Convert Excel Cell coords to x,y ( C# )

In C#, I need code that will convert an Excel column / row coordinate to zero-based x,y (ordinal) values.  Assume no VSTO or Interop support.

I need to support the following:

A1 (0, 0)
A500  (500, 0)
AA1   (0, 26)
AA500 (500, 26)
XFD5 (5, 16384)   (which is as far as I can go, column-wise)

*** NOTE:  in Excel you can obtain the column value with formula:


But like I said, I need to be able to do this programmatically in C# without the benefit of Excel Interop or VSTO.

Thank you!
Tom KnowltonWeb developerAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Kyle AbrahamsSenior .Net DeveloperCommented:
the row is the numeric portion.
The column name is the
from:  (gets the name and number separately) and (converts column name to a number)

        	       string address ="AA2";
           string col;
           int ColNum;
           int row;

          StringBuilder sb = new StringBuilder( );
        int i= 0;
           for( ; i < address.Length
                   && ! Char.IsDigit( address[ i ] ) 
                ; ++i )
               sb.Append( address[ i ] );

           col = sb.ToString( );
          ColNum = ExcelColumnNameToNumber(col);
           sb.Clear( );

           for ( ; i < address.Length
                    && Char.IsDigit( address[ i ] )
                 ; ++i )
               sb.Append( address[ i ] );

           row = Int32.Parse( sb.ToString( ) );
		Console.WriteLine(string.Format("({0},{1})", row, ColNum));
public static int ExcelColumnNameToNumber(string columnName)
    if (string.IsNullOrEmpty(columnName)) throw new ArgumentNullException("columnName");

    columnName = columnName.ToUpperInvariant();

    int sum = 0;

    for (int i = 0; i < columnName.Length; i++)
        sum *= 25;
        sum += (columnName[i] - 'A' + 1);

    return sum;

Open in new window

Dot Net Fiddle:
Fernando SotoRetiredCommented:
This should do what you need.
using System.Text.RegularExpressions;

// Test Excel Cell
string excelCell = "A500";
// Get the Excel column name
string colName = Regex.Split(excelCell, @"\d")[0].ToUpper();
// Get the Excel row number
long y = 0;
long.TryParse(Regex.Match(excelCell, @"\d+").Value, out y);
// Get column index as long int 
int x = colName.Select((c, i) =>
    ((c - 'A' + 1) * ((int)Math.Pow(26, colName.Length - i - 1)))).Sum();

Open in new window


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Tom KnowltonWeb developerAuthor Commented:
Thank you
Fernando SotoRetiredCommented:
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.