$15,000 Invested at 8% for 10 Years
Future Value
$33,295
Total Interest
$18,295
Total Invested
$15,000
Principal: $15,000
Rate: 8%
Period: 10 years
Compounding: monthly
Year-by-Year Breakdown
| Year | Balance | Interest | Contributions |
|---|---|---|---|
| 1 | $16,245 | $1,245 | $15,000 |
| 2 | $17,593 | $2,593 | $15,000 |
| 3 | $19,054 | $4,054 | $15,000 |
| 4 | $20,635 | $5,635 | $15,000 |
| 5 | $22,348 | $7,348 | $15,000 |
| 6 | $24,203 | $9,203 | $15,000 |
| 7 | $26,211 | $11,211 | $15,000 |
| 8 | $28,387 | $13,387 | $15,000 |
| 9 | $30,743 | $15,743 | $15,000 |
| 10 | $33,295 | $18,295 | $15,000 |
A one-time investment of $15,000 at 8% compounded monthly grows to $33,295 in 10 years. That's $18,295 in interest — a 122% total return.
Key Insights
- At 8%, your money doubles roughly every 9 years (Rule of 72).
- The effective annual rate (APY) with monthly compounding is 8.30% — slightly better than the nominal 8% APR.
- Compound interest earned 1.2x more than your total contributions — compounding did most of the work.
Want to adjust these numbers? Open this scenario in the calculator to change the rate, time period, or add contributions.