DocuSign X and Y positions - docusignapi

Question

I have a Pdf XFA document populating from my system. When I extract X and Y positions for the signature field in XML it's in millimeter. DocuSign uses pixels for X and Y coordinates. When I convert Millimeter to a pixel in DocuSign it won't position correctly. Do anyone knows how to convert it correctly for DocuSign? Thanks in Advance.
Adobe XFA XML for Signature field
C# Code
EnvelopeDefinition envDef = new EnvelopeDefinition();
envDef.EmailSubject = "[DocuSign C# SDK] - Please sign this doc";
// Add a document to the envelope
DocuSign.eSign.Model.Document doc = new DocuSign.eSign.Model.Document();
doc.DocumentBase64 = System.Convert.ToBase64String(docuSignfileBytes);
doc.Name = FullFileName;
doc.DocumentId = "1";
envDef.Documents = new List<DocuSign.eSign.Model.Document>();
envDef.Documents.Add(doc);
// Add a recipient to sign the documeent
Signer signer = new Signer();
signer.Name = recipientName;
signer.Email = recipientEmail;
signer.RecipientId = "1";
signer.Tabs = new Tabs();
signer.Tabs.SignHereTabs = new List<SignHere>();
//Loading XML data to string builder
string[] delim = { Environment.NewLine, "\n" }; // "\n" added in case you manually appended a newline
string[] lines = sb.ToString().Split(delim, StringSplitOptions.None);
foreach (string line in lines)
{
if (line.Contains("SignatureField") == true)
{
if (line.Contains("x=") == true)
{
string[] readX = line.Trim().Split(' ');
for (int i = 0; i < readX.Length; i++)
{
if (readX[i].Contains("x=") == true)
{
strXLocation = readX[i].Substring(3, readX[i].Length - 7);
if(strXLocation.Length > 1)
{
double iXLoc = 0;
iXLoc = Convert.ToDouble(strXLocation) * Convert.ToDouble("3.77");
strXLocation = iXLoc.ToString();
strXLocation = strXLocation.Substring(0, strXLocation.IndexOf('.', 0));
}
}
}
}
if (line.Contains("y=") == true)
{
string[] readY = line.Trim().Split(' ');
for (int i = 0; i < readY.Length; i++)
{
if (readY[i].Contains("y=") == true)
{
strYLocation = readY[i].Substring(3, readY[i].Length - 7);
if(strYLocation.Length > 1)
{
double dYLoc = 0;
dYLoc = Convert.ToDouble(strYLocation) * Convert.ToDouble("3.77");
strYLocation = dYLoc.ToString();
strYLocation = strYLocation.Substring(0, strYLocation.IndexOf('.', 0));
}
}
}
}
if (strXLocation.Length > 1 && strYLocation.Length > 1)
{
// Create a |SignHere| tab somewhere on the document for the recipient to sign
SignHere signHere = new SignHere();
signHere.DocumentId = "1";
signHere.PageNumber = "2";
signHere.RecipientId = "1";
signHere.XPosition = strXLocation;
signHere.YPosition = strYLocation;
signer.Tabs.SignHereTabs.Add(signHere);
strXLocation = string.Empty;
strYLocation = string.Empty;
}
}
}
// =======================================
envDef.Recipients = new Recipients();
envDef.Recipients.Signers = new List<Signer>();
envDef.Recipients.Signers.Add(signer);
// set envelope status to "created" send to Draft envelop
envDef.Status = "sent"; //Draft Envelop //"sent";
// Use the EnvelopesApi to send the signature request!
EnvelopesApi envelopesApi = new EnvelopesApi();
EnvelopeSummary envelopeSummary = envelopesApi.CreateEnvelope(accountId, envDef);
EnvelopeID = envelopeSummary.EnvelopeId;