diff --git a/src/applications/diffusion/conduit/DiffusionUpdateCoverageConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionUpdateCoverageConduitAPIMethod.php
--- a/src/applications/diffusion/conduit/DiffusionUpdateCoverageConduitAPIMethod.php
+++ b/src/applications/diffusion/conduit/DiffusionUpdateCoverageConduitAPIMethod.php
@@ -70,6 +70,7 @@
     $conn = $repository->establishConnection('w');
 
     $sql = array();
+    $dir_info = array();
     foreach ($coverage as $path => $coverage_info) {
       $sql[] = qsprintf(
         $conn,
@@ -78,6 +79,34 @@
         $path_map[$path],
         $commit->getID(),
         $coverage_info);
+
+      // add the coverage info for this file to the aggregate coverage info for
+      // all of its parent directories
+      $normal_path = DiffusionPathIDQuery::normalizePath($path);
+      $path_parts = explode('/', $normal_path);
+      array_pop($path_parts);
+      $dir = '';
+      foreach ($path_parts as $part) {
+        $dir .= '/'.$part;
+        if (isset($dir_info[$dir])) {
+          $dir_info[$dir] .= $coverage_info;
+        } else {
+          $dir_info[$dir] = $coverage_info;
+        }
+      }
+    }
+
+    $dir_map = id(new DiffusionPathIDQuery(array_keys($dir_info)))
+      ->loadPathIDs();
+
+    foreach ($dir_info as $dir => $coverage_info) {
+      $sql[] = qsprintf(
+        $conn,
+        '(%d, %d, %d, %s)',
+        $branch->getID(),
+        $dir_map[$dir],
+        $commit->getID(),
+        $coverage_info);
     }
 
     $table_name = 'repository_coverage';
diff --git a/src/applications/diffusion/controller/DiffusionLastModifiedController.php b/src/applications/diffusion/controller/DiffusionLastModifiedController.php
--- a/src/applications/diffusion/controller/DiffusionLastModifiedController.php
+++ b/src/applications/diffusion/controller/DiffusionLastModifiedController.php
@@ -66,8 +66,50 @@
       }
 
       $lint = $lint_query->execute();
+
+      $paths = array_keys($commits);
+      $path_map = id(new DiffusionPathIDQuery($paths))->loadPathIDs();
+
+      $commit_id = $drequest->loadCommit()->getID();
+      $coverage_rows = queryfx_all(
+        id(new PhabricatorRepository())->establishConnection('r'),
+        'SELECT * FROM %T
+          WHERE branchID = %d
+          AND pathID IN (%Ld)
+          AND commitID = %d',
+        PhabricatorRepository::TABLE_COVERAGE,
+        $branch->getID(),
+        $path_map,
+        $commit_id);
+      $coverage = array();
+      $path_map = array_flip($path_map);
+      $largest_dir = 0;
+      $files_total = 0;
+      foreach ($coverage_rows as $coverage_row) {
+        $covered_path = $path_map[$coverage_row['pathID']];
+        $report = $coverage_row['coverage'];
+        $cov = substr_count($report, 'C');
+        $uncov = substr_count($report, 'U');
+        $is_dir = substr($covered_path, strlen($covered_path) - 1, 1) === '/';
+        $coverage[$covered_path] = array(
+          'cov' => $cov,
+          'uncov' => $uncov,
+          'is_dir' => $is_dir,
+        );
+        $total = $cov + $uncov;
+        if ($total > $largest_dir && $is_dir) {
+          $largest = $total;
+        } else if (!$is_dir) {
+          $files_total += $total;
+        }
+      }
+      foreach ($coverage as $covered_path => $coverage_info) {
+        $coverage[$covered_path]['largest_dir'] = $largest_dir;
+        $coverage[$covered_path]['files_total'] = $files_total;
+      }
     } else {
       $lint = array();
+      $coverage = array();
     }
 
     $output = array();
@@ -79,7 +121,8 @@
         $prequest,
         $handles,
         $commit,
-        idx($lint, $path));
+        idx($lint, $path),
+        idx($coverage, $path));
     }
 
     return id(new AphrontAjaxResponse())->setContent($output);
@@ -89,7 +132,8 @@
     DiffusionRequest $drequest,
     array $handles,
     PhabricatorRepositoryCommit $commit = null,
-    $lint = null) {
+    $lint = null,
+    $coverage = null) {
     assert_instances_of($handles, 'PhabricatorObjectHandle');
     $viewer = $this->getRequest()->getUser();
 
@@ -151,6 +195,23 @@
         number_format($lint));
     }
 
+    if ($coverage !== null) {
+      $cov = $coverage['cov'];
+      $uncov = $coverage['uncov'];
+      $total = $cov + $uncov;
+      $largest = $coverage['largest'];
+      if ($total) {
+        $percentage = $cov / ($cov + $uncov);
+      } else {
+        $percentage = 0;
+      }
+      $width = ($total / $largest) * 100;
+      $percentage = (int)(100 * $percentage);
+      $percentage_display = sprintf('% 3d', $percentage);
+      $return['coverage'] = id(new AphrontProgressBarView())
+        ->setAlt(hsprintf('%d%%', $percentage_display));
+    }
+
     // The client treats these results as markup, so make sure they have been
     // escaped correctly.
     foreach ($return as $key => $value) {
diff --git a/src/applications/diffusion/view/DiffusionBrowseTableView.php b/src/applications/diffusion/view/DiffusionBrowseTableView.php
--- a/src/applications/diffusion/view/DiffusionBrowseTableView.php
+++ b/src/applications/diffusion/view/DiffusionBrowseTableView.php
@@ -74,6 +74,7 @@
 
       $dict = array(
         'lint'      => celerity_generate_unique_node_id(),
+        'coverage'  => celerity_generate_unique_node_id(),
         'commit'    => celerity_generate_unique_node_id(),
         'date'      => celerity_generate_unique_node_id(),
         'author'    => celerity_generate_unique_node_id(),
@@ -89,6 +90,7 @@
         $history_link,
         $browse_link,
         idx($dict, 'lint'),
+        $dict['coverage'],
         $dict['commit'],
         $dict['author'],
         $dict['details'],
@@ -112,6 +114,7 @@
     $branch = $this->getDiffusionRequest()->loadBranch();
     $show_lint = ($branch && $branch->getLintCommit());
     $lint = $request->getLint();
+    $show_coverage = $this->getDiffusionRequest()->loadCoverage();
 
     $view = new AphrontTableView($rows);
     $view->setHeaders(
@@ -119,6 +122,7 @@
         null,
         pht('Path'),
         ($lint ? $lint : pht('Lint')),
+        pht('Coverage'),
         pht('Modified'),
         pht('Author/Committer'),
         pht('Details'),
@@ -131,6 +135,7 @@
         '',
         '',
         '',
+        '',
         'wide',
         '',
       ));
@@ -139,6 +144,7 @@
         true,
         true,
         $show_lint,
+        $show_coverage,
         true,
         true,
         true,
@@ -150,6 +156,7 @@
         true,
         true,
         false,
+        false,
         true,
         false,
         true,