diff --git a/trees/bt_height.py b/trees/bt_height.py
new file mode 100644
index 0000000..65fa688
--- /dev/null
+++ b/trees/bt_height.py
@@ -0,0 +1,9 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# author: bt3gl
+
+def height(root):
+      if not root:
+            return -1
+      return 1 + max(height(root.left), height(root.right))
+