Note Frequency Calculator
Pick any note and octave, choose a tuning standard, and instantly see frequency in Hz, period in ms, wavelength in air, neighboring semitones, and all octaves.
Note Settings
Select a note and click Calculate
A4
440.000
Hz
Period
2.273 ms
Wavelength in Air
0.780 m
MIDI Note
69
Tuning Reference
A4 = 440 Hz
Adjacent Semitones (±5)
| Step | Note | Frequency (Hz) |
|---|
Same Note Across Octaves (0 – 8)
| Note | Frequency (Hz) |
|---|
Done!
Summary
Pick any note and octave, choose a tuning standard, and instantly see frequency in Hz, period in ms, wavelength in air, neighboring semitones, and all octaves.
How it works
- Select a note name from the dropdown (C through B).
- Choose the octave number (0 through 8).
- Select a tuning standard — A4 = 440 Hz is the modern concert standard.
- Click Calculate to see the frequency, period, wavelength, neighboring semitones, and all octaves.
- Click Play Tone to hear a 1-second sine wave at the calculated frequency.
- Click Reset to return to the default A4 = 440 Hz setting.
Use cases
- Tune instruments by verifying the Hz of specific notes against a reference.
- Compare concert pitch (440 Hz) vs baroque pitch (415 Hz) or Verdi tuning (432 Hz).
- Build synthesizer patches by finding exact frequencies for target notes.
- Audio engineers checking octave relationships and harmonic series.
- Music teachers explaining pitch relationships and equal temperament math.
Frequently Asked Questions
Last updated: 2026-07-01 ·
Reviewed by Nham Vu