Index: tools/sancov/sancov.cc
===================================================================
--- tools/sancov/sancov.cc
+++ tools/sancov/sancov.cc
@@ -885,7 +885,7 @@
 
       OS << "<tr><td><a href=\"#" << anchorName(FileName) << "\">"
          << stripPathPrefix(FileName) << "</a></td>"
-         << "<td>" << CovPct << "%</td>"
+         << "<td>" << format("%03lu", CovPct) << "%</td>"
          << "<td>" << FC.first << " (" << FC.second << ")"
          << "</tr>\n";
     }
@@ -923,7 +923,7 @@
         std::string FunctionName = P.first.FunctionName;
 
         OS << "<div class='fn' style='order: " << P.second << "'>";
-        OS << "<span class='pct'>" << P.second << "%</span>&nbsp;";
+        OS << "<span class='pct'>" << format("%03lu", P.second) << "%</span>&nbsp;";
         OS << "<span class='name'><a href=\"#"
            << anchorName(FileName + "::" + FunctionName) << "\">";
         OS << escapeHtml(FunctionName) << "</a></span>";