Repeat step 3 afterwards.How to get the trendline equation in an excel graph can sometimes be challenging to get, however, in this article we will cover two methods that will allow you to get the trendline equation or line of best fit for some linear data.Īll lines can be described using the general linear equation listed below In this case change the cell reference type of the "known x" and "known y" values as described in step 2, using F4. Note: If you receive a #VALUE! error, check if the "known x" and/or "known y" values were auto-filled incorrectly - you may have used relative references when setting up the formula. Select the first value of the new trendline and copy the function by using Excel's Auto Fill feature, dragging the fill handle in the cell's lower right corner to the right until the cell of the last value is selected as well. This way the selection will stay exactly the same when this formula is copied and will not be adjusted according to the new position.
Note: By pressing F4 the cell reference type of the selected cells will change to absolute cell references. Select the first x value (e.g., "B1") and press ENTER. Select all "known x" values and press F4 (e.g., "$B$1:$D$1"). To see the correct character for your region refer to the Excel tooltip appearing while you enter the formula). (Note that the character expected by Excel as an arguments separator depends on your Windows regional settings. Select all "known y" values and press F4 (e.g., "$B$3:$D$3").Įnter Excel's arguments separator, e.g., "," (comma). Type " =TREND(" or use the Insert Function ( fx) menu in Excel.
Open the internal datasheet and add a new series, e.g., "Trendline 1".Ĭalculate the first value of the trendline using the TREND function: To create a trendline in a line chart, add a new series to the line chart, then calculate its values to form a trendline, e.g., by using the TREND function of Excel:
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