Savings Interest Rate Calculator
Calculate the effective interest rate on your savings considering initial deposit, monthly contributions, and final balance over a given period.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator determines the effective annual interest rate needed for your savings to grow from an initial deposit and regular monthly contributions to a target final balance over a given time period.
How to Use:- Initial Deposit ($): Enter the starting amount in your savings account (e.g., 1000).
- Monthly Contribution ($): Enter the fixed amount you add each month (e.g., 100).
- Final Balance ($): Enter the total amount you want to have at the end (e.g., 15000).
- Time Period (Years): Enter the number of years you plan to save (e.g., 5).
- Click Calculate Interest Rate.
The result shows the effective annual interest rate required to reach your goal. All monetary values are in US dollars ($). Ensure all inputs are positive numbers; the final balance must be greater than the initial deposit.
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Frequently Asked Questions
It calculates the effective annual interest rate earned on your savings given the initial deposit, monthly contributions, final balance, and time period.
The calculator uses the future value of an annuity formula and solves for the monthly interest rate using the Newton-Raphson method, then annualizes it.
The calculator requires the final balance to be greater than the initial deposit to compute a positive interest rate.
