Drum & Percussion Calculators
Free, practical tools for hand drums and world percussion — convert tempo to note length, calculate drum-head tuning, generate polyrhythms, keep time with a metronome, size a djembe head, and count a tapped tempo.
BPM & Tempo Calculator
Convert a tempo into the exact millisecond length of every note value, from whole notes to sixteenth-note triplets, and see its standard tempo marking.
Drum Head Tuning Calculator
Turn a target note into a frequency, then into the membrane tension your head needs to reach it, using the circular-membrane physics formula.
Polyrhythm Generator
Lay two rhythms of any ratio — 3-against-4, 5-against-3, and beyond — onto a shared pulse grid with exact millisecond timing.
Metronome
A free browser metronome with an accented downbeat, adjustable tempo and time signature — no download required.
Djembe Head Size Calculator
Turn a shell's bearing-edge diameter into a recommended raw skin size for rope tuning, plus a player-size guide.
Beat & Tap Tempo Counter
Tap along to a groove to measure its BPM, and track exactly which bar and beat you're on in a measure of any length.