diff --git a/addons/spreadsheet/models/res_lang.py b/addons/spreadsheet/models/res_lang.py
index 57143a5550d..6d4ae813de4 100644
--- a/addons/spreadsheet/models/res_lang.py
+++ b/addons/spreadsheet/models/res_lang.py
@@ -19,6 +19,12 @@ class Lang(models.Model):
         spreadsheet_locales = [lang._odoo_lang_to_spreadsheet_locale() for lang in langs]
         return spreadsheet_locales
 
+    @api.model
+    def get_user_spreadsheet_locale(self):
+        """Convert the odoo lang to a spreadsheet locale."""
+        lang = self._lang_get(self.env.user.lang)
+        return lang._odoo_lang_to_spreadsheet_locale()
+
     def _odoo_lang_to_spreadsheet_locale(self):
         """Convert an odoo lang to a spreadsheet locale."""
         return {
diff --git a/addons/spreadsheet/static/tests/utils/mock_server.js b/addons/spreadsheet/static/tests/utils/mock_server.js
index 6a2de0342be..4d6d1a4cc71 100644
--- a/addons/spreadsheet/static/tests/utils/mock_server.js
+++ b/addons/spreadsheet/static/tests/utils/mock_server.js
@@ -1,13 +1,14 @@
 /** @odoo-module */
 
 import { registry } from "@web/core/registry";
+import { constants } from "@odoo/o-spreadsheet";
 
 registry
     .category("mock_server")
     .add("res.currency/get_currencies_for_spreadsheet", function (route, args) {
         const currencyNames = args.args[0];
         const result = [];
-        for (let currencyName of currencyNames) {
+        for (const currencyName of currencyNames) {
             const curr = this.models["res.currency"].records.find(
                 (curr) => curr.name === currencyName
             );
@@ -28,4 +29,7 @@ registry
             position: "after",
             decimalPlaces: 2,
         };
+    })
+    .add("res.lang/get_user_spreadsheet_locale", function (route, args) {
+        return constants.DEFAULT_LOCALE;
     });