Simple Interest Calculator

What is Simple Interest?

Simple interest is a method of calculating interest on a principal amount where the interest is computed only on the original principal, not on the accumulated interest. It is one of the most straightforward ways to calculate interest and is widely used in short-term loans, fixed deposits, and savings schemes.

The formula for simple interest is SI = (P × R × T) / 100, where P is the principal amount, R is the annual interest rate, and T is the time period in years. For example, if you invest ₹10,000 at an annual interest rate of 8% for 2 years, the simple interest earned would be ₹1,600, and the total amount would be ₹11,600.

Simple Interest vs Compound Interest

The key difference between simple and compound interest is that simple interest is calculated only on the principal amount, while compound interest is calculated on both the principal and the accumulated interest. Over longer periods, compound interest grows significantly faster than simple interest due to the effect of compounding.

Simple interest is commonly used in car loans, personal loans, and some fixed deposit schemes in India. It is easier to calculate and more predictable than compound interest, making it a popular choice for short-term borrowing and lending. Banks and financial institutions in India often use simple interest for loans with shorter tenures, typically up to one year.

How to Use This Calculator

Using our simple interest calculator is straightforward. Enter your principal amount (the initial sum you are investing or borrowing), the annual interest rate offered by your bank or lender, and the time period in years. The calculator instantly shows you the simple interest earned and the total amount payable or receivable. You can also use the sliders for quick adjustments and see how changing each parameter affects your returns in real time.