diff --git a/src/useq/_grid.py b/src/useq/_grid.py
index 67917199..7b86876b 100644
--- a/src/useq/_grid.py
+++ b/src/useq/_grid.py
@@ -419,11 +419,8 @@ def __iter__(self) -> Iterator[GridPosition]:  # type: ignore
         ):
             yield GridPosition(x, y, 0, 0, True)
 
-    def __len__(self) -> int:
-        return self.num_positions()
-
     def num_positions(self) -> int:
-        return len(list(self.__iter__()))
+        return self.num_points
 
 
 def _random_points_in_ellipse(