Logarithmic scale

GemBox.Spreadsheet
1

I cannot find an option to set a value axis to use logarithmic scale. Did I miss it or does such an option not exist? In case in doesn’t exist, could it be added? Excel Charts do offer that option, so I’d hope it would a matter of exposing it via the API.

2

Hi,

We have added support for a logarithmic scale, please try again with this NuGet package:

Install-Package GemBox.Spreadsheet -Version 2026.2.108

Note that this is a hidden pre-released version, to install it you’ll need to run the above command on the NuGet Package Manager Console (Tools → NuGet Package Manager → Package Manager Console).

Also, try the following example:

var workbook = new ExcelFile();
var worksheet = workbook.Worksheets.Add("Logarithmic Scale");

var chart = worksheet.Charts.Add<ColumnChart>(ChartGrouping.Standard, 0, 0, 500, 500, LengthUnit.Pixel);
var series = chart.Series.Add("LogTest", [28, 3, 2, 2, 2]);
chart.SetCategoryLabels(["A", "B", "C", "D", "E"]);

var axis = chart.Axes.VerticalValue;
axis.LogBase = 10;

workbook.Save("LogarithmicScale.xlsx");

Does this solve your issue?

Regards,
Mario

3

Thank you for implementing this so quickly Mario! Much appreciated!!

We have updated to version 2026.2.108 and the ValueAxis.LogBase property works exactly as expected; this fully resolves my issue.

Kind regards, Markus