diff --git a/gradation.py b/gradation.py
index 9990861..b2fc6a2 100755
--- a/gradation.py
+++ b/gradation.py
@@ -9,7 +9,7 @@ class Gradation:
     mg_per_liter: int
 
     def __init__(self, grams_per_liter: Union[float, int]):
-        self.mg_per_liter = int(grams_per_liter * 1000)
+        self.mg_per_liter = round(grams_per_liter * 1000)
 
     @property
     def grams_per_liter(self) -> float: