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Hexadecimal (Hex) to Decimal Lookup Table

Easily convert hex to decimal and back again with this convenient table

By steve on January 07, 2007.
Updated on January 22, 2012.
Viewed 149,214 times (128 times today).

Article Types	Article Types	Languages	Technologies	Topics
Reference	Snippet	C#	.NET	Web Design

C# Code to General Hex to Decimal Lookup Table

Contents

Following is the C# code I wrote to generate the hexadecimal to decimal lookup table found on page 1.

Add the method to the code-behind page of an ASPX page. Be sure to add a Label named lblOutput and don't forget 'using System.Text' because I use the StringBuilder class to speed things up a bit.

(Obviously, you can adapt this for Windows Forms or console application, etc...)

C# Method. Generate Decimal to Hexadecimal Lookup Table

Contents

public void GenerateHexDecConversionTable()
{
   StringBuilder sb = new StringBuilder();

   sb.Append("<table cellpadding=15 cellspacing=0 "
   + "border=1 border-color=gainsboro>");

   for (int i=0; i<256; i++)
   {
      if ( i%(16) == 0) // if we're beginning a new multiple of 16
      {
         if (i != 0) // if it's not the first multiple of 16
            sb.Append("</table cellpadding=4 cellspacing=0></td>");
         if ( i%64 == 0) // if we're beginning a new multiple of 64
         {
            if (i != 0) // if it's not the first multiple of 64
               sb.Append("</tr>");
            sb.Append("<tr>");
         }
         sb.Append("<td align=center><table>");
         sb.Append("<tr><td colspan=2><B>D: </b>"
          + i.ToString() + "-" + (i+15).ToString() 
          + "</td></tr>");
         sb.Append("<tr><td colspan=2><b>X: </b>" 
         + i.ToString("X") + "-" + (i+15).ToString("X") 
         + "</td></tr>");
         sb.Append("<tr><td align=center><b>Dec</b></td>"
         + "<td><b>Hex</b></td></tr>");
      }
      if (i%2 == 0)
      {
         sb.Append("<tr><td align=center "
         + "style='font-weight:bold;background-color:black;color:white;'>" 
         + i.ToString() + "</td><td align=center "
         + "style='font-weight:bold;background-color:white;color:black;'>" 
         + i.ToString("X") + "</td></tr>");
      }
      else
      {
         sb.Append("<tr><td align=center "
         + "style="
         + "'font-weight:bold;background-color:dimgray;color:white;'>" 
         + i.ToString() + "</td><td align=center "
         + "style="
         + "'font-weight:bold;background-color:gainsboro;color:black;'>" 
         + i.ToString("X") + "</td></tr>");
      }
   }

   sb.Append("</table></td></tr>");
   sb.Append("</table>");

   lblOutput.Text = sb.ToString();
}

User Comments (7)

Posted 2010 Jul 25 02:38 AM.

You are the greatest, I had the exact same problem, I did a little research and on the first link I clicked was this page with your table.

Charlie

Posted 2010 Oct 21 10:57 AM.

Great! thanks for sharing this.

Adam J. Mendoza

Posted 2011 Sep 28 13:44 PM.

This is also a great resource for looking up hex address number values. I'm currently studying IPv6 Addressing and that's how I came across this resource.

Thank you!

thirdeye

Posted 2012 Jan 12 04:36 AM.

Thanks bro, I needed a table to study because I am trainning to take my Network+ exam. I needed a way to look up BD in Hex cause I am learning IPv6. I really appreciate the help, thanks. Also to learn programming, do you have to be a math wiz? I am asking because I am actually thinking about becoming a programmer instead of computer tech. Thanks again and have a good day!

Darrell

Posted 2012 Jan 21 11:44 AM.

I LIKE THIS PORTION VERY MUCH SIR/MADAM THANKS VERY VERY THANKS

yasin

Posted 2012 Jan 24 17:07 PM.

Thanks a lot! It would be great too if you had the decimal normalized to 1 (a lot of programming languages use a 0-1 scale instead of 0 - 255). Three columns instead of just two? Thanks,

Spencer

Posted 2012 Feb 08 04:31 AM.

how do you covert hexardecimal to decimal

nikeel

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