diff --git a/src/bluetooth_data_tools/distance.py b/src/bluetooth_data_tools/distance.py
index cd85f69..6203201 100644
--- a/src/bluetooth_data_tools/distance.py
+++ b/src/bluetooth_data_tools/distance.py
@@ -1,5 +1,3 @@
-from typing import cast
-
 MAX_THEORETICAL_DISTANCE = 400.0
 
 
@@ -7,8 +5,8 @@ def calculate_distance_meters(power: int, rssi: int) -> float | None:
     """Calculate the distance in meters between the scanner and the device."""
     if rssi == 0 or power == 0:
         return None
-    if (ratio := rssi * 1.0 / power) < 1.0:
-        distance = pow(ratio, 10)
+    if (ratio := rssi / power) < 1.0:
+        distance = ratio**10
     else:
-        distance = cast(float, 0.89976 * pow(ratio, 7.7095) + 0.111)
+        distance = 0.89976 * ratio**7.7095 + 0.111
     return min(distance, MAX_THEORETICAL_DISTANCE)