diff --git a/calculator.py b/calculator.py
index b12986aa7e6..b0ef5dca8dd 100644
--- a/calculator.py
+++ b/calculator.py
@@ -37,6 +37,9 @@ def calc(term):
     purpose: This function is the actual calculator and the heart of the application
     """
 
+    # This part is for reading and converting function expressions.
+    term = term.lower()
+
     # This part is for reading and converting arithmetic terms.
     term = term.replace(" ", "")
     term = term.replace("^", "**")
@@ -61,9 +64,6 @@ def calc(term):
         "e",
     ]
 
-    # This part is for reading and converting function expressions.
-    term = term.lower()
-
     for func in functions:
         if func in term:
             withmath = "math." + func