Calculator
Compound Interest Calculator
Calculate how your investments grow with compound interest. See final balance, total interest earned, and year-by-year growth.
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Compound Interest Calculator
See the power of compound interest. Calculate how your initial investment grows over time with regular contributions and compounding returns.
đĩInvestment Details
Optional: additional amount added each month
đ¯Investment Results
Final Balance
$54,714
Total Interest Earned
$20,714
Total Contributions
$34,000
Contributions (62.1%)Interest (37.9%)
Formula used: A = P(1 + r/n)nt + PMT Ã [((1 + r/n)nt â 1) / (r/n)]
where P = principal, r = annual rate, n = compounds/year, t = years, PMT = periodic contribution
where P = principal, r = annual rate, n = compounds/year, t = years, PMT = periodic contribution
đYear-by-Year Breakdown (First 10 Years)
| Year | Balance | Total Contributions | Total Interest |
|---|---|---|---|
| Year 1 | $13,201.42 | $12,400.00 | $801.42 |
| Year 2 | $16,634.27 | $14,800.00 | $1,834.27 |
| Year 3 | $20,315.28 | $17,200.00 | $3,115.28 |
| Year 4 | $24,262.39 | $19,600.00 | $4,662.39 |
| Year 5 | $28,494.83 | $22,000.00 | $6,494.83 |
| Year 6 | $33,033.24 | $24,400.00 | $8,633.24 |
| Year 7 | $37,899.74 | $26,800.00 | $11,099.74 |
| Year 8 | $43,118.03 | $29,200.00 | $13,918.03 |
| Year 9 | $48,713.55 | $31,600.00 | $17,113.55 |
| Year 10 | $54,713.58 | $34,000.00 | $20,713.58 |
âšī¸How Compound Interest Works
What is Compound Interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, compounding causes your money to grow exponentially â often called "the eighth wonder of the world."
How to Use This Calculator
- Enter your initial investment (principal)
- Set the annual interest rate (stock market avg ~7-10%)
- Choose how often interest compounds (more frequent = more growth)
- Enter the time period in years
- Optionally add a monthly contribution to supercharge growth
Typical Return Rates
S&P 500 (historical avg)
~10% per year
Bonds / Conservative
3â5% per year
High-Yield Savings
4â5% per year
Balanced Portfolio
6â8% per year
Disclaimer: Past performance does not guarantee future results. This calculator is for educational purposes only. Consult a financial advisor before making investment decisions.