$500 Invested at 8% for 3 Years
$635.12
Future Value (compounded monthly)
$500 invested at 8% annual compound interest (compounded monthly) for 3 years will grow to $635.12. You earn $135.12 in interest. At 8%, your money doubles in approximately 9 years (Rule of 72).
Year-by-Year Growth
| Year | Balance | Interest |
|---|---|---|
| 1 | $541.50 | $41.50 |
| 2 | $586.44 | $86.44 |
| 3 | $635.12 | $135.12 |
Quick Reference Table
| Principal | Rate | Years | Future Value |
|---|---|---|---|
| $500 | 6% | 3 yrs | $598.34 |
| $500 | 7% | 3 yrs | $616.46 |
| $500 | 9% | 3 yrs | $654.32 |
| $500 | 10% | 3 yrs | $674.09 |
| $500 | 8% | 1 yrs | $541.50 |
| $500 | 8% | 2 yrs | $586.44 |
| $500 | 8% | 5 yrs | $744.92 |
| $500 | 8% | 7 yrs | $873.71 |
| $500 | 8% | 10 yrs | $1,109.82 |
| $500 | 8% | 15 yrs | $1,653.46 |
Formula Used
A = P(1 + r/n)nt
- P = $500
- r = 8% = 0.08
- n = 12 (monthly)
- t = 3 years
- A = $635.12
Frequently Asked Questions
How much will $500 grow at 8% compound interest in 3 years?
$500 grows to $635.12. Interest earned: $135.12.
How long to double $500 at 8%?
Using the Rule of 72: 72 ÷ 8 ≈ 9 years.
What is the compound interest formula?
A = P(1 + r/n)^(nt). P=$500, r=8%=0.08, n=12, t=3.