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Compound interest in a savings account accelerates interest earnings by paying interest on the portion of the account balance made up of previously earned interest. Interest in a savings account accrues at a rate that varies among banks and may compound daily or monthly.

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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.

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Most of the major high street banks offer savings accounts with some form of compound interest, with Barclay's, CIT bank and Ally some examples, according to The Simple Dollar. Most accounts have different features, meaning that some savings accounts may be better suited to individuals than others,

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One formula for calculating yearly compound interest is M=P(1+i)n. "M" represents the final amount with the principal and interest combined, "P" represents the principal amount, "i" represents the interest rate, and "n" is the number of years invested.

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Bankrate publishes a list of the savings accounts offered by banks that have the highest interest rates. As of July 30, 2015, Synchrony Bank's interest rate of 1.05 percent is the highest rate on a savings account without minimum deposit. Credit unions tend to have high-yield savings accounts, recom

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As of 2015, the average savings account rate is 0.17 percent, according to U.S. News and World Reports. However, consumers who shop around are often able to find opportunities to earn more on their savings.

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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.

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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

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Compound interest is a financial term used to describe the process where the interest earned on a principal investment over a set period of time is added to the principal amount. The interest payable for the following periods is recalculated on the sum of the original investment and the previous int

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The difference between simple interest and compound interest is that simple interest builds only on the principal amount, while compound interest builds on both the principal and previously earned interest. Because of this, compound interest always yields greater profits.