$100 Invested at 4% for 3 Years
$112.73
Future Value (compounded monthly)
$100 invested at 4% annual compound interest (compounded monthly) for 3 years will grow to $112.73. You earn $12.73 in interest. At 4%, your money doubles in approximately 18 years (Rule of 72).
Year-by-Year Growth
| Year | Balance | Interest |
|---|---|---|
| 1 | $104.07 | $4.07 |
| 2 | $108.31 | $8.31 |
| 3 | $112.73 | $12.73 |
Quick Reference Table
| Principal | Rate | Years | Future Value |
|---|---|---|---|
| $100 | 2% | 3 yrs | $106.18 |
| $100 | 3% | 3 yrs | $109.41 |
| $100 | 5% | 3 yrs | $116.15 |
| $100 | 6% | 3 yrs | $119.67 |
| $100 | 4% | 1 yrs | $104.07 |
| $100 | 4% | 2 yrs | $108.31 |
| $100 | 4% | 5 yrs | $122.10 |
| $100 | 4% | 7 yrs | $132.25 |
| $100 | 4% | 10 yrs | $149.08 |
| $100 | 4% | 15 yrs | $182.03 |
Formula Used
A = P(1 + r/n)nt
- P = $100
- r = 4% = 0.04
- n = 12 (monthly)
- t = 3 years
- A = $112.73
Frequently Asked Questions
How much will $100 grow at 4% compound interest in 3 years?
$100 grows to $112.73. Interest earned: $12.73.
How long to double $100 at 4%?
Using the Rule of 72: 72 ÷ 4 ≈ 18 years.
What is the compound interest formula?
A = P(1 + r/n)^(nt). P=$100, r=4%=0.04, n=12, t=3.