Convert freely between MIDI note numbers, note names and frequencies. The MIDI standard assigns every note an integer from 0 to 127, where middle C is 60 and A4 is 69, and this tool translates in both directions. Enter a MIDI number to get its note name, octave and frequency, or pick a note and octave to get the number. Frequencies use the standard formula, 440 Hz times two to the power of the note minus 69 over twelve, so everything lines up with synthesizers and samplers. This is essential when you program a sequencer, map a sampler, debug a MIDI file, or set a note in code. The tool keeps values inside the valid 0 to 127 range and flags anything outside it. Whether you think in numbers or names, you can move between the two instantly.
Middle C is MIDI note 60 and A4 is MIDI note 69, tuned to 440 Hz, and every other note counts up or down from there.
It converts among MIDI note numbers, note names and frequency in Hz, so you can start from any one of the three.
Each step of one in the MIDI number is one semitone, so adding twelve raises the pitch by an octave.
Convert freely between MIDI note numbers, note names and frequencies. The MIDI standard assigns every note an integer from 0 to 127, where middle C is 60 and A4 is 69, and this tool translates in both directions.
Yes. MIDI Note Number Calculator is completely free, with no sign-up and no usage limits.
Yes. MIDI Note Number Calculator runs in any modern web browser. There is nothing to download or install.
Yes. MIDI Note Number Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.