I can't think of an example of a real-life measurement with 28 decimal digits of precision, and if there is, I bet they have a custom converter.
Please don't be the calculator that ignores significant digits and encourages people to write nonsense things like "an adult blue whale can be up to 29.9 meters (1177.16535 inches) long".
> Think about that. We have a circle more than 94 billion miles (more than 150 billion kilometers) around, and our calculation of that distance would be off by no more than the width of your little finger.
Anyone who needs more precision than that is almost certainly sitting next to a computer with bespoke software running on it.
Please don't be the calculator that ignores significant digits and encourages people to write nonsense things like "an adult blue whale can be up to 29.9 meters (1177.16535 inches) long".