Interest Rate Calculator
Find the annual interest rate that turns a present value into a target future value over a given time.
Runs 100% in your browser — nothing is uploaded.
Result
Formula
r = (FV ÷ PV)^(1/t) − 1
About this calculator
The Interest Rate Calculator determines the effective annual interest rate on a loan or investment when the payment amount, principal, and term are known. It is useful for comparing loan offers, understanding the true cost of financing, or evaluating investment returns.
How to use
- 1
Enter the present value (PV) you start with.
- 2
Enter the future value (FV) you want to reach.
- 3
Enter the number of years (t), then read the required annual rate and total growth.
Frequently asked questions
What is the difference between nominal and effective interest rate?
The nominal rate is the stated annual rate without compounding. The effective rate (APR) includes the effect of compounding and any fees, giving the true annual cost.
Can this calculator be used for investments?
Yes, if you know the initial investment, periodic withdrawals or deposits, and the term, you can find the annual return rate.
Why is the calculated rate different from the advertised rate?
Advertised rates may be nominal or may exclude fees. This calculator provides the effective rate based on the payment and principal, which may include the impact of fees if they are factored into the payment.
Please note: Results are estimates for general information only and are not professional or medical/financial advice.