How many letters can be generated from an n-word diceware phrase

howMany.js

function howMany(n) {
  var L = Math.pow(7776, n);
  var num = Math.log(L);
  var den = Math.log(26);
  var total = num / den;
  //console.log("result", L, num, den, total);
  console.log("A diceware phrase of", n, "words will give", total, "letters")
}