Calculate Interest Rate: Principal, Interest, Time
Determine the annual interest rate when you know the initial principal, the total interest earned, and the duration of the investment or loan.
Interest Rate Calculator
Enter the initial amount of money invested or borrowed.
Enter the total amount of interest generated over the period.
Enter the duration for which the principal was invested or borrowed.
Calculation Results
Annual Interest Rate:
—
Total Amount:
—
Interest Earned Ratio:
—
Interest per Period:
—
The annual interest rate is calculated using the formula:
Rate = (Total Interest / Principal) / (Time Period in Years)
Or expressed as a percentage:
Rate (%) = [(Total Interest / Principal) / (Time Period in Years)] * 100
Rate = (Total Interest / Principal) / (Time Period in Years)
Or expressed as a percentage:
Rate (%) = [(Total Interest / Principal) / (Time Period in Years)] * 100
Interest Growth Over Time
Calculation Details
| Variable | Value | Unit |
|---|---|---|
| Principal | — | Currency |
| Total Interest Earned | — | Currency |
| Time Period | — | — |
| Calculated Annual Rate | — | % |