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Compound Interest Calculator
Calculate how your money grows with compound interest over time. See the power of compounding with different rates, terms, and compounding frequencies.
Initial amount to invest
Annual percentage rate
Number of years for investment
How often interest is calculated
Final Amount
$16,470.09
Total Interest Earned
$6,470.09
Growth Over Time
| Year | Balance | Interest Earned |
|---|---|---|
| 0 | $10,000.00 | $0.00 |
| 1 | $10,511.62 | $511.62 |
| 2 | $11,049.41 | $1,049.41 |
| 3 | $11,614.72 | $1,614.72 |
| 4 | $12,208.95 | $2,208.95 |
| 5 | $12,833.59 | $2,833.59 |
| 6 | $13,490.18 | $3,490.18 |
| 7 | $14,180.36 | $4,180.36 |
| 8 | $14,905.85 | $4,905.85 |
| 9 | $15,668.47 | $5,668.47 |
| 10 | $16,470.09 | $6,470.09 |
How to Use
- 1Enter your initial principal amount — the money you are starting with.
- 2Set the annual interest rate as a percentage (e.g., 7 for 7%).
- 3Choose the compounding frequency: annually, semi-annually, quarterly, monthly, or daily.
- 4Enter the number of years you plan to invest or save.
- 5View your future value, total interest earned, and a year-by-year growth breakdown.
About This Tool
The Compound Interest Calculator shows how your money grows when interest earns interest over time. Unlike simple interest, which only applies to your original principal, compound interest applies to both the principal and all accumulated interest from previous periods.
This matters because compound growth is exponential, not linear. A $10,000 investment at 7% compounded annually becomes $19,672 after 10 years — nearly double — and $76,123 after 30 years. The same investment with simple interest would only reach $31,000 after 30 years.
Investors use this calculator to compare savings accounts, CDs, and investment returns across different compounding frequencies. A savings account advertising 5% APY compounded daily will yield slightly more than one compounded monthly at the same rate. The difference is small over one year but becomes significant over decades.
All calculations run in your browser using standard compound interest formulas. No financial data is stored or transmitted. The year-by-year breakdown helps you visualize the acceleration of compound growth, where most of the gains come in later years.
Tips & Best Practices
- ✓Use the Rule of 72 for quick mental math: divide 72 by the interest rate to estimate how many years it takes to double your money (e.g., 72 ÷ 8 = 9 years).
- ✓Compare compounding frequencies at the same rate — daily compounding at 5% beats annual compounding at 5%, though the difference is modest.
- ✓Start early. Due to exponential growth, money invested at age 25 grows roughly 4x more than the same amount invested at age 45, assuming the same rate.
Frequently Asked Questions
What is compound interest?▼
How often is interest compounded?▼
What is the difference between simple and compound interest?▼
How long does it take money to double with compound interest?▼
Can I use this calculator for real investments?▼
What if I want to add regular deposits?▼
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