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Use this simple interest calculator for a clear financial estimate. Results update instantly in your browser.
What this calculator does
Calculate interest that is charged only on the original principal.
How to use this calculator
- Enter principal, annual rate, and time period.
- Review the calculation assumptions before using the result.
- The result separates interest from the final balance.
How to calculate
Simple interest = principal × annual rate × term; rearrange the formula to solve for balance, principal, term, or rate.
Enter the values requested by the simple interest calculator.
Worked example
Use the default values as a worked example, then replace them with your own figures.
Understanding your result
The result separates interest from the final balance.
- Most savings and loans compound, so check the product terms.
- Double-check values and units before calculating.
This calculator is educational and is not financial or medical advice.
Frequently asked questions
What does this simple interest calculator do?
Calculate interest that is charged only on the original principal.
How do I use this simple interest calculator?
Enter principal, annual rate, and time period.
What does the result mean?
The result separates interest from the final balance.
What should I check before relying on it?
Most savings and loans compound, so check the product terms.