What this solver is actually solving
This calculator assumes one value grows into another through repeated compounding with no interim contributions or withdrawals. That makes it a narrow but useful solver for implied growth rates on deposits, balances, or generic value paths where only the start point, end point, and number of compounding periods are known.
The result is shown three ways: the periodic rate, the nominal annual rate, and the effective annual rate. Those numbers answer different questions, so keeping all three visible helps prevent confusion.