Music calculators
6 free tools
Little tools for the numbers behind the notes. Work out the exact frequency of a pitch, dial delay times that lock to your BPM, measure the interval between two tones, translate tempo into Italian markings, and figure out how long a track runs or how big a raw audio file will be.
Estimate uncompressed audio file size from sample rate, bit depth, channels, and length.
Turn a BPM into delay times in milliseconds for every note value, including dotted and triplet.
Convert a note name and octave into its exact frequency in hertz using equal temperament.
Measure the interval between two frequencies in semitones and cents, and name it.
Calculate a track's duration from bars, time signature, and BPM, or the bars that fit a target length.
Map a BPM to its Italian tempo marking, or a marking back to its typical BPM range.
Frequently asked questions
What tuning do these use?
The frequency and interval tools default to A4 = 440 Hz equal temperament, the modern concert-pitch standard. You can change the A4 reference on the note tool if you tune to 442 or 432.
Why sync delay to the BPM?
When an echo lands exactly on a beat subdivision it feels like part of the rhythm instead of a smear. Setting your delay to the quarter, eighth, or dotted-eighth time in milliseconds does exactly that.
Is the file-size number for MP3s?
No — it's raw uncompressed PCM, the size of a WAV or AIFF. Compressed formats like MP3 and AAC are far smaller, and lossless FLAC sits in between.