Use this music calculation for a precise timing, pitch, tuning, MIDI, dynamics, or audio-engineering conversion under a stated tempo and reference convention.

Semitones

Required number input.

Frequency ratio for a signed number of equal-tempered semitones in 12-TET. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Frequency Ratio

The resulting frequency ratio returned as a number.

• Results depend on tuning reference, temperament, note naming, tempo map, meter, MIDI implementation, sample rate, level reference, weighting, and artistic performance. Equal temperament and ideal timing are not universal musical requirements.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Keep the reference pitch and timing grid explicit, verify against the target instrument or DAW, and use listening tests for perceptual decisions.

• Frequency From MIDI Calculator

  Convert a MIDI note number to its equal-tempered frequency with A4 = 440 Hz.

• Frequency To Nearest Midi

  Nearest equal-tempered MIDI note number to a positive frequency, with A4=440 Hz as MIDI 69.

• Quarter Tone Microtonal Frequency

  Frequency after a signed number of 50-cent quarter-tone steps in 24-TET.