A little structure. A better practice.

Music calculator

Convert notes and frequencies, check tuning, and calculate the duration of your practice bars.

Your audio stays on your device

Note (MIDI)

Frequency to identify (Hz)

A4 reference (Hz)

Tempo (BPM)

Beats per bar

Bars

12-tone equal temperament. A4 defaults to 440 Hz; adjustable from 400 to 480 Hz. MIDI 12–119, frequency 16–20,000 Hz. Tempo assumes equal beats; swing and tempo changes are not included.

A good place to start

How to trim a practice recording →WAV, sample rate and file size →Practice with an accented metronome →From notes to frequencies →Understand tuning and cents →Calculate bars, beats and duration →