www.reference.com/article/calculate-interest-7bc34049e9ec9997

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.

www.reference.com/article/tax-interest-calculator-68519412cb172aad

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 ...

www.reference.com/article/calculate-interest-expense-7c2a798a7a6b468a

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.

www.reference.com/article/use-simple-interest-calculator-980f333005bcfa93

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 an...

www.reference.com/article/calculate-interest-loans-8f6532ffc3c50d73

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 interes...

www.reference.com/article/calculate-real-interest-rates-1d66a0a3835efaae

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 subtracti...

www.reference.com/article/compound-interest-calculators-8df49889cda1ea4a

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 ...