$100 Invested at 9% for 1 Years
$109.38
Future Value (compounded monthly)
$100 invested at 9% annual compound interest (compounded monthly) for 1 years will grow to $109.38. You earn $9.38 in interest. At 9%, your money doubles in approximately 8 years (Rule of 72).
Year-by-Year Growth
| Year | Balance | Interest |
|---|---|---|
| 1 | $109.38 | $9.38 |
Quick Reference Table
| Principal | Rate | Years | Future Value |
|---|---|---|---|
| $100 | 7% | 1 yrs | $107.23 |
| $100 | 8% | 1 yrs | $108.30 |
| $100 | 10% | 1 yrs | $110.47 |
| $100 | 11% | 1 yrs | $111.57 |
| $100 | 9% | 2 yrs | $119.64 |
| $100 | 9% | 3 yrs | $130.86 |
| $100 | 9% | 5 yrs | $156.57 |
| $100 | 9% | 7 yrs | $187.32 |
| $100 | 9% | 10 yrs | $245.14 |
| $100 | 9% | 15 yrs | $383.80 |
Formula Used
A = P(1 + r/n)nt
- P = $100
- r = 9% = 0.09
- n = 12 (monthly)
- t = 1 years
- A = $109.38
Frequently Asked Questions
How much will $100 grow at 9% compound interest in 1 years?
$100 grows to $109.38. Interest earned: $9.38.
How long to double $100 at 9%?
Using the Rule of 72: 72 ÷ 9 ≈ 8 years.
What is the compound interest formula?
A = P(1 + r/n)^(nt). P=$100, r=9%=0.09, n=12, t=1.