Calculate simple interest, total interest earned and total payable amount based on the principal amount, annual interest rate and investment or loan duration.
Enter the principal amount, annual interest rate and investment or loan duration.
The calculator applies the simple interest formula to determine the total interest earned during the selected period.
Instantly see the interest earned, total payable amount and complete investment or loan summary.
Simple interest is the interest calculated only on the original principal amount throughout the investment or loan period. Unlike compound interest, previously earned interest is not added back to the principal, making the calculation straightforward and easy to understand.
Simple interest uses a fixed percentage of the original principal, making it one of the easiest financial calculations.
Since interest is calculated only on the principal amount, the returns remain consistent throughout the investment period.
Simple Interest = (Principal × Rate × Time) ÷ 100
Where Principal is the original amount invested or borrowed, Rate is the annual interest rate and Time is the investment or loan duration.
Total Amount Formula
Total Amount = Principal + Simple Interest
| Feature | Simple Interest | Compound Interest |
|---|---|---|
| Interest Calculation | Principal Only | Principal + Previous Interest |
| Growth | Linear | Exponential |
| Returns | Lower | Higher Over Time |
| Common Uses | Personal Loans, Auto Loans | Investments, SIPs, Savings |
Suppose you invest ₹100,000 at an annual interest rate of 8% for 5 years.
The Simple Interest Calculator helps you quickly determine the interest earned on an investment or the interest payable on a loan using the standard simple interest formula. Simply enter the principal amount, annual interest rate and time period to calculate the total interest and final amount.
Simple interest is widely used for personal loans, vehicle loans, short-term financing and educational purposes because the interest is calculated only on the original principal amount throughout the loan or investment period.
This Simple Interest Calculator provides estimated values based on the information you enter. Actual loan or investment calculations may vary depending on lender policies, fees, taxes and repayment terms. The calculator is intended for educational and planning purposes only.
Simple interest is interest calculated only on the original principal amount throughout the investment or loan period.
Simple Interest = (Principal × Rate × Time) ÷ 100.
Simple interest is calculated only on the principal amount, while compound interest is calculated on both the principal and accumulated interest.
Yes. It can be used for many simple interest loans, educational examples and basic financial calculations.
Yes. You can calculate simple interest using years, months or days.
Neither is universally better. Simple interest is easier to understand and commonly used for certain loans, while compound interest is typically used for long-term investments.
It uses the standard simple interest formula and provides reliable estimates based on the values you enter.
Yes. It is completely free and works on desktop, tablet and mobile devices.
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