Simple Interest Calculator
Calculate simple interest and total maturity amount quickly using your principal amount, annual interest rate and investment period.
Enter Investment Details
Enter the principal, interest rate and investment period to calculate interest.
₹0.00
Enter your investment details
Year-by-Year Growth
Estimated simple interest and total amount for each year.
| Year | Opening Principal | Interest | Total Amount |
|---|---|---|---|
| Enter details and click Calculate. | |||
Calculate Simple Interest in 4 Steps
Enter three basic values and get your interest and maturity amount instantly.
Enter Principal
Enter the initial amount on which interest will be calculated.
Enter Rate
Enter the annual simple-interest rate as a percentage.
Enter Time
Select years or months and enter the investment period.
View Result
Instantly see the simple interest and total maturity amount.
Principal
Principal is the original amount invested or borrowed before interest is added.
Interest Rate
The interest rate is the annual percentage used to calculate the simple interest.
Time Period
The calculation supports both years and months for the selected investment period.
Simple Interest
Simple interest is calculated directly on the original principal amount.
SI = P × R × T / 100
P = Principal, R = Annual Interest Rate, T = Time in years.
Important Information
This calculator is provided for general educational and financial planning purposes. Actual interest may vary depending on the terms and conditions of the financial product.
The calculator assumes that the interest rate remains unchanged for the selected period and that interest is calculated only on the original principal.
Simple Interest Calculator FAQ
What is simple interest?
Simple interest is interest calculated on the original principal amount for a specified period at a specified rate.
What is the simple interest formula?
The standard formula is SI = P × R × T / 100, where P is principal, R is the annual rate and T is time in years.
Can I enter the time in months?
Yes. Select Months in the time-period selector. The calculator converts the entered months into years for the calculation.
What is the maturity amount?
Maturity amount is the original principal plus the simple interest earned during the selected period.
What is the difference between simple and compound interest?
Simple interest is calculated on the original principal, while compound interest also takes previously accumulated interest into account.
Does this calculator include taxes?
No. Taxes, fees, charges and other deductions are not included in the displayed calculation.