Learn what compound interest is, how it’s calculated—from annual rates to continuous compounding—and why it’s powerful for savings (and dangerous for debt).

Compound interest can help turbocharge your savings and investments, or it can quickly lead to an unruly balance, keeping you stuck in a cycle of debt. Its magic can help you earn more — or owe more.

There's a well-known saying that compound interest is the “eighth wonder of the world.” While the quote’s origins are debated, the power of compound interest is undeniable. It can transform modest ...