diff --git a/src/mesh/build.js b/src/mesh/build.js
index 7f746ab9..1edf9f98 100644
--- a/src/mesh/build.js
+++ b/src/mesh/build.js
@@ -346,9 +346,9 @@ function ui_build() {
                 h.div({ _: "" }),
                 h.div({ _: "count", class: "top" }),
                 h.div({ _: "vertex", class: "side" }),
-                h.label({ _: t_vert }),
+                h.label({ _: util.comma(t_vert) }),
                 h.div({ _: "face", class: "side" }),
-                h.label({ _: t_face }),
+                h.label({ _: util.comma(t_face) }),
             ])
         ])];
         // bind elements to selectlist div
diff --git a/src/mesh/util.js b/src/mesh/util.js
index 2148c991..4516e5bc 100644
--- a/src/mesh/util.js
+++ b/src/mesh/util.js
@@ -27,6 +27,13 @@ let util = mesh.util = {
         return uid.join('-');
     },
 
+    // add comma separator to 1000s
+    comma(val) {
+        let str = val.toString().split(".");
+        str[0] = str[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
+        return str.join(".");
+    },
+
     // merge repeated function calls like updates
     // that importantly take no arguments
     defer(fn, time = 50) {
@@ -150,4 +157,4 @@ let util = mesh.util = {
     }
 };
 
-})();
\ No newline at end of file
+})();