Frequency to Note Reference
Find the nearest musical note for any frequency. Each page shows the closest pitch in equal temperament, how many cents it deviates, and how the frequency compares across 16 tuning systems.
Concert Pitch Standards
Harmonic Series (Octaves of A)
Equal Temperament Note Frequencies (A=440)
Solfeggio / Alternative Frequencies
Electrical Power Grid Frequencies
How Frequency Lookup Works
Each frequency is mapped to its nearest musical note using the MIDI formula:
MIDI = round(69 + 12 × log₂(freq / 440)).
This identifies the closest equal-tempered pitch. The cents deviation —
1200 × log₂(input / note_hz) — shows exactly how sharp or flat
the input frequency is relative to that pitch.
Because note frequencies vary across tuning systems, each page also shows a multi-temperament table: in Pythagorean tuning, just intonation, meantone, and historical well-temperaments, the nearest note has a slightly different Hz value, which changes how close the input frequency is to that note.
For complete note frequency data across all 153 notes and 16 temperaments, see the note frequency reference. For concert pitch standards (A=440, 432, 415, 442, 443 Hz), see concert pitch reference pages.
Tune to any frequency — Get Tunable.
Tunable's tone generator and tuner let you match any frequency by ear, from 60 Hz bass to 1760 Hz violin harmonics.