diff --git a/lib/drawdxf.py b/lib/drawdxf.py
index 08931a4..32bbf53 100644
--- a/lib/drawdxf.py
+++ b/lib/drawdxf.py
@@ -137,7 +137,7 @@ def write_excel_from_json(plines:Polylines, outpath:str):
 
     for pl in plines.kabel:
         length = pl.length /1000                # Umrechnung von mm in m
-        rounded_len = math.ceil(length/10)*10
+        rounded_len = math.ceil(length/5)*5
         length_summary[rounded_len] +=1
         ws1.append([pl.id, length, int(rounded_len)])