Compounding & Growth

Compounding is the core mechanic behind almost every long-term finance outcome — investment growth, loan balances, fee erosion, dividend reinvestment. The same formula governs all of them: a quantity that grows proportionally to its current size, period after period, until small differences in rate or time become enormous differences in outcome.

The calculators in this category show that math in full. Every tool displays the formula it uses, labels every assumption baked into the projection, and produces a period-by-period schedule so you can see exactly how the number was reached — not just what the final answer is. The engine is verified against the SEC's investor.gov reference calculator.

Start with the Compound Interest Calculator to understand the core mechanics. The other tools in this cluster (DRIP, fee drag, crypto compounding) build on the same engine for more specific scenarios.