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Compound Interest Calculator

Enter your initial investment, monthly contributions, interest rate, and time frame to see exactly how compound interest builds your wealth.

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Reference Data

5$48,588$40,000$8,588
10$111,838$70,000$41,838
15$206,152$100,000$106,152
20$344,898$130,000$214,898
30$782,712$190,000$592,712

How Compound Interest Works

Compound interest is often called the 'eighth wonder of the world.' When you invest money and earn returns, those returns generate their own returns in subsequent periods. Over long time horizons, this creates exponential growth that far exceeds what simple interest would produce. The three key variables are: the amount invested, the rate of return, and time. Of these, time is the most powerful factor — which is why starting early matters more than investing large amounts later.

Frequently Asked Questions

What is compound interest?
Compound interest is interest earned on both your initial principal and previously accumulated interest. Unlike simple interest (only on principal), compounding accelerates growth exponentially over time.
How often should interest compound?
More frequent compounding (daily vs. annually) yields slightly higher returns. Most savings accounts compound daily, while many investments compound monthly or quarterly.
What is a realistic rate of return?
High-yield savings: 4-5%. Bond funds: 4-6%. Stock index funds: 7-10% historically (before inflation). Your actual returns depend on asset allocation and market conditions.

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