diff --git a/sdgb-api/src/helper/music_db/mod.rs b/sdgb-api/src/helper/music_db/mod.rs
index ba85346..7b5067d 100644
--- a/sdgb-api/src/helper/music_db/mod.rs
+++ b/sdgb-api/src/helper/music_db/mod.rs
@@ -93,7 +93,8 @@ impl Level {
             _ => return 0,
         };
 
-        (factor * difficulty_rank * achievement)
+        // when ach > 100.5%, calculate as 100.5%
+        (factor * difficulty_rank * achievement.min(Decimal::new(1005, 1)))
             .floor()
             .try_into()
             .unwrap_or_default()