diff --git a/src/MigrationTools.Clients.TfsObjectModel/Tools/FieldMappingTool/FieldMaps/FieldCalculationMap.cs b/src/MigrationTools.Clients.TfsObjectModel/Tools/FieldMappingTool/FieldMaps/FieldCalculationMap.cs
index 53160fa6b..785bd16ce 100644
--- a/src/MigrationTools.Clients.TfsObjectModel/Tools/FieldMappingTool/FieldMaps/FieldCalculationMap.cs
+++ b/src/MigrationTools.Clients.TfsObjectModel/Tools/FieldMappingTool/FieldMaps/FieldCalculationMap.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Globalization;
 using Microsoft.Extensions.Logging;
@@ -82,10 +82,22 @@ internal override void InternalExecute(WorkItem source, WorkItem target)
                     }
 
                     // Convert field value to numeric
-                    if (!TryConvertToNumeric(fieldValue, out var numericValue))
-                    {
-                        Log.LogWarning("FieldCalculationMap: Source field '{SourceField}' with value '{FieldValue}' is not numeric on work item {WorkItemId}. Skipping calculation.", parameter.Value, fieldValue, source.Id);
-                        return;
+                    if (!TryConvertToNumeric(fieldValue, out var numericValue)) {
+
+                        switch (Config.parsingFallback) {
+                            case FieldCalculationMapParsingFallback.RaiseError:
+                                Log.LogError(
+                                    "FieldCalculationMap: Source field '{SourceField}' with value '{FieldValue}' is not numeric on work item {WorkItemId}. Skipping calculation.",
+                                    parameter.Value, fieldValue, source.Id);
+                                break;
+
+                            case FieldCalculationMapParsingFallback.ResetToZero:
+                                Log.LogWarning(
+                                    "FieldCalculationMap: Source field '{SourceField}' with value '{FieldValue}' is not numeric on work item {WorkItemId}. resetting the value to 0.0.",
+                                    parameter.Value, fieldValue, source.Id);
+                                numericValue = 0.0;
+                                break;
+                        }
                     }
 
                     parameterValues[parameter.Key] = numericValue;
@@ -216,4 +228,4 @@ private static bool TryConvertToTargetFieldType(object result, Field targetField
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/MigrationTools/Tools/FieldMappingTool/FieldMaps/FieldCalculationMapOptions.cs b/src/MigrationTools/Tools/FieldMappingTool/FieldMaps/FieldCalculationMapOptions.cs
index 7a55e8a29..caaaef1e1 100644
--- a/src/MigrationTools/Tools/FieldMappingTool/FieldMaps/FieldCalculationMapOptions.cs
+++ b/src/MigrationTools/Tools/FieldMappingTool/FieldMaps/FieldCalculationMapOptions.cs
@@ -1,21 +1,31 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using MigrationTools.Tools.Infrastructure;
 
-namespace MigrationTools.Tools
-{
+namespace MigrationTools.Tools {
+    public enum FieldCalculationMapParsingFallback {
+        RaiseError,
+        ResetToZero
+    }
+
     /// <summary>
     /// Performs mathematical calculations on numeric fields using NCalc expressions during migration.
     /// </summary>
     /// <status>ready</status>
     /// <processingtarget>Work Item Field</processingtarget>
-    public class FieldCalculationMapOptions : FieldMapOptions
-    {
+    public class FieldCalculationMapOptions : FieldMapOptions {
         /// <summary>
         /// Gets or sets the NCalc expression to evaluate. Variables in the expression should be enclosed in square brackets (e.g., "[x]*2").
         /// </summary>
         /// <default>null</default>
         public string expression { get; set; }
 
+        /// <summary>
+        /// Gets or sets the parsing fallback.
+        /// </summary>
+        /// <default>null</default>
+        public FieldCalculationMapParsingFallback parsingFallback { get; set; } =
+            FieldCalculationMapParsingFallback.RaiseError;
+
         /// <summary>
         /// Gets or sets a dictionary mapping variable names used in the expression to source field reference names.
         /// </summary>
@@ -31,23 +41,21 @@ public class FieldCalculationMapOptions : FieldMapOptions
         /// <summary>
         /// Sets example configuration defaults for documentation purposes.
         /// </summary>
-        public void SetExampleConfigDefaults()
-        {
+        public void SetExampleConfigDefaults() {
             ApplyTo = new List<string>() { "SomeWorkItemType" };
             expression = "[x]*2";
-            parameters = new Dictionary<string, string>
-            {
+            parameters = new Dictionary<string, string> {
                 { "x", "Custom.FieldB" }
             };
             targetField = "Custom.FieldC";
+            parsingFallback = FieldCalculationMapParsingFallback.RaiseError;
         }
 
         /// <summary>
         /// Initializes a new instance of the FieldCalculationMapOptions class.
         /// </summary>
-        public FieldCalculationMapOptions()
-        {
+        public FieldCalculationMapOptions() {
             parameters = new Dictionary<string, string>();
         }
     }
-}
\ No newline at end of file
+}