Physics

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Frequency Bandwidth Calculator.

Calculate bandwidth and center frequency from explicit lower and upper frequency edges.

On-device calculationNo signup
01

Set your values

Results update as you type.

Bandwidth: 900 Hz

Bandwidth

900.000000Hz
Center frequency: 550 Hz

Center frequency

550.000000Hz

Results update automatically as you type.

Educational idealized model with every parameter shown; this tool does not size wiring, components, or safety systems.

Use Cases

Determine signal bandwidth

Quickly find the bandwidth of a signal or channel by entering its lower and upper frequency limits.

Example: Lower: 100 Hz, Upper: 500 Hz → Bandwidth: 400 Hz

Find center frequency for tuning

Calculate the center frequency of a band, useful for setting filters or oscillators.

Example: Lower: 2 MHz, Upper: 6 MHz → Center: 4 MHz

Frequently Asked Questions

What does this calculator compute?
It computes the bandwidth (difference between upper and lower frequencies) and the center frequency (average of the two edges) based on the values you enter.
What units are used?
The calculator uses hertz (Hz) for both the lower and upper frequency inputs. The results are also in hertz.
Can I use this for any frequency range?
Yes, as long as you provide the lower and upper frequencies in hertz. The calculator works for any positive values where the upper frequency is greater than the lower.

Tips & Common Mistakes

Tips

  • Ensure the upper frequency is greater than the lower frequency to get a positive bandwidth.
  • Use consistent units (Hz) for both inputs; convert kHz or MHz to Hz if needed.
  • The center frequency is the arithmetic mean, not the geometric mean, so it's simply (lower + upper) / 2.
  • For narrowband signals, the center frequency is close to the midpoint; for wideband, it's still the midpoint.

Common Mistakes to Avoid

  • Entering the upper frequency as smaller than the lower, resulting in a negative bandwidth.
  • Mixing units, such as entering one value in kHz and the other in Hz, without converting.
  • Assuming the center frequency is the geometric mean, which is only true for certain logarithmic scales.

Last updated: August 13, 2026