How to Measure Text in WordsProcessing .NET Standard

Updated on Jun 9, 2026

Environment

Version	Product	Author
2024.1.305	RadWordsProcessing	Yoan Karamanov

Description

This article shows how to measure text in WordsProcessing in the .NET Standard environment.

Solution

You can measure text by passing the text and font properties of the Run you want to insert to the MeasureText method of a Telerik.Windows.Documents.Spreadsheet.Extensibility.SpreadFixedTextMeasurer instance. Due to Font Limitations of the PdfProcessing library in .NET Standard, you must provide a FontsProvider implementation as well:

csharp

using System.Diagnostics;
using Telerik.Documents.Common.Model;
using Telerik.Documents.Core.Fonts;
using Telerik.Windows.Documents.Core.Fonts;
using Telerik.Windows.Documents.Core.TextMeasurer;
using Telerik.Windows.Documents.Extensibility;
using Telerik.Windows.Documents.Flow.FormatProviders.Docx;
using Telerik.Windows.Documents.Flow.Model;
using Telerik.Windows.Documents.Flow.Model.Editing;
using Telerik.Windows.Documents.Spreadsheet.Extensibility;

FontsProviderBase fontsProvider = new FontsProvider();
FixedExtensibilityManager.FontsProvider = fontsProvider;

SpreadTextMeasurerBase textMeasurer = new SpreadFixedTextMeasurer();

RadFlowDocument flowDocument = new RadFlowDocument();
RadFlowDocumentEditor editor = new RadFlowDocumentEditor(flowDocument);
Section section = editor.InsertSection();

#region Verdana, font size 16
//Verdana, font size 16
FontFamily fontFamily = new FontFamily("Verdana");
string text = "This is a sample text - Verdana";
int fontSize = 16;

//FontStyles.Normal, FontWeights.Normal
Paragraph paragraph = section.Blocks.AddParagraph();
TextProperties textProperties = new TextProperties(text, fontSize);
FontProperties fontProperties = new FontProperties(fontFamily, FontStyles.Normal, FontWeights.Normal);
TextMeasurementInfo measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
Run run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Normal;
run.FontWeight = FontWeights.Normal;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");

//FontStyles.Italic, FontWeights.Normal
paragraph = section.Blocks.AddParagraph();
fontProperties = new FontProperties(fontFamily, FontStyles.Italic, FontWeights.Normal);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Italic;
run.FontWeight = FontWeights.Normal;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");

//FontStyles.Normal, FontWeights.Bold
paragraph = section.Blocks.AddParagraph();
fontProperties = new FontProperties(fontFamily, FontStyles.Normal, FontWeights.Bold);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Normal;
run.FontWeight = FontWeights.Bold;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");

//FontStyles.Italic, FontWeights.Bold
paragraph = section.Blocks.AddParagraph();
fontProperties = new FontProperties(fontFamily, FontStyles.Italic, FontWeights.Bold);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Italic;
run.FontWeight = FontWeights.Bold;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");
#endregion

#region Arial, font size 12
//Arial, font size 12
fontFamily = new FontFamily("Arial");
fontSize = 12;
text = "This is a sample text - Arial";

//FontStyles.Normal, FontWeights.Normal
paragraph = section.Blocks.AddParagraph();
textProperties = new TextProperties(text, fontSize);
fontProperties = new FontProperties(fontFamily, FontStyles.Normal, FontWeights.Normal);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Normal;
run.FontWeight = FontWeights.Normal;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");

//FontStyles.Italic, FontWeights.Normal
paragraph = section.Blocks.AddParagraph();
fontProperties = new FontProperties(fontFamily, FontStyles.Italic, FontWeights.Normal);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Italic;
run.FontWeight = FontWeights.Normal;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");

//FontStyles.Normal, FontWeights.Bold
paragraph = section.Blocks.AddParagraph();
fontProperties = new FontProperties(fontFamily, FontStyles.Normal, FontWeights.Bold);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Normal;
run.FontWeight = FontWeights.Bold;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");

//FontStyles.Italic, FontWeights.Bold
paragraph = section.Blocks.AddParagraph();
fontProperties = new FontProperties(fontFamily, FontStyles.Italic, FontWeights.Bold);
measurementInfo = textMeasurer.MeasureText(textProperties, fontProperties);
run = paragraph.Inlines.AddRun(text);
run.Properties.FontFamily.LocalValue = new ThemableFontFamily(fontFamily);
run.FontStyle = FontStyles.Italic;
run.FontWeight = FontWeights.Bold;
run.FontSize = fontSize;
paragraph.Inlines.AddRun($" - Width: {Math.Round(measurementInfo.Size.Width, 2)}, Height: {Math.Round(measurementInfo.Size.Height, 2)}");
#endregion

// Save as docx and open
DocxFormatProvider docxFormatProvider = new DocxFormatProvider();
string outputPath = "output.docx";
File.WriteAllBytes(outputPath, docxFormatProvider.Export(flowDocument));

var psi = new ProcessStartInfo()
{
    FileName = outputPath,
    UseShellExecute = true
};
Process.Start(psi);

public class FontsProvider : FontsProviderBase
{
    public override byte[] GetFontData(FontProperties fontProperties)
    {
        string fontFileName = fontProperties.FontFamilyName + ".ttf";
        string fontFolder = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);

        //The fonts can differ depending on the file 
        if (fontProperties.FontFamilyName == "Verdana")
        {
            if (fontProperties.FontStyle == FontStyles.Italic && fontProperties.FontWeight == FontWeights.Bold)
            {
                fontFileName = $"verdanaz.ttf";
            }
            else if (fontProperties.FontStyle == FontStyles.Italic)
            {
                fontFileName = $"verdanai.ttf";
            }
            else if (fontProperties.FontWeight == FontWeights.Normal)
            {
                fontFileName = "verdana.ttf";
            }
            else if (fontProperties.FontWeight == FontWeights.Bold)
            {
                fontFileName = $"verdanab.ttf";
            }
        }

        else if (fontProperties.FontFamilyName == "Arial")
        {
            if (fontProperties.FontStyle == FontStyles.Italic && fontProperties.FontWeight == FontWeights.Bold)
            {
                fontFileName = $"arialbi.ttf";
            }
            else if (fontProperties.FontStyle == FontStyles.Italic)
            {
                fontFileName = $"ariali.ttf";
            }
            else if (fontProperties.FontWeight == FontWeights.Normal)
            {
                fontFileName = "arial.ttf";
            }
            else if (fontProperties.FontWeight == FontWeights.Bold)
            {
                fontFileName = $"arialbd.ttf";
            }
        }

        //...add more fonts if needed... 

        DirectoryInfo directory = new DirectoryInfo(fontFolder);
        FileInfo[] fontFiles = directory.GetFiles();

        var fontFile = fontFiles.FirstOrDefault(f => f.Name.Equals(fontFileName, StringComparison.InvariantCultureIgnoreCase));
        if (fontFile != null)
        {
            string targetPath = fontFile.FullName;
            using (FileStream fileStream = File.OpenRead(targetPath))
            {
                using (MemoryStream memoryStream = new MemoryStream())
                {
                    fileStream.CopyTo(memoryStream);
                    return memoryStream.ToArray();
                }
            }
        }

        return null;
    }
}

Result

See Also

• PdfProcessing Fonts
• FontsProvider Implementation
• PdfProcessing Cross-Platform Fonts
• WordsProcessing Measure Text in .NET Framework
• SpreadProcessing Text Measuring