Compound Interest Calculator
See how your money grows over time with the power of compound interest.
Investment Details
$
Initial investment amount
$
Amount you'll add each month
%
S&P 500 averages ~10% historically
Future Value
$300,851
After 20 years
Total Contributed
$130,000
Interest Earned
$170,851
Total Growth
131%
Return on contributions
Growth Breakdown
Contributions
Interest
Contributions: 43%Interest: 57%
Year by Year Breakdown
| Year | Balance | Contributions | Interest Earned |
|---|---|---|---|
| 1 | $16,919 | $16,000 | $919 |
| 3 | $32,294 | $28,000 | $4,294 |
| 5 | $49,973 | $40,000 | $9,973 |
| 7 | $70,299 | $52,000 | $18,299 |
| 9 | $93,671 | $64,000 | $29,671 |
| 11 | $120,544 | $76,000 | $44,544 |
| 13 | $151,443 | $88,000 | $63,443 |
| 15 | $186,971 | $100,000 | $86,971 |
| 17 | $227,820 | $112,000 | $115,820 |
| 19 | $274,790 | $124,000 | $150,790 |
| 20 | $300,851 | $130,000 | $170,851 |
The Power of Compound Interest
Compound interest is often called "the eighth wonder of the world" because of its ability to grow wealth exponentially over time. Unlike simple interest, compound interest earns interest on your interest.
Key Factors
- • Time: The longer you invest, the more compound interest works for you
- • Rate: Higher returns compound faster
- • Frequency: More frequent compounding = slightly higher returns
- • Contributions: Regular additions accelerate growth
Rule of 72
To estimate how long it takes to double your money, divide 72 by your annual return rate.
At 7% return: 10.3 years to double
Track Your Investment Growth
Connect your investment accounts and watch your compound interest grow in real-time with Adphex.