How can I round an exponentially small number like this:
2.4451778232910804e-26.toFixed(4) => 2.4452e-26
exponentially small number
As you already wrote,
toFixed isn't precise enough, as it only allows "only" up to 20 decimal places. Multiply + Dividing won't work as well, as the division might give you an inaccurate longer number again. But
toPrecision(<amount-of-precision>) might help.
edit: If you want 4 decimal places, you need pass 5 as parameter (as the numbers before the point count as well).
toPrecision will give you a String, but you may easily cast it back to a number again, if needed. e.g.
var someNumber = 2.4451778232910804e-26; console.log(someNumber); console.log(someNumber.toPrecision(8));