Creator topic
Music & Audio Production calculators
Convert tempo, note, and frequency relationships so you can move between tools and formats without guesswork.
Reviewed by BoringToolsKit · August 24, 2026 · Planning information, not professional advice.
Music & Audio Production: the big picture
Music is built from math: tempo, note durations, time signatures, and frequency ratios all relate in ways you can calculate. Understanding the relationships — how a tempo maps to a duration, how a scale is constructed, how frequencies relate to pitch — turns a lot of guesswork into an exact answer. BoringToolsKit's music and audio tools compute tempo-to-duration conversions, frequency relationships, and scale note formulas.
- Beats per minute maps to a note duration in milliseconds.
- A 2:1 frequency ratio is an octave.
- Major/minor scales are built from fixed interval patterns.
- Convert a tempo (BPM) to a millisecond duration for a delay or note.
- Compute a frequency ratio or known-pitch missing value.
- Build a scale or chord from its interval formula.
Worked example: delays at 120 BPM
- Step 1: BPM to MS Calculator — Enter 120 BPM See: Quarter note = 500 ms; dotted eighth = 375 ms — the classic delay times
- Step 2: Key Transposition Calculator — Transpose from C up 2 semitones See: The song lands in D — all chords shift the same distance
- Step 3: Frequency to Note Converter — Enter 440 Hz See: A4 — the tuning reference for the session
Numbers depend on the inputs you enter; the walkthrough shows one realistic scenario.