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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.

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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.

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To use a U.S. savings bond calculator, enter the information from the face of the bond into the calculator, and click on Calculate. The calculator displays the current value of the bonds, explains TreasuryDirect.

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Interest on U.S. savings bonds is compounded semi-annually. Cashing out the savings bond before a defined time period relinquishes the interest earned, according to Kiplinger.

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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

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Many finance websites, including Investopedia, CalculatorEdge and NCalculators.com, offer compounded annual growth rate calculators for their users. All of these sites require the user to input information essential for calculation of the compound annual growth rate.

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A compound refers to any substance that contains two or more elements that have been joined together chemically. All compounds are molecules; however, not all molecules are compounds. Molecules such as O2 or H2 are not considered compounds because they only contain a single element.

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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.

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Consumers can calculate the current value of their savings bonds by using the Savings Bond Calculator available on the official Treasury Direct website. This tool is accessible under the Tools tab on the website and gives consumers the ability to find the value of bonds in other months.

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The formula for interest compounded annually is FV = P(1+r)n, where P is the principal, or the amount deposited, r is the annual interest rate, and n is the number of years the money is in the bank. FV is the amount of money the depositor would have after n years, or the future value of that investm