diff --git a/internal/modules/production/recordings/services/recording.service.go b/internal/modules/production/recordings/services/recording.service.go
index 61f96e81..c3e21770 100644
--- a/internal/modules/production/recordings/services/recording.service.go
+++ b/internal/modules/production/recordings/services/recording.service.go
@@ -1692,7 +1692,8 @@ func (s *recordingService) computeAndUpdateMetrics(ctx context.Context, tx *gorm
 
 	var eggMass float64
 	if remainingChick > 0 && totalEggWeightGrams > 0 {
-		eggMass = (totalEggWeightGrams / remainingChick) / 1000
+		// totalEggWeightGrams is in grams; egg mass is grams per hen.
+		eggMass = totalEggWeightGrams / remainingChick
 		updates["egg_mass"] = eggMass
 		recording.EggMass = &eggMass
 	} else {