Compound Growth: What It Is, How It Works, and What $10,000 Can Become in 20 Years
Compound growth means the gains on your money start earning gains of their own. Invest $10,000 at a 7% annual return and the first year earns $700. The second year earns 7% on $10,700 — about $749 — because last year's gain has joined the base. Repeat that for twenty or thirty years and the curve bends upward: most of the final balance comes from growth on growth, not from the dollars originally put in. This guide walks through the mechanics with concrete numbers, shows why time matters more than most beginners expect, and points out the one drag — fees — that quietly eats the effect. The Mechanics in One Short Formula Compounding follows a simple relationship: final amount = starting amount × (1 + annual return) raised to the number of years. Each year's growth is calculated on a slightly larger base, so the dollar gains get bigger even when the percentage stays the same. Watch what happens to a hypothetical $10,000 earning a steady 7% per year: After 1 year: $10,700 A...