diff --git a/addons/sale_product_configurator/controllers/main.py b/addons/sale_product_configurator/controllers/main.py
index 541246ba703..edb0c2be7f5 100644
--- a/addons/sale_product_configurator/controllers/main.py
+++ b/addons/sale_product_configurator/controllers/main.py
@@ -8,7 +8,7 @@ from odoo.http import request
 class ProductConfiguratorController(http.Controller):
     @http.route(['/sale_product_configurator/configure'], type='json', auth="user", methods=['POST'])
     def configure(self, product_template_id, pricelist_id, **kw):
-        add_qty = int(kw.get('add_qty', 1))
+        add_qty = float(kw.get('add_qty', 1))
         product_template = request.env['product.template'].browse(int(product_template_id))
         pricelist = self._get_pricelist(pricelist_id)
 
@@ -39,7 +39,7 @@ class ProductConfiguratorController(http.Controller):
         return self._optional_product_items(product_id, pricelist, **kw)
 
     def _optional_product_items(self, product_id, pricelist, **kw):
-        add_qty = int(kw.get('add_qty', 1))
+        add_qty = float(kw.get('add_qty', 1))
         product = request.env['product.product'].browse(int(product_id))
 
         parent_combination = product.product_template_attribute_value_ids
@@ -59,7 +59,7 @@ class ProductConfiguratorController(http.Controller):
     def _show_advanced_configurator(self, product_id, variant_values, pricelist, handle_stock, **kw):
         product = request.env['product.product'].browse(int(product_id))
         combination = request.env['product.template.attribute.value'].browse(variant_values)
-        add_qty = int(kw.get('add_qty', 1))
+        add_qty = float(kw.get('add_qty', 1))
 
         no_variant_attribute_values = combination.filtered(
             lambda product_template_attribute_value: product_template_attribute_value.attribute_id.create_variant == 'no_variant'
diff --git a/addons/sale_product_configurator/static/src/js/product_configurator_controller.js b/addons/sale_product_configurator/static/src/js/product_configurator_controller.js
index 825aebc630f..6d7448f0e6b 100644
--- a/addons/sale_product_configurator/static/src/js/product_configurator_controller.js
+++ b/addons/sale_product_configurator/static/src/js/product_configurator_controller.js
@@ -118,12 +118,13 @@ var ProductConfiguratorFormController = FormController.extend({
         var initialProduct = this.initialState.data.product_template_id;
         var changed = initialProduct && initialProduct.data.id !== productTemplateId;
         var data = this.renderer.state.data;
+        var quantity = initialProduct.context && initialProduct.context.default_quantity ? initialProduct.context.default_quantity : data.quantity;
         return this._rpc({
             route: '/sale_product_configurator/configure',
             params: {
                 product_template_id: productTemplateId,
                 pricelist_id: this.renderer.pricelistId,
-                add_qty: data.quantity,
+                add_qty: quantity,
                 product_template_attribute_value_ids: changed ? [] : this._getAttributeValueIds(
                     data.product_template_attribute_value_ids
                 ),
diff --git a/addons/sale_product_configurator/static/src/js/product_configurator_modal.js b/addons/sale_product_configurator/static/src/js/product_configurator_modal.js
index f9bdb5e7e0c..b6dbb6037be 100644
--- a/addons/sale_product_configurator/static/src/js/product_configurator_modal.js
+++ b/addons/sale_product_configurator/static/src/js/product_configurator_modal.js
@@ -185,7 +185,7 @@ var OptionalProductsModal = Dialog.extend(ServicesMixin, VariantMixin, {
         let noVariantAttributeValues;
         for (const product of self.$modal.find('.js_product.in_cart')) {
             var $item = $(product);
-            var quantity = parseInt($item.find('input[name="add_qty"]').val(), 10);
+            var quantity = parseFloat($item.find('input[name="add_qty"]').val().replace(',', '.') || 1);
             var parentUniqueId = product.dataset.parentUniqueId;
             var uniqueId = product.dataset.uniqueId;
             productCustomVariantValues = self.getCustomVariantValues($item);
@@ -488,7 +488,7 @@ var OptionalProductsModal = Dialog.extend(ServicesMixin, VariantMixin, {
         if (this.$modal.find('.js_price_total').length) {
             var price = 0;
             this.$modal.find('.js_product.in_cart').each(function () {
-                var quantity = parseInt($(this).find('input[name="add_qty"]').first().val(), 10);
+                var quantity = parseFloat($(this).find('input[name="add_qty"]').first().val().replace(',', '.') || 1);
                 price += parseFloat($(this).find('.js_raw_price').html()) * quantity;
             });