金融

Interest Rate Calculator

Calculate the required interest rate needed to reach your financial goals over time.

$
$
$
yrs
Required Annual Interest Rate
—%
Total Principal Invested
$—
Total Interest Needed
$—
使い方
  1. Enter your initial investment and your future goal amount.
  2. Enter any additional monthly contributions you plan to make.
  3. Enter the time period in years.
  4. The calculator will determine the exact annual interest rate required to reach your goal.

計算式

If PMT = 0: Rate = (FV / PV)^(1/n) − 1
If PMT > 0: Rate is solved iteratively using Future Value of Annuity formula.

Finding the required interest rate is essential for retirement planning and goal setting. If the required rate is unrealistically high (e.g., >12%), you may need to increase your monthly contributions, extend your timeline, or lower your future goal.