Frequency & Pitch Converter
Convert freely between Hz, note names, cents, and MIDI.
Four representations, one pitch
Any pitch can be described four ways: as a frequency in Hz, as a note name, as an integer MIDI note number, or as a cent offset from a chosen note. Calcophony lets you enter one value and immediately see the other three. Type 466.16 and it resolves to A♯4 / B♭4, MIDI 70, 0 cents from equal temperament. Type C4 and you get 261.63 Hz, MIDI 60, 0 cents. Every field accepts input directly.
What you can enter
- Frequency: in Hz, any positive number within the 1 Hz to 25,000 Hz converter range.
- Note name: C4, A♭3, F♯5.
- MIDI note: integer values from 0 to 127.
- Cents: microtonal offset from the selected MIDI note.
Options
- Reference pitch: A4 from 400 Hz through 440 Hz (ISO standard) to 480 Hz. Every conversion respects this reference.
- Pitch capture: use the microphone button to capture a measured pitch directly into the converter.
- Reference tone playback: audition the current pitch as sine, square, sawtooth, or triangle.
When to use it
Reach for this converter whenever your tools and your ear disagree on how a pitch is named. It bridges the gap between a synthesizer that expects Hz and a composer who thinks in note names, helps you diagnose an analog filter drifting by a handful of cents, and prepares parts for an ensemble tuning to 415 Hz. It also turns a measured peak from a spectrum analyzer into a pitch a player can tune to. When you need to translate between cents, frequency ratios, and constrained just-intonation approximations, use Interval & Tuning.
Related modules
Free to download, with a 7-day trial of every Pro module. iPhone, iPad, and Apple Silicon Mac.