diff --git a/kfet/static/kfet/css/kpsul.css b/kfet/static/kfet/css/kpsul.css
index 1616ce3e..166ef5f5 100644
--- a/kfet/static/kfet/css/kpsul.css
+++ b/kfet/static/kfet/css/kpsul.css
@@ -112,6 +112,14 @@ input[type=number]::-webkit-outer-spin-button {
     right:0;
 }
 
+#account #alcohol-warning {
+    padding: 5px;
+    position: absolute;
+    top:0;
+    right:0;
+    font-size:35px;
+}
+
 @media (min-width: 600px) {
     #account_form input { font-size:60px; }
 
diff --git a/kfet/static/kfet/js/account.js b/kfet/static/kfet/js/account.js
index 5ce3c8cd..cf1e06dc 100644
--- a/kfet/static/kfet/js/account.js
+++ b/kfet/static/kfet/js/account.js
@@ -11,6 +11,7 @@ var Account = Backbone.Model.extend({
         'departement': '',
         'nickname': '',
         'trigramme': '',
+        'n_units': 0,
     },
 
     url: function () {
@@ -45,6 +46,7 @@ var AccountView = Backbone.View.extend({
     el: '#account',
     input: '#id_trigramme',
     buttons: '.buttons',
+    alcohol_warning: '#alcohol-warning',
 
     props: _.keys(Account.prototype.defaults),
 
@@ -98,6 +100,15 @@ var AccountView = Backbone.View.extend({
         return buttons
     },
 
+    get_alcohol_warning: function () {
+        n_units = parseFloat(this.model.get("n_units")).toFixed(2);
+
+        if (n_units < 4)
+            return "";
+
+        return `<i class="fa fa-beer" title="${n_units} unités"></i>`
+    },
+
     render: function () {
         for (let prop of this.props) {
             var selector = "#account-" + prop;
@@ -106,6 +117,7 @@ var AccountView = Backbone.View.extend({
 
         this.$el.attr("data-balance", this.attr_data_balance());
         this.$(this.buttons).html(this.get_buttons());
+        this.$(this.alcohol_warning).html(this.get_alcohol_warning());
     },
 
     reset: function () {
@@ -124,6 +136,10 @@ var LIQView = AccountView.extend({
         return "";
     },
 
+    get_alcohol_warning: function () {
+        return ""
+    },
+
     attr_data_balance: function () {
         return 'ok';
     }
diff --git a/kfet/templates/kfet/base.html b/kfet/templates/kfet/base.html
index 9b75af03..40b3b51b 100644
--- a/kfet/templates/kfet/base.html
+++ b/kfet/templates/kfet/base.html
@@ -17,6 +17,7 @@
     <link rel="stylesheet" type="text/css" href="{% static 'vendor/jquery/jquery-ui.min.css' %}">
     <link rel="stylesheet" type="text/css" href="{% static 'kfet/vendor/jquery/jquery-confirm.min.css' %}">
     <link rel="stylesheet" type="text/css" href="{% static 'kfet/css/index.css' %}">
+    <link type="text/css" rel="stylesheet" href="{% static 'gestioncof/vendor/font-awesome/css/font-awesome.min.css' %}">
 
     {# JS #}
     <script type="text/javascript" src="{% static 'kfet/vendor/js.cookie.js' %}"></script>
diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index 7b292087..5660e70b 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -86,6 +86,7 @@
           <span id="account-promo"></span>
         </div>
         <div id="account-email" class="data_line"></div>
+        <div id="alcohol-warning"></div>
         <div class="buttons">
         </div>
       </div>
diff --git a/kfet/views.py b/kfet/views.py
index b6c49f72..602f800e 100644
--- a/kfet/views.py
+++ b/kfet/views.py
@@ -2,7 +2,7 @@ import ast
 import heapq
 import statistics
 from collections import defaultdict
-from datetime import timedelta
+from datetime import datetime, time, timedelta
 from decimal import Decimal
 from typing import List
 from urllib.parse import urlencode
@@ -916,6 +916,29 @@ def account_read_json(request, trigramme):
     account = get_object_or_404(Account, trigramme=trigramme)
     if not account.readable:
         raise Http404
+
+    # Calcul des unités d'alcool consommées
+    # 1UA = 10g d'alcool (éthanol) pur
+    alcohol_density = 0.8
+    now = timezone.localtime(timezone.now())
+    # une soirée va de XXh à 06h
+    if time(18) <= now.time() or now.time() <= time(6):
+        begin_time = datetime.combine(now.date(), time(18))
+        # si on est après minuit, il faut retrancher un jour
+        if now.time() <= time(6):
+            begin_time -= timedelta(days=1)
+
+        qs = Operation.objects.filter(
+            group__on_acc=account, type=Operation.PURCHASE, group__at__gte=begin_time,
+        ).annotate(
+            units=F("article__volume") * F("article__abv") * alcohol_density / 100
+        )
+        # Sum retourne None sur un queryset vide :
+        # https://docs.djangoproject.com/en/3.0/ref/models/querysets/#aggregation-functions
+        n_units = qs.aggregate(agg=Sum("units"))["agg"] or 0
+    else:
+        n_units = 0
+
     data = {
         "id": account.pk,
         "name": account.name,
@@ -927,6 +950,7 @@ def account_read_json(request, trigramme):
         "departement": account.departement,
         "nickname": account.nickname,
         "trigramme": account.trigramme,
+        "n_units": n_units,
     }
     return JsonResponse(data)