Simple Interest Calculator
Compute simple interest and total amount quickly for any principal, rate, and time period.
Simple Interest Results
What is a Simple Interest Calculator?
Simple interest is a method of calculating the interest charge on a loan or the interest earned on savings. It is computed only on the original principal amount and does not compound. This makes it straightforward to understand and predict.
Our simple interest calculator instantly computes the interest earned or owed and the total final amount. It supports time inputs in years, months, or days, automatically converting them to the correct fractional year value.
How to Use
- Enter the principal amount of the loan or deposit.
- Input the annual interest rate as a percentage.
- Enter the time duration and select whether it is in years, months, or days.
- Click Calculate to see the interest earned and total amount.
Frequently Asked Questions
What is the simple interest formula?
The formula is I = P × r × t, where P is the principal, r is the annual interest rate in decimal form, and t is the time in years.
When is simple interest used?
Simple interest is commonly used for short-term loans, auto loans, and some types of bonds. It is less common for long-term savings accounts, which usually use compound interest.
How are months and days converted to years?
Months are divided by 12 and days are divided by 365 to convert them into fractional years for the calculation.
Does simple interest benefit borrowers or lenders?
Simple interest generally benefits borrowers because the interest does not accumulate on previously earned interest, resulting in lower total interest paid compared to compounding.