diff --git a/local_coverage_rate.sh b/local_coverage_rate.sh
new file mode 100755
index 0000000..33c06a7
--- /dev/null
+++ b/local_coverage_rate.sh
@@ -0,0 +1,87 @@
+#!/bin/bash
+
+# Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Calculates the test-coverage percentage for non-test files in the
+# update_engine directory. Requires a file 'app.info' to contain the
+# results of running the unittests while collecting coverage data.
+
+cat app.info | awk -F '[,:]' '
+
+BEGIN { OFS = ":"; }
+
+/^SF:/{ FILEN = $2; }
+
+/^end_of_record$/{ FILEN = ""; }
+
+/^DA:/{ print FILEN, $2, $3; }
+
+' | sort | awk -F : '
+BEGIN {
+  OFS = ":";
+  FILEN = "";
+  LINE = "";
+  HITS = 0;
+}
+{
+  NEWFILEN = $1;
+  NEWLINE = $2;
+  if ((NEWFILEN == FILEN) && (NEWLINE == LINE)) {
+    HITS += $3
+  } else {
+    if (FILEN != "") {
+      print FILEN, LINE, HITS;
+    }
+    FILEN = NEWFILEN;
+    LINE = NEWLINE;
+    HITS = $3;
+  }
+}
+' | grep '^.*\/trunk\/src\/platform\/update_engine\/' | \
+fgrep -v '_unittest.cc:' | \
+fgrep -v '/test_utils.' | \
+fgrep -v '/test_http_server.cc' | \
+fgrep -v '/testrunner.cc' | \
+fgrep -v '/mock' | \
+fgrep -v '.pb.cc' | \
+awk -F : '
+
+function printfile() {
+  if (FNAME != "")
+    printf "%-40s %4d / %4d: %5.1f%%\n", FNAME, FILE_GOOD_LINES,
+        (FILE_BAD_LINES + FILE_GOOD_LINES),
+        (FILE_GOOD_LINES * 100) / (FILE_BAD_LINES + FILE_GOOD_LINES);
+}
+
+BEGIN {
+  FNAME = "";
+  FILE_BAD_LINES = 0;
+  FILE_GOOD_LINES = 0;
+}
+{
+  // calc filename
+  ARR_SIZE = split($1, PARTS, "/");
+  NEWFNAME = PARTS[ARR_SIZE];
+  if (NEWFNAME != FNAME) {
+    printfile();
+    FILE_BAD_LINES = 0;
+    FILE_GOOD_LINES = 0;
+    FNAME = NEWFNAME;
+  }
+  if ($3 == "0") {
+    BAD_LINES += 1;
+    FILE_BAD_LINES += 1;
+  } else {
+    GOOD_LINES += 1;
+    FILE_GOOD_LINES += 1;
+  }
+}
+
+END {
+  printfile();
+  print "---\nSummary: tested " GOOD_LINES " / " (BAD_LINES + GOOD_LINES);
+  printf "Test coverage: %.1f%%\n", ((GOOD_LINES * 100) / (BAD_LINES + GOOD_LINES));
+}
+'