diff --git a/pflaenzli/pflaenzli/utils/distance.py b/pflaenzli/pflaenzli/utils/distance.py
new file mode 100644
index 0000000..f0c21a8
--- /dev/null
+++ b/pflaenzli/pflaenzli/utils/distance.py
@@ -0,0 +1,16 @@
+from geopy.distance import distance
+import os
+from pandas import read_pickle
+
+path = os.path.dirname(os.path.abspath(__file__))
+
+df = read_pickle(os.path.join(path, 'plz.pkl'))
+
+
+def calculate_distance(zip_1, zip_2):
+    zip_1_coords = tuple(df[df.index == zip_1].values)
+    zip_2_coords = tuple(df[df.index == zip_2].values)
+
+    dist = distance((zip_1_coords), (zip_2_coords)).kilometers
+
+    return None if dist > 400 else dist
diff --git a/pflaenzli/pflaenzli/utils/plz.pkl b/pflaenzli/pflaenzli/utils/plz.pkl
new file mode 100644
index 0000000..44cb42d
Binary files /dev/null and b/pflaenzli/pflaenzli/utils/plz.pkl differ