$100 Invested at 12% for 3 Years
$143.08
Future Value (compounded monthly)
$100 invested at 12% annual compound interest (compounded monthly) for 3 years will grow to $143.08. You earn $43.08 in interest. At 12%, your money doubles in approximately 6 years (Rule of 72).
Year-by-Year Growth
| Year | Balance | Interest |
|---|---|---|
| 1 | $112.68 | $12.68 |
| 2 | $126.97 | $26.97 |
| 3 | $143.08 | $43.08 |
Quick Reference Table
| Principal | Rate | Years | Future Value |
|---|---|---|---|
| $100 | 10% | 3 yrs | $134.82 |
| $100 | 11% | 3 yrs | $138.89 |
| $100 | 13% | 3 yrs | $147.39 |
| $100 | 14% | 3 yrs | $151.83 |
| $100 | 12% | 1 yrs | $112.68 |
| $100 | 12% | 2 yrs | $126.97 |
| $100 | 12% | 5 yrs | $181.67 |
| $100 | 12% | 7 yrs | $230.67 |
| $100 | 12% | 10 yrs | $330.04 |
| $100 | 12% | 15 yrs | $599.58 |
Formula Used
A = P(1 + r/n)nt
- P = $100
- r = 12% = 0.12
- n = 12 (monthly)
- t = 3 years
- A = $143.08
Frequently Asked Questions
How much will $100 grow at 12% compound interest in 3 years?
$100 grows to $143.08. Interest earned: $43.08.
How long to double $100 at 12%?
Using the Rule of 72: 72 ÷ 12 ≈ 6 years.
What is the compound interest formula?
A = P(1 + r/n)^(nt). P=$100, r=12%=0.12, n=12, t=3.