Finance tool
Simple Interest Calculator
Find simple interest from principal, annual interest rate, and time in years.
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How To Use Simple Interest Calculator
Quick notes to help you understand the result before you act on it.
Overview
Use this simple interest calculator for loans, deposits, or classroom math where interest does not compound.
Enter principal, annual rate, and time to calculate interest and total amount.
Simple Interest Formula
- Simple Interest = principal x rate x time / 100.
- Total amount = principal + simple interest.
Practical Tips
- Use annual rate when time is in years.
- Use compound interest tools when interest is added back to principal.
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FAQ
Common questions about this tool.
What is simple interest?
Simple interest is calculated only on the original principal amount.
Is this calculator free?
Yes. It runs in the browser and does not require login.