Simple Interest Calculator
Calculate the direct interest earned or paid on a principal sum over a given time duration and flat rate.
Simple Interest Summary
Basic flat interest calculation results:
Principal Sum
The initial capital sum borrowed or lent.
Flat Interest
The calculated simple interest over the chosen duration.
Total Value
The sum of the principal and interest components.
How is it calculated?
SI = \frac{P \times R \times T}{100}Where SI is Simple Interest, P is Principal Amount, R is annual rate of interest, and T is time in years.
Worked Examples
₹2 Lakh Loan for 4 Years at 8%
The simple interest is calculated as (200,000 * 8 * 4) / 100, which equals ₹64,000. Total amount to return is ₹2,64,000.
₹50,000 Deposit for 2 Years at 5%
Simple interest earned is ₹5,000. The final balance matures to ₹55,000.
Simple Interest Essentials and Math Guide
What is Simple Interest?
Simple Interest is a quick and straightforward method of calculating the interest charge on a loan or investment. Unlike compound interest, simple interest is calculated solely on the original principal amount. The interest earned or paid remains constant throughout each period.
Simple interest is commonly used for short-term personal loans, car loans, retail installment plans, and basic certificates of deposit.
The Mathematical Formula for Simple Interest
The mathematical formula for calculating simple interest is:
SI = (P * R * T) / 100
Where P is the Principal sum of money, R is the annual interest rate in percent, and T is the time duration in years.
For example, if you borrow ₹2,00,000 at 8% simple interest for 3 years, the interest is (200,000 * 8 * 3)/100 = ₹48,000. The total repayment amount is Principal + Interest = ₹2,48,000.
Frequently Asked Questions
How does simple interest differ from compound interest?
Where is simple interest used in banking?
Results are estimates and should not be considered financial advice.