Music & Audio

Estimate audio file size from duration and bitrate.

Convert tempo between BPM and beat duration; show subdivisions and bar length.

Look up a key's Camelot notation and harmonic-mixing neighbours.

For any target chord, list every capo fret and easier shape that produces it.

Convert between cents, semitones and frequency ratios.

Build chord voicings from a root and chord symbol.

Name the chord(s) formed by a set of notes.

Render Roman-numeral chord progressions for any major or minor key.

Major / relative-minor keys with their sharps and flats.

Convert a DAW bar.beat.sixteenth position into elapsed seconds at any BPM.

Add or subtract incoherent dB levels and predict SPL at a new distance.

Convert BPM into tempo-synced delay times and reverb pre-delay and decay.

Generate a 16th-note grid for rock, funk, samba, trap, house or reggae grooves.

Convert any frequency to its nearest MIDI note and pitch deviation in cents.

Map every note on a guitar, bass or ukulele fretboard for any tuning.

Generate an SVG chord-chart diagram from a 6-string guitar fingering like x32010.

Find which major and minor keys contain a given set of notes.

Transpose chord names up or down by semitones (capo positions).

Calculate the gain to hit Spotify, YouTube, Apple and broadcast LUFS loudness targets.

Click-track metronome at any tempo with downbeat accent.

Diatonic modes (Ionian, Dorian, Phrygian, …) with interval patterns.

Map interval names to semitones, cents and frequency ratios.

Convert chord progressions to Nashville numbers and back for any key.

Frequency in Hz for any musical note, with adjustable concert pitch.

Find the combined grid and timing of an a:b polyrhythm at a given tempo.

Map a chord progression into Roman numerals in a given key.

Look up common audio sample rates and bit depths and where they're used.

Notes in any common scale starting on any root.

Reference SPL levels (dB) for everyday sounds.

Calculate guitar and bass string tension from gauge, scale length and pitch.

Tap a button to measure the BPM of any rhythm.

Convert bars and time signatures into seconds at any BPM.