Hi Trojan,

There's probably an API, but the following works.

Add a pictureBox, set it to Visible=False and use the following code:
VB Code:
  1. Picture1.ScaleMode = vbPixels
  2.     Picture1.Font.Size = RichTextBox1.SelFontSize
  3.     Picture1.Font.Name = RichTextBox1.SelFontName
  4.    
  5.     MsgBox Picture1.TextHeight(RichTextBox1.SelText)

Added bonus, if needed, Picture1.TextWidth(RichTextBox1.SelText) gets the width.