Compound interest as of · 273

Returns that earn returns — how time turns a rate into an exponential path, and what still breaks the fairy tale. Compound interest is the mechanism by which a balance grows when returns are left invested so later growth acts on a larger base. Compound interest sits in the foundations family of this atlas: mechanisms first, products second, hype never.

Use the calculator for scenarios, then return to the section pages when you want the vocabulary behind the curve. What is compound interest in one sentence? No. Tool-Lifes pages are educational atlases. Decisions need your goals, constraints and, when appropriate, a licensed adviser.

Do I need a high return for compounding to matter? Higher net rates help, but time and contributions often dominate — especially early. Costs and behaviour can erase a “good” rate. Treat outputs as scenario sketches. Vary contribution, rate, fees and inflation to see which lever moves your goal date.