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On the Number tab, click Number in the Category list, and then change the Decimal places setting to 30 or less.Double-click the trendline equation or R-squared text.Method 2: Microsoft Office Excel 2003 and earlier versions of Excel

y A exp (-bx) You can use the LINEST () function in excel to do that if you linearize the equation: lny lnA + bx A scatterplot with a linear trendline will also give you the coefficient. In the Category list, click Number, and then change the Decimal places setting to 30 or less. 1 You probably need to fit your table to an exponential function that has a negative coefficient for the variable of the exponent, i.e.The trendline generated automatically by Excel only draws the line and prints the calculated coefficients. Right-click the trendline equation or the R-squared text, and then click Format Trendline Label. A moving average trendline uses this equation: The number of points in a moving average trendline equals the total number of points in the series, minus the number you specify for the period. 1 Answer Sorted by: 2 Looking at your picture, it seems that you have very few points and finding the largest of them is not enough.Open the worksheet that contains the chart.To display a greater number of digits, use one of the following methods: Method 1: Microsoft Office Excel 2007 How to Find the Equation of a Trendline in Excel (3 Suitable Ways) Add Multiple Trendlines in Excel (With Quick Steps) How to Extrapolate Trendline in Excel (4 Quick Methods) 5. The trendline equation and R-squared value are initially displayed as rounded to five digits. This article explains how to display more digits in the coefficients. For some purposes, this may not be a sufficient number of significant figures. When you add a trendline to a chart, and then display the equation and R-squared value for the trendline, the equation shows only the first five digits of each coefficient.