Simple Interest Calculator
Calculate simple interest and see how your investment grows linearly over time with fixed annual returns.
Investment Details
Investment Returns
Enter investment details to see returns
About the simple interest calculator
Use this calculator when interest is calculated only on the original principal. It returns simple interest, total amount, and a year-by-year view.
How to use it
- Enter the principal amount, annual interest rate, and time in years.
- Select Calculate Simple Interest.
- Review the interest, total amount, and the comparison with annual compound interest.
Formula
Simple interest = P × r × t; total amount = P + simple interest
Example
A ₹10,000 principal at 5% per year for 2 years earns ₹1,000 simple interest, for a total of ₹11,000.
Important notes
This model assumes a fixed annual rate and no additions or withdrawals. Loan or deposit agreements may use different day-count conventions, compounding, fees, or taxes.