uptempo

BPM math, dependency-free. From ambient to uptempo and beyond.

import uptempo, { msToBpm, tapTempo } from "uptempo";

const t = uptempo(174);        // drum & bass
t.quarter;                     // 344.8ms
t.sixteenth;                   // 86.2ms
t.triplet(t.eighth);           // swing material
t.bar();                       // one 4/4 bar in ms

msToBpm(500);                  // 120

const tap = tapTempo();
button.on("press", () => console.log(tap.tap())); // live BPM from taps

Handy for LED sync, animation timing, sequencers, or arguing about whether uptempo starts at 190 or 200 BPM (this library takes no position).

MIT © wobondar