diff --git a/myproject/orders/migrations/0004_change_orderitem_quantity_to_decimal.py b/myproject/orders/migrations/0004_change_orderitem_quantity_to_decimal.py
new file mode 100644
index 0000000..8cd8664
--- /dev/null
+++ b/myproject/orders/migrations/0004_change_orderitem_quantity_to_decimal.py
@@ -0,0 +1,23 @@
+# Generated by Django 5.0.10 on 2026-01-02 14:55
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orders', '0003_add_sales_unit_fields'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='historicalorderitem',
+            name='quantity',
+            field=models.DecimalField(decimal_places=3, default=1, help_text='Количество в единицах продажи (может быть дробным)', max_digits=10, verbose_name='Количество'),
+        ),
+        migrations.AlterField(
+            model_name='orderitem',
+            name='quantity',
+            field=models.DecimalField(decimal_places=3, default=1, help_text='Количество в единицах продажи (может быть дробным)', max_digits=10, verbose_name='Количество'),
+        ),
+    ]
diff --git a/myproject/orders/models/order_item.py b/myproject/orders/models/order_item.py
index ef74f7e..7b7e481 100644
--- a/myproject/orders/models/order_item.py
+++ b/myproject/orders/models/order_item.py
@@ -62,9 +62,12 @@ class OrderItem(models.Model):
         verbose_name="Артикул на момент заказа"
     )
 
-    quantity = models.PositiveIntegerField(
+    quantity = models.DecimalField(
+        max_digits=10,
+        decimal_places=3,
         default=1,
-        verbose_name="Количество"
+        verbose_name="Количество",
+        help_text="Количество в единицах продажи (может быть дробным)"
     )
 
     price = models.DecimalField(