diff --git a/util/estimateGrade.py b/util/estimateGrade.py
new file mode 100644
index 0000000..cf1213f
--- /dev/null
+++ b/util/estimateGrade.py
@@ -0,0 +1,26 @@
+#! python
+import json
+
+# Get students
+try:
+  with open("../output/students.json") as studentFile: students = json.load(studentFile)
+except FileNotFoundError:
+  with open("./output/students.json") as studentFile: students = json.load(studentFile)
+
+flex = ("XAT--12A-S", "XAT--12B-S")
+
+most_frequent = lambda l : max(set(l), key = l.count)
+
+def getEstimatedGrade(pupil: dict) -> int:
+  grades = [] # List of all possible grades
+  for request in pupil["requests"]:
+    if request["CrsNo"] in flex: continue
+    for extractedGrade in [int(s) for s in request["CrsNo"].split("-") if s.isdigit()]:
+      grades.append(extractedGrade)
+
+  return None if len(grades) == 0 else most_frequent(grades) # Final estimate of grade
+
+if __name__ == '__main__':
+  # Define students grade level
+  for student in students:
+    student["gradelevel"] = getEstimatedGrade(student)