The manuscript presents a Visual Basic® for Applications function that operates within Microsoft Office Excel® to return the area below the curve for a given F within a specified non-central F distribution. The function will be of use to Excel users without programming experience wherever a noncentral F distribution is required, such as conducting power analyses for analysis of variance designs and constructing confidence intervals on effect sizes. Tests show the function to produce results comparable to those obtained with the commercial software SPSS and the popular free R environment for statistical computing. Spreadsheets for use in Excel and OpenOffice Calc® are included with example usages.