Frequency to Musical Note Converter
Convert any frequency in Hz to its corresponding musical note and octave — and back again. Free online pitch frequency converter for musicians, audio engineers, and music theory students.
Understanding Musical Frequency
Musical notes correspond to specific frequencies measured in Hertz. Higher frequencies produce higher pitches. Lower frequencies produce lower pitches. The standard tuning reference is A4 at 440 Hz.
Each octave doubles the frequency. A4 at 440 Hz becomes A5 at 880 Hz. A3 sits at 220 Hz. This doubling pattern applies to all notes across the musical spectrum.
Note Frequency Chart (Equal Temperament)
| Note | Octave 3 | Octave 4 | Octave 5 | Octave 6 |
|---|---|---|---|---|
| C | 130.81 Hz | 261.63 Hz | 523.25 Hz | 1046.50 Hz |
| C#/Db | 138.59 Hz | 277.18 Hz | 554.37 Hz | 1108.73 Hz |
| D | 146.83 Hz | 293.66 Hz | 587.33 Hz | 1174.66 Hz |
| D#/Eb | 155.56 Hz | 311.13 Hz | 622.25 Hz | 1244.51 Hz |
| E | 164.81 Hz | 329.63 Hz | 659.25 Hz | 1318.51 Hz |
| F | 174.61 Hz | 349.23 Hz | 698.46 Hz | 1396.91 Hz |
| F#/Gb | 185.00 Hz | 369.99 Hz | 739.99 Hz | 1479.98 Hz |
| G | 196.00 Hz | 392.00 Hz | 783.99 Hz | 1567.98 Hz |
| G#/Ab | 207.65 Hz | 415.30 Hz | 830.61 Hz | 1661.22 Hz |
| A | 220.00 Hz | 440.00 Hz | 880.00 Hz | 1760.00 Hz |
| A#/Bb | 233.08 Hz | 466.16 Hz | 932.33 Hz | 1864.66 Hz |
| B | 246.94 Hz | 493.88 Hz | 987.77 Hz | 1975.53 Hz |
Frequency to Note Conversion Formula
Calculate musical note from frequency using equal temperament tuning.
Where n = MIDI note number, A4 = MIDI note 69, frequency in Hz
Example: Finding the note for 523.25 Hz
Standard Tuning References
| Standard | A4 Frequency | Common Use |
|---|---|---|
| Concert Pitch | 440 Hz | International standard since 1955 |
| Baroque Pitch | 415 Hz | Historical performance practice |
| Classical Pitch | 430 Hz | 18th-19th century orchestras |
| Orchestral Pitch | 442 Hz | Modern European orchestras |
| High Pitch | 444 Hz | Some modern orchestras |
| Scientific Pitch | 432 Hz | Alternative tuning movement |
Guitar Standard Tuning Frequencies
- 6th string (E2): 82.41 Hz
- 5th string (A2): 110.00 Hz
- 4th string (D3): 146.83 Hz
- 3rd string (G3): 196.00 Hz
- 2nd string (B3): 246.94 Hz
- 1st string (E4): 329.63 Hz
Frequently Asked Questions
What is the frequency of middle C?
Middle C (C4) vibrates at 261.63 Hz in equal temperament tuning with A4 = 440 Hz. This note sits on the first ledger line below the treble clef staff.
Why is A4 set to 440 Hz?
The International Organization for Standardization adopted 440 Hz as the concert pitch standard in 1955. This unified tuning across orchestras and instrument manufacturers worldwide.
What is the highest note humans can hear?
Young adults can hear up to 20,000 Hz (20 kHz). The highest piano note (C8) reaches 4186 Hz. Hearing range decreases with age, especially for high frequencies.
How do I tune my instrument using frequency?
Use a tuner app or device that displays frequency. Play each string or note and adjust until the displayed frequency matches the target. Fine-tune by listening for beats to disappear.
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