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A simple interest calculator figures out the amount of interest that is earned and added to an initial investment amount. To calculate the interest amount, a person must provide the interest amount, interest rate and period of investment. The calculator does the math and displays the total amount of


To calculate interest, multiply the periodic interest rate by the principle amount. For example, if you borrowed $1000 with an interest rate of 10 percent, in a year your interest paid is $100.


To find a free simple interest calculator online, visit math, business software publisher or financial sites, such as WebMath, Money Chimp and Pine Grove Software. The online calculators found on these sites may have different features, such as also calculating future values and daily interest rates


Real interest rate is calculated by adjusting for the effects of inflation when compared to the nominal interest rate. The calculation formula is simple, as it only requires subtracting the rate of inflation from the nominal interest rate. The value left after subtraction is the real interest rate.


A tax interest calculator determines the amount of interest owed on taxes that are paid late, as seen on the New York State Department of Taxation and Finance website. Several state tax websites, including New York and Pennsylvania, provide tax interest calculators, as do third-party services.


Interest expense is calculated as the interest rate multiplied by the amount of the outstanding principal of the debt. Defined by Investopedia, interest expense is the cost incurred by an entity on borrowed funds.


Loan interest rates can be calculated with a loan amortization calculator and by knowing whether interest rates are fixed or variable, according to About.com. These methods can help borrowers understand their monthly payments, how much of the payment consists of interest, and how much future payment


Many financial and government websites have compound interest calculators, such as Bankrate.com and Investor.gov. In addition, some mathematics-oriented websites also have compound interest calculators to illustrate particular uses of calculus in business, explains The Calculator Site.


To calculate the monthly interest on a mortgage, multiply the current loan balance by the yearly interest rate, and divide that number by 12. You can also use an online mortgage calculator to determine the interest on your mortgage loan.


Calculate daily interest on a loan by visiting AIE.org and using its online daily interest calculator. This tool is particularly designed for students with academic loans, notes AIE.org.