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Asked: 2026-05-18T07:17:30+00:00

Lets say I render the character A to the screen with a size 14

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Lets say I render the character “A” to the screen with a size 14 font in Arial Regular. Is there a way in C# to calculate how many pixels wide it is?

The way I’m rendering text is through ESRI’s ArcEngine which makes calls to GDI or GDI+ (I don’t know which) in a round about fashion via the DynamicDisplay engine.

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  1. Editorial Team

    It depends on the rendering engine being used. .NET may use GDI or GDI+. Switching can be done by setting the UseCompatibleTextRendering property accordingly or calling the Application.SetCompatibleTextRenderingDefault method.

    When using GDI+ you should use MeasureString:

    string s = "A sample string";

SizeF size = e.Graphics.MeasureString(s, new Font("Arial", 24));

    When using GDI (i.e. the native Win32 rendering) you should use the TextRenderer class:

    SizeF size = TextRenderer.MeasureText(s, new Font("Arial", 24));

    More details are described in this article:

    Text Rendering: Build World-Ready Apps Using Complex Scripts In Windows Forms Controls

    Note that the above talks about Windows Forms. In WPF you would be using FormattedText

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