@thi.ng/units/units/frequency.js

Extensible SI unit creation, conversions, quantities & calculations (incl. ~170 predefined units & constants)

import { s } from "./time.js";
import { defUnit, div, mul, prefix, reciprocal } from "../unit.js";
const Hz = defUnit("Hz", "hertz", reciprocal(s, true));
const kHz = defUnit("kHz", "kilohertz", prefix("k", Hz));
const MHz = defUnit("MHz", "megahertz", prefix("M", Hz));
const GHz = defUnit("GHz", "gigahertz", prefix("G", Hz));
const THz = defUnit("THz", "terahertz", prefix("T", Hz));
const rpm = defUnit("rpm", "rotation per minute", mul(Hz, 1 / 60));
const \u03C9 = defUnit("\u03C9", "radian per second", div(Hz, 2 * Math.PI));
const omega = \u03C9;
export {
  GHz,
  Hz,
  MHz,
  THz,
  kHz,
  omega,
  rpm,
  \u03C9
};