diff --git a/common/fields.py b/common/fields.py
new file mode 100644
index 0000000..04a2e7b
--- /dev/null
+++ b/common/fields.py
@@ -0,0 +1,5 @@
+from django.db import models
+from django.core.validators import MinValueValidator, MaxValueValidator
+
+class PercentageField(models.FloatField):
+    default_validators = [MaxValueValidator(100), MinValueValidator(0)]
\ No newline at end of file