Finance CalculatorsPrivate by design
Simple Interest Calculator
Enter a principal, interest rate, and time period to calculate simple interest.
How to use this tool
- 1Enter the principal amount.
- 2Enter the annual interest rate and years.
- 3See the interest earned and total.
Frequently asked questions
How is simple interest different from compound interest?+
Simple interest is calculated only on the original principal; compound interest is calculated on principal plus previously earned interest, so it grows faster over time.
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