Simple Interest Calculator
Enter principal, annual rate, and time to compute simple interest. Useful for short-term loans, bonds, and basic savings calculations.
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Interest
Enter values to calculate
How to Use the Simple Interest Calculator
1
Enter the principal amount.
2
Enter the annual interest rate and time in years.
3
View the interest earned.
Frequently Asked Questions
What is the simple interest formula?
Interest = Principal × Rate × Time. The rate should be in decimal form (e.g. 5% = 0.05).
How is simple interest different from compound?
Simple interest is calculated only on the principal. Compound interest earns interest on accumulated interest too.
Does this include the principal in the result?
The tool shows the interest earned separately. Add it to the principal to get the total amount.