Driver Intervention Programs Franklin County. The function E1(u) is known as the exponential integral. Introduces a method of aquifer test using Excel spreadsheet. Syntax EXP(number) The EXP function syntax has the following arguments: Contico Truck Tool Box Replacement Locks. Description Returns e raised to the power of number. Applies To: Excel for Office 365 Excel for Office 365 for Mac Excel 2016 Excel 2013 Excel 2010 Excel 2007 Excel 2016 for Mac Excel for Mac 2011 Excel Online Excel for iPad Excel for iPhone Excel for Android tablets Excel 2019 for Mac Excel for Android phones Excel Mobile Excel Starter 2010 This article describes the formula syntax and usage of the EXP function in Microsoft Excel.