Calculate simple interest, total amount, and see a detailed breakdown of your investment or loan.
Principal Amount
₹0.00
Total Interest
₹0.00
Total Amount
₹0.00
This simple interest calculator works out interest with SI = P × R × T: enter the principal, the annual rate and the time in years, months and days, and it shows the interest, the total amount and the interest per year, month and day. For example, ₹1,00,000 at 8.5% for 2 years gives ₹17,000 interest and ₹1,17,000 in total.
Simple interest is one of the most fundamental concepts in finance, forming the basis for many types of loans, investments, and savings accounts. Unlike compound interest, it is calculated only on the original principal amount. A simple interest calculator is an essential tool for students learning finance, individuals planning investments, and anyone taking out a simple loan. This comprehensive guide will explain the simple interest formula, its applications, how it differs from compound interest, and how to use our powerful online interest tool for quick and accurate calculations.
Our tool is designed to be flexible and provide a detailed breakdown of your calculation.
The beauty of simple interest lies in its straightforward formula. A SI calculator uses this formula to determine the interest earned.
Simple Interest (SI) = P × R × T
Where:
The total amount at the end of the period is:
Total Amount = Principal + Simple Interest
Our calculator makes it easy to handle time periods that aren't in whole years. It converts the months and days into a fraction of a year before applying the formula:
T = Years + (Months / 12) + (Days / 365)
It uses a 365-day year and treats every month as 1/12 of a year. Banks may count actual days or use a 360-day year, so their figure can differ slightly.
This is the most critical concept to understand in personal finance.
Simple interest is easier to calculate but generally yields lower returns for investments compared to compound interest.
While most modern financial products use compound interest, a simple interest calculator is still highly relevant in many scenarios:
To do this manually, you must convert the months into years by dividing by 12. For example, 6 months is `6 / 12 = 0.5` years. Our calculator does this automatically when you enter a value in the "Months" field.
Yes, this calculator is free to use, with no sign-up, and the calculation runs in your browser.
No, this tool is specifically a simple interest calculator. Compound interest calculations require a different formula and are typically found in a separate, dedicated "Compound Interest Calculator."
Understanding simple interest is the first step toward financial literacy. Our Simple Interest Calculator applies SI = P × R × T to any period in years, months and days, and breaks the interest down per year, month and day with a chart of principal versus interest.