Simple Interest Calculator
Calculate the simple interest and total amount on your loans or investments quickly and easily.
Investment Details
Total Amount
Principal + Interest
Principal Amount
Total Interest
Amount Breakdown
Interest Insights
Your principal of ₹1,00,000 will earn ₹50,000 in interest over 5 years.
Interest makes up 33.3% of your final total amount.
Note: Simple interest grows linearly. If you want your interest to earn interest, consider using our Compound Interest Calculator.
Understanding Simple Interest
Simple interest is the most basic way to calculate the cost of borrowing money or the return on an investment. As the name suggests, it is "simple" because it is calculated only on the original principal amount.
The Simple Interest Formula
- SI = Simple Interest
- P = Principal (Initial Investment or Loan Amount)
- R = Annual Interest Rate (in percentage)
- T = Time period (in years)
Simple vs. Compound Interest
The key difference lies in how interest is treated over time:
Simple Interest
Interest is calculated only on the principal. The interest earned each year remains constant.
Compound Interest
Interest is calculated on the principal plus accumulated interest. Your money grows faster over time.
Frequently Asked Questions
What is Simple Interest?
Simple interest is a quick and easy method of calculating the interest charge on a loan or the return on an investment. It is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments.
How is Simple Interest calculated?
The formula for simple interest is: SI = (P × R × T) / 100. Where 'P' is the Principal amount, 'R' is the Rate of interest per annum, and 'T' is the Time period in years.
What is the difference between Simple and Compound Interest?
Simple interest is calculated only on the principal amount of a loan or deposit. Compound interest is calculated on the principal amount AND the accumulated interest of previous periods. Compound interest makes your money grow faster over time.
Where is Simple Interest commonly used?
Simple interest is often used for short-term personal loans, automobile loans, and some types of short-term investments or deposits where interest is paid out regularly rather than reinvested.