Enter any Hz frequency and instantly get the musical note name, MIDI number, and how many cents off-pitch it is.
Click any frequency to load it into the converter.
The math is based on the equal temperament tuning system where each octave doubles the frequency and there are 12 semitones per octave.
Round the MIDI number to the nearest integer to get the nearest note. The decimal remainder tells you how many cents off-pitch the input frequency is (100 cents = 1 semitone).
Common musical frequencies and their note equivalents.
| Note | Hz | MIDI |
|---|---|---|
| C2 | 65.41 | 36 |
| E2 | 82.41 | 40 |
| F2 | 87.31 | 41 |
| A2 | 110.00 | 45 |
| C3 | 130.81 | 48 |
| E3 | 164.81 | 52 |
| A3 | 220.00 | 57 |
| C4 | 261.63 | 60 |
| E4 | 329.63 | 64 |
| A4 | 440.00 | 69 |
| C5 | 523.25 | 72 |
| A5 | 880.00 | 81 |
| C6 | 1046.50 | 84 |
| E6 | 1318.51 | 88 |
Knowing what note a frequency corresponds to also tells you what register it sits in and how it behaves in a mix.
Felt more than heard. Kick rumble, sub-808 body. Use carefully.
Fundamental bass lines, low end warmth. Fills mix with weight.
Body of guitars, warmth of vocals. Can sound muddy if overcrowded.
Core vocal presence, guitar body, snare punch. Most ears are most sensitive here.
Vocal clarity, attack transients, consonants. Can cause ear fatigue.
Air, shimmer, hi-hat sizzle. Gives mix brightness and openness.
Both are tunings for concert A. The difference is how the entire scale is calibrated:
In Hz-to-note terms: at 432 Hz tuning, A4 is 432 Hz instead of 440 Hz, and all other notes shift proportionally. Our converter uses the standard 440 Hz A4 reference.
Find the BPM and key with BeatKey, then look up the exact Hz for that note, and pitch your 808 sample to match. Most 808 samples are rooted at C (around 65 Hz for C2). Use the chart to find the target Hz for any note in your key.
When you find a resonant peak in a spectrum analyzer (e.g., 250 Hz), converting it to a note name tells you if it clashes with the track key. A resonance on D at 293 Hz in a song in C major may be intentional. One on Db might be worth notching.
Drop a sample into a spectrum analyzer, find the fundamental Hz, and convert it to the root note. Now you know exactly which note the sample is centered on and can pitch it to fit your key without guessing.
US electrical hum is 60 Hz (Bb1). EU/UK hum is 50 Hz (G1). If you have hum in a recording, knowing the note name helps you understand if it is harmonically related to your song or a neutral frequency you can safely notch out.
440 Hz is A4, also called "concert A" or "concert pitch." It is the international standard tuning reference (ISO 16) used by orchestras and most modern instruments. When you tune a guitar, piano, or any instrument, A4=440 Hz is the starting reference point.
528 Hz is approximately C5. The exact pitch of C5 at standard tuning is 523.25 Hz, so 528 Hz sits about 14 cents sharp of C5. It does not correspond to a standard piano note. Some call it a "Solfeggio frequency" but this has no basis in standard music theory or acoustic science.
Middle C (C4) is 261.63 Hz, or MIDI note 60. It is the C note in the fourth octave and sits at the center of an 88-key piano. Note: FL Studio displays middle C as C5 while Ableton and Logic display it as C4. The Hz value (261.63) is the same regardless of octave numbering convention.
There is no fixed Hz value for one semitone because semitone intervals are multiplicative, not additive. Each semitone multiplies the frequency by the twelfth root of 2 (about 1.0595). So from A4 (440 Hz), one semitone up is Bb4 at 466.16 Hz (+26.16 Hz). But from A5 (880 Hz), one semitone up is Bb5 at 932.33 Hz (+52.33 Hz). The Hz gap doubles with each octave.
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