diff --git a/ql/src/queries/summary/NumberOfSuccesfullyExtractedFiles.ql b/ql/src/queries/summary/NumberOfSuccesfullyExtractedFiles.ql
new file mode 100644
index 00000000000..e89f1350962
--- /dev/null
+++ b/ql/src/queries/summary/NumberOfSuccesfullyExtractedFiles.ql
@@ -0,0 +1,13 @@
+/**
+ * @id rb/summary/number-of-successfully-extracted-files
+ * @name Total number of files that were extracted without error.
+ * @description The total number of Ruby code files that we extracted without
+ *   encountering any extraction errors
+ * @kind metric
+ * @tags summary
+ */
+
+import ruby
+import codeql_ruby.Diagnostics
+
+select count(File f | not exists(ExtractionError e | e.getLocation().getFile() = f))