How to Fix an Excel Line Chart Showing Incorrectly High Values
Question details
The user needs to correct a line chart that displays inflated or incorrectly high values after adding a new data series.
- Product
- Excel
- Device & OS
- not provided
- Scenario
- Adding a new data series to an existing line chart.
- Observed behavior
- The chart plots values much higher than the actual data points, likely because the data series are stacking on top of each other.
Select your chart and verify the actual values in your source data table to confirm whether the displayed points are summing together instead of plotting independently.
Change the Chart Type from Stacked Line to Regular Line
This is the most common fix. A stacked line chart adds the values of each series together, causing them to appear artificially high.
When you add a new data series to a Stacked Line chart, Excel cumulates the values. For example, if Series 1 is 50 and Series 2 is 40, Series 2 will be plotted at 90. Changing to a standard Line chart resolves this by plotting each series on the exact value of the Y-axis.
Click anywhere on the problematic line chart to select it and reveal the Chart Tools on the ribbon.
Go to the 'Chart Design' (or 'Design') tab located at the top of the Excel window.
Click on the 'Change Chart Type' button found in the Type group on the right side of the ribbon.
In the dialog box, select 'Line' from the left pane. Choose the first option, 'Line' (ensure you do not select Stacked Line or 100% Stacked Line), and click 'OK'.
Create and Edit Accurate Line Charts with WPS Office
WPS Spreadsheet provides an intuitive chart editor that makes it easy to switch chart types, manage data series, and avoid visualization errors like unintended stacked lines.
- 1. Open your file: Open your spreadsheet in WPS Office and click on the chart you want to fix.
- 2. Access Chart Tools: Click the 'Chart Tools' tab that appears on the top ribbon menu.
- 3. Change Chart Type: Click 'Change Chart Type' and select the standard 'Line' chart icon from the gallery.
- 4. Apply changes: Confirm your selection to instantly correct the data visualization and plot values accurately.
Frequently Asked Questions
What is the difference between a Line chart and a Stacked Line chart?
A standard Line chart plots each data series independently against the vertical axis. A Stacked Line chart adds the values of the second series to the first, showing cumulative totals, which often leads to confusion if not intended.
Why did my chart automatically become a Stacked Line chart?
Excel might default to a stacked chart if the original chart was created as stacked, or if you accidentally selected the 'Stacked Line' template when inserting the chart or adding a new data series.
Can I put the new data series on a secondary axis instead?
Yes, if the new data series has a drastically different numerical scale (e.g., percentages vs. thousands), changing the chart type to a 'Combo' chart and checking the 'Secondary Axis' box for that specific series will fix scaling issues.
Will changing the chart type affect my underlying data?
No, changing the chart type only alters how the data is visually represented. Your original data in the spreadsheet cells remains completely unchanged.
