Investing

    Compound Interest

    1 min read·Updated regularly
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    Definition

    Interest earned on both the original principal and on the interest that has already accumulated.

    Reading time
    1 min
    Format
    Concept
    Category
    Investing
    Section
    Concepts

    Definition

    Compound interest is why time is the most powerful lever in personal finance. Each period's interest joins the principal, so the base grows exponentially rather than linearly. Small, consistent contributions started early routinely outperform large, late ones.

    Examples

    • $100/month at 6% for 10 years ≈ $16,470 (contributions: $12,000). • $100/month at 6% for 30 years ≈ $100,450 (contributions: $36,000).

    Key Takeaways

    • Time matters more than amount.
    • Consistency beats one-off deposits.
    • The same math works against you with high-interest debt.

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