diff --git a/examples/callgraph/func_size.py b/examples/callgraph/func_size.py
new file mode 100644
index 00000000..bdbdf8b7
--- /dev/null
+++ b/examples/callgraph/func_size.py
@@ -0,0 +1,13 @@
+# eg.
+# callgraph a.wasm|python3 func_size.py|sort -nr|head -10
+
+import json
+import sys
+
+
+j = json.load(sys.stdin)
+funcs = j["funcs"]
+for f in funcs:
+    if "expr_size" not in f:
+        continue
+    print(f"{f['expr_size']} {f['name']}")