diff --git a/src/ray/common/file_system_monitor.cc b/src/ray/common/file_system_monitor.cc
index 014596679327..4a5ee7fd413f 100644
--- a/src/ray/common/file_system_monitor.cc
+++ b/src/ray/common/file_system_monitor.cc
@@ -102,10 +102,15 @@ bool FileSystemMonitor::OverCapacityImpl(
     return false;
   }
 
+  // Convert bytes to GB
+  const double available_gb =
+      static_cast<double>(space_info->available) / (1024 * 1024 * 1024);
+  double capacity_gb = static_cast<double>(space_info->capacity) / (1024 * 1024 * 1024);
+
   std::ostringstream ostr;
   ostr << path << " is over " << capacity_threshold_ * 100
-       << "\% full, available space: " << space_info->available
-       << "; capacity: " << space_info->capacity
+       << "\% full, available space: " << available_gb << " GB"
+       << "; capacity: " << capacity_gb << " GB"
        << ". Object creation will fail if spilling is required.";
   RAY_EVENT_EVERY_MS(ERROR, "Out of Disk", 10 * 1000) << ostr.str();
   RAY_LOG_EVERY_MS(ERROR, 10 * 1000) << ostr.str();