Calculators
Interactive tools for the numbers you work out constantly — tempo-synced delay times, note/frequency conversions, and audio latency. Everything runs in your browser; nothing is sent anywhere.
Tempo & rhythm
Work out the numbers that sit between a tempo and a plugin setting — delay times, cross-rhythms and Euclidean patterns.
BPM to Delay Time CalculatorType a tempo (or tap it) and get delay, reverb and LFO times in ms and Hz for every note division.Tap Tempo (BPM Tapper)Tap the button or spacebar in time with any track to find its BPM, averaged for a stable reading.Online MetronomeA precise, tap-tempo metronome with accented downbeats and adjustable time signature — right in your browser.Polyrhythm CalculatorSee how two cross-rhythms line up — the combined grid and millisecond timing of any x-against-y at a given tempo.Euclidean Rhythm GeneratorSpread k onsets evenly over n steps — the Bjorklund patterns behind great beats, ready for Tidal or Strudel.
Music theory
Scales, chords and keys, both directions — build one from a root, or name one from the notes you are playing.
Scale FinderPick a root and scale to get its notes, step formula, intervals and MIDI numbers — modes, minor, pentatonic, blues and more.Chord FinderChoose a root and chord type to see its notes, symbol, scale degrees and intervals — from triads to 13ths.Chord IdentifierClick the notes you're playing and it names the chord — inversions included. The reverse of the chord finder.Chord Progression GeneratorGet the actual chords for classic progressions (I–V–vi–IV, ii–V–I…) in any key, with each chord's notes.Interactive Circle of FifthsClick any key to see its notes, key signature and relative minor — the songwriter's map of key relationships.Interval CalculatorFind the interval between two notes, or transpose a note by a set number of semitones.
Audio & signal
Conversions for the technical side — pitch to frequency, decibels to gain, buffer sizes to milliseconds, and disk space.
Note / Frequency / MIDI ConverterConvert between note names, MIDI numbers and frequencies — with adjustable tuning and cents readout.Decibel ↔ Gain ConverterConvert between decibels and the linear amplitude factor you apply in code, with percent.Sample Rate & Buffer Size Latency CalculatorSee the latency each buffer size adds at your sample rate, in milliseconds and samples.Audio File Size CalculatorEstimate uncompressed audio size from sample rate, bit depth, channels and length — and the data rate.