diff --git a/abl/abducer/kb.py b/abl/abducer/kb.py
index 4178c4e..0cff3fa 100644
--- a/abl/abducer/kb.py
+++ b/abl/abducer/kb.py
@@ -378,7 +378,7 @@ class HWF_KB(RegKB):
             'div': '/',
         }
         formula = [mapping[f] for f in formula]
-        return round(eval(''.join(formula)), 2)
+        return eval(''.join(formula))
 
 
 import time