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About the Simple Interest Calculator
The Simple Interest Calculator computes interest on loans, deposits, and investments using the principal amount, interest rate, and time period. Enter your values and the tool returns the total interest earned or owed plus the final amount. Results update as you adjust each input.
The calculation follows the standard simple interest formula I = P × r × t, where P is the principal, r is the annual interest rate as a decimal, and t is the time in years. The final amount equals the principal plus the interest. Enter the rate as an annual percentage and the time in years; convert months by dividing them by twelve. For decisions involving large sums, consider consulting a financial professional.
- Enter the principal amount of the loan, deposit, or investment.
- Type the annual interest rate as a percentage.
- Set the time period in years and read the interest and total amount.