diff --git a/homeassistant/components/sensor/websocket_api.py b/homeassistant/components/sensor/websocket_api.py
index 2110ccc7253..92df6fa69e9 100644
--- a/homeassistant/components/sensor/websocket_api.py
+++ b/homeassistant/components/sensor/websocket_api.py
@@ -16,6 +16,8 @@ from .const import (
     SensorDeviceClass,
 )
 
+_NUMERIC_DEVICE_CLASSES = list(set(SensorDeviceClass) - NON_NUMERIC_DEVICE_CLASSES)
+
 
 @callback
 def async_setup(hass: HomeAssistant) -> None:
@@ -55,7 +57,6 @@ def ws_numeric_device_classes(
     hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict[str, Any]
 ) -> None:
     """Return numeric sensor device classes."""
-    numeric_device_classes = set(SensorDeviceClass) - NON_NUMERIC_DEVICE_CLASSES
     connection.send_result(
-        msg["id"], {"numeric_device_classes": list(numeric_device_classes)}
+        msg["id"], {"numeric_device_classes": _NUMERIC_DEVICE_CLASSES}
     )