diff --git a/app/comp/moy_sem.py b/app/comp/moy_sem.py
new file mode 100644
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+++ b/app/comp/moy_sem.py
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+# -*- mode: python -*-
+# -*- coding: utf-8 -*-
+
+##############################################################################
+#
+# Gestion scolarite IUT
+#
+# Copyright (c) 1999 - 2021 Emmanuel Viennet.  All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+#   Emmanuel Viennet      emmanuel.viennet@viennet.net
+#
+##############################################################################
+
+"""Fonctions de calcul des moyennes de semestre (indicatives dans le BUT)
+"""
+import numpy as np
+import pandas as pd
+
+
+def compute_sem_moys(etud_moy_ue_df, modimpl_coefs_df):
+    """Calcule la moyenne générale indicative
+    = moyenne des moyennes d'UE, pondérée par la somme de leurs coefs
+
+    etud_moy_ue_df: DataFrame, colonnes ue_id, lignes etudid
+    modimpl_coefs_df: DataFrame, colonnes moduleimpl_id, lignes UE
+
+    Result: panda Series, index etudid, valeur float (moyenne générale)
+    """
+    moy_gen = (etud_moy_ue_df * modimpl_coefs_df.values.sum(axis=1)).sum(
+        axis=1
+    ) / modimpl_coefs_df.values.sum()
+    return moy_gen