Compound Interest Calculator Calculating Interest Rate for Compounding Calculating time required to reach goal #nav{position:fixed; top:20px; left:30px;width:86px;height: 67px; border:1px solid #aaa;display: none;background: #fafafa;padding-left: 8px;padding-right: 8px;padding-top: 12px}
 Principal amount  Future amount   Annual interest rate  Number of times per year %   Number of years: The formula for calculating time required to reach goal:   t =ln(F/p)/(ln(1+r/n)n) P =initial principal n = number of times the interest is compounded per year F = future amount after time t r = annual nominal interest rate t = number of years Example usage: If you start a bank account with \$1300 and your bank compounds the interest quarterly at an annual nominal interest rate is 4.8% . Your savings goal is \$1900. Using the formula above, with P = 1300, F = 1900, n = 4, and r = 4.8: t=ln(1900/1300)/(ln(1+0.048/4)X4).So, the investment period is 8 years. Top Use:    Compound Interest:Calculate time required - Principal:200 Future:10000 Interest Rate:8Recent user inquiry: