Note Frequency Calculator
Convert notes to Hz or Hz to notes. Adjustable A4 reference pitch (432, 440, 442, or custom). Audio playback for any frequency. Full reference table from C0 through B8 with MIDI numbers.
Full Note Frequency Table
| Note | Frequency (Hz) | MIDI # | Play |
|---|
Frequently Asked Questions
What frequency is each musical note?
Every note maps to a specific frequency. Middle C (C4) is 261.63 Hz. A4 is 440 Hz in standard tuning. Going up one octave exactly doubles the frequency: A3 = 220, A4 = 440, A5 = 880. The calculator covers the full range from C0 to B8.
What is the A440 tuning standard?
The A above middle C is set to exactly 440 Hz. Adopted as the international standard in 1955. Nearly every tuner, instrument, and recording references it. Some orchestras tune a bit higher, 442 or 443 Hz, for a brighter sound in large halls.
Why do some musicians use 432 Hz or other reference pitches?
Before standardization, concert pitch ranged from about 415 to 460 Hz depending on era and location. The 432 Hz crowd says it sounds warmer. There is no scientific evidence for that, but some artists and producers prefer it for aesthetic reasons. Orchestras tend to tune at 442 or 443 for extra brightness. It comes down to preference.
How do you convert Hz to a musical note?
The formula: noteNumber = 69 + 12 × log2(frequency / 440). That produces a MIDI note number where 69 = A4. If the result is not a whole number, the decimal tells you how many cents sharp or flat of the nearest note. Or just use the Hz-to-Note tab above and skip the math.