


Interest Formulas
 Average Percentage Yield


APY = 100 [(1 + I/P)^{n}
 1]



For example: the
account earned $1,347.46 interest for the oneyear period beginning January
1 and ending January 1 of the following year (365 days), and the principal
balance was $25,000. The calculation is as follows:




Open Annual Percentage Yield Spreadsheet  