diff --git a/ql/src/queries/summary/LinesOfCode.ql b/ql/src/queries/summary/LinesOfCode.ql
new file mode 100644
index 00000000000..958a931a16d
--- /dev/null
+++ b/ql/src/queries/summary/LinesOfCode.ql
@@ -0,0 +1,13 @@
+/**
+ * @id rb/summary/lines-of-code
+ * @name Total lines of Ruby code in the database
+ * @description The total number of lines of Ruby code across all files,
+ *   including vendored code, tests. This query counts the lines of code,
+ *   excluding whitespace or comments.
+ * @kind metric
+ * @tags summary
+ */
+
+import ruby
+
+select sum(File f | | f.getNumberOfLinesOfCode())