bandwidth (BW) = 200 Hz