Simple Interest Calculator
Find simple interest and the total repayable amount in seconds. The simple interest calculator applies the classic SI = (P × R × T) / 100 formula to your principal, annual rate, and time — perfect for short-term loans, deposits, and quick finance estimates.
$0
Simple Interest
$0
Total Amount
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How to Use the Simple Interest Calculator
- Enter the principal amount.
- Add the annual interest rate.
- Set the time period in years or months.
- Click Calculate to see the interest and total amount.
Formula Used
- P
- — principal
- R
- — annual interest rate (percent)
- T
- — time in years
Example: $5,000 at 8% for 3 years earns $1,200 interest, totaling $6,200.
Frequently asked questions
Everything you need to know about this calculator.
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