Financial Planning . Investment News . Personal Finance
How Compound Interest Doubling Works: A Rule-of-72 Walkthrough for Real Savings Accounts
Last updated: May 04, 2026 By Chiyo Morimoto Divide 72 by your annual rate of return and the result is roughly the number of years it takes a lump sum to double. At a 4.50% APY high-yield savings account, that’s about 16 years. The catch is that nearly every explainer stops there. A real saver […]







