Music Production
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A note-to-frequency converter translates musical note names into their corresponding frequencies in hertz (Hz). Every musical note has a specific frequency that determines its pitch. Understanding this relationship is crucial for synthesis, EQ, audio analysis, and tuning. The converter bridges the gap between musical thinking ("C4") and technical audio specifications ("261.63 Hz"), making it essential for both producers and audio engineers working with synthesizers, frequency analyzers, and pitch-critical work.
The conversion uses the equal temperament tuning system, standard in modern music. Each semitone represents a frequency ratio of 2^(1/12) ≈ 1.059. Starting from a reference note (usually A4 = 440 Hz), you calculate frequencies upward or downward by applying this ratio. The formula positions every note relative to this standard, ensuring all notes in your production use consistent tuning across instruments and across sessions.
Frequency = 440 Hz × 2^((n - 49) / 12), where n is the MIDI note number (A4 = 49). For example, C4 (n=36): 440 × 2^(-13/12) ≈ 261.63 Hz.
A4 = 440 Hz was internationally standardized in 1939 for consistency in orchestral and broadcast work. While some musicians prefer 432 Hz for perceived warmth, 440 Hz ensures compatibility with instrument tuning, orchestras, and industry tools. Stick with 440 unless specifically instructed otherwise.
Octaves are numbered starting from C (C0 = lowest), with middle C = C4. Each octave spans 12 semitones (C through B). Higher octave numbers = higher pitches. For example, C3 = 130.81 Hz, C4 = 261.63 Hz, C5 = 523.25 Hz (doubling each octave).
Some synthesizers accept Hz input, but most use MIDI note numbers or pitch parameters. Use the note-to-Hz converter to understand what frequency you're hearing, then input the MIDI note number into your synth. This bridges musical and technical thinking.
Frequency is objective (measurable in Hz), while pitch is perceptual. We perceive frequency logarithmically—the difference between 100 Hz and 110 Hz sounds smaller than 1000 Hz to 1100 Hz, even though both are 10 Hz differences. This is why the musical scale uses exponential frequency ratios.
