How to Make Logarithmic Graphs on Excel

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Microsoft Excel contains a powerful graph utility that can make professional-looking charts in seconds. A logarithmic scale is a scale that represents the logarithm of a quantity instead of the quantity itself. Logarithms can come in handy when referencing a large range of values on a graph. Although you can create a variety of graphs in Excel, the only chart type that supports log-log graphs, where logarithmic scales are on both the y- and x-axis, is the scatter graph.

Things You'll Need

  • Existing Excel datasheet with X and Y values
  • Highlight the data on the datasheet by clicking at the top left and then dragging the cursor to the bottom right.

  • Click "Insert" and then click "Scatter." Click the first scatter icon and Excel inserts a scatter chart into your spreadsheet.

  • Right-click the scale of the x-axis and then click "Format Axis." Click the "Axis Options" tab and then click the "Logarithmic Scale" check box.

  • Right-click the scale of the y-axis and then click "Format Axis." Click the "Axis Options" tab and then click the "Logarithmic Scale" check box.

Tips & Warnings

  • In previous versions of Excel, the "Logarithmic Scale" check box is located in the "Format Axis" box on the "Scale" tab.

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