diff --git a/src/agents/realtime/_util.py b/src/agents/realtime/_util.py
index 52a3483e9..fc8ebc3f0 100644
--- a/src/agents/realtime/_util.py
+++ b/src/agents/realtime/_util.py
@@ -6,4 +6,4 @@
 def calculate_audio_length_ms(format: RealtimeAudioFormat | None, audio_bytes: bytes) -> float:
     if format and isinstance(format, str) and format.startswith("g711"):
         return (len(audio_bytes) / 8000) * 1000
-    return (len(audio_bytes) / 24 / 2) * 1000
+    return (len(audio_bytes) / 24000 / 2) * 1000