Compound Interest Calculator
See how your money grows with the power of compound interest.
Future Value
$0
$0
Total Deposits
$0
Interest Earned
Simple interest would be: $0
The Compound Interest Formula
A = P(1 + r/n)^(nt)
Where:
- A = Final amount
- P = Principal (initial investment)
- r = Annual interest rate (decimal)
- n = Compounding frequency per year
- t = Time in years
The Rule of 72
A quick way to estimate how long it takes to double your money:
Years to double ≈ 72 ÷ Interest Rate
| Interest Rate | Years to Double |
|---|---|
| 4% | 18 years |
| 6% | 12 years |
| 8% | 9 years |
| 10% | 7.2 years |
| 12% | 6 years |
Power of Starting Early
If you invest $200/month at 7% annual return:
| Starting Age | At Age 65 | Total Invested |
|---|---|---|
| 25 (40 years) | $528,025 | $96,000 |
| 35 (30 years) | $243,994 | $72,000 |
| 45 (20 years) | $104,185 | $48,000 |
| 55 (10 years) | $34,616 | $24,000 |
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