diff --git a/matlab/@ucf/ucf.m b/matlab/@ucf/ucf.m
index 1958113..14a8451 100644
--- a/matlab/@ucf/ucf.m
+++ b/matlab/@ucf/ucf.m
@@ -170,6 +170,11 @@ classdef ucf < handle
       if obj.fileID<0
         error('Unable to open file: %s',obj.File);
       end
+      obj.fileBeg = ftell(obj.fileID);
+      fseek(obj.fileID,0,'eof');
+      obj.fileEnd = ftell(obj.fileID);
+      fseek(obj.fileID,0,'bof');
+      obj.FileSize = obj.fileEnd-obj.fileBeg;
       % Read the file header
       obj.readHeaderFile()
       % Scan through file to get the basic structure (steps/sets)
@@ -228,7 +233,9 @@ classdef ucf < handle
       if obj.fileID<0
         error('Unable to create file: %s',obj.File);
       end
-      %
+      obj.fileBeg = ftell(obj.fileID);
+      obj.fileEnd = ftell(obj.fileID);
+      obj.FileSize = obj.fileEnd-obj.fileBeg;
       switch par.Results.type
       case 'field'
         obj.typeID = obj.typeIDmatlabField;