diff --git a/homeassistant/helpers/template.py b/homeassistant/helpers/template.py
index 150d049b1b8..916d203782a 100644
--- a/homeassistant/helpers/template.py
+++ b/homeassistant/helpers/template.py
@@ -1939,6 +1939,7 @@ class TemplateEnvironment(ImmutableSandboxedEnvironment):
         self.globals["unpack"] = struct_unpack
         self.globals["slugify"] = slugify
         self.globals["iif"] = iif
+        self.tests["is_number"] = is_number
         self.tests["match"] = regex_match
         self.tests["search"] = regex_search
 
diff --git a/tests/helpers/test_template.py b/tests/helpers/test_template.py
index dd6d29a8c95..42834b3c149 100644
--- a/tests/helpers/test_template.py
+++ b/tests/helpers/test_template.py
@@ -314,6 +314,12 @@ def test_isnumber(hass, value, expected):
         )
         == expected
     )
+    assert (
+        template.Template("{{ value is is_number }}", hass).async_render(
+            {"value": value}
+        )
+        == expected
+    )
 
 
 def test_rounding_value(hass):