🎵 Music Calculators

BPM to delay times, tap tempo, note frequencies, capo and transposing, song length, speaker impedance and streaming payouts.

Audio File SizeCalculate the size of a WAV or AIFF file from sample rate, bit depth, channels and length, or of an MP3 or AAC file from its bitrate. Results in MB, GB and MiB.BPM to Delay (ms)Convert BPM to delay and reverb times in milliseconds and hertz for whole to 32nd notes, straight, dotted and triplet. Or turn a delay time back into BPM.Transpose & CapoTranspose a chord progression up or down any number of semitones, with sharps or flats, slash chords and extensions. Or find the capo fret that lets you play a song with easy open shapes.Note ↔ Frequency (Hz)Convert a note name and octave to its frequency in Hz and MIDI number, or find the nearest note and cents for any frequency. Set A4 to 440, 432, 442 or any pitch.Song Length (Bars ↔ Time)Work out how long a song or section lasts from its tempo, time signature and number of bars, or how many bars you need to fill a target length like 3:30.Speaker Impedance (Ohms)Find the total impedance of speakers wired in series, parallel or series-parallel, or of mixed speakers in parallel. Check it against your amp's minimum load and see how power splits.Streaming RoyaltiesEstimate what your streams pay on Spotify, Apple Music, YouTube Music, Amazon Music and Tidal using typical per-stream averages, after your distributor's cut and band or label splits.Tap Tempo (BPM)Tap along to a song to find its BPM, with half-time and double-time readings. Or count beats over a few seconds and convert them to beats per minute.