diff --git a/cloudkitty/rating/hash/db/sqlalchemy/alembic/versions/4e0232ce_increase_precision_for_cost_fields.py b/cloudkitty/rating/hash/db/sqlalchemy/alembic/versions/4e0232ce_increase_precision_for_cost_fields.py
new file mode 100644
index 00000000..5b439a53
--- /dev/null
+++ b/cloudkitty/rating/hash/db/sqlalchemy/alembic/versions/4e0232ce_increase_precision_for_cost_fields.py
@@ -0,0 +1,45 @@
+# Copyright 2018 OpenStack Foundation
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
+"""Increase cost fields to 30 digits
+
+Revision ID: 4e0232ce
+Revises: Ifbf5b2515c7
+Create Date: 2022-04-06 08:00:00.000000
+
+"""
+
+from alembic import op
+import importlib
+
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '4e0232ce'
+down_revision = 'Ifbf5b2515c7'
+
+
+def upgrade():
+    down_version_module = importlib.import_module(
+        "cloudkitty.rating.hash.db.sqlalchemy.alembic.versions."
+        "644faa4491fd_update_tenant_id_type_from_uuid_to_text")
+
+    for table_name in ('hashmap_mappings', 'hashmap_thresholds'):
+        with op.batch_alter_table(
+                table_name, reflect_args=down_version_module.get_reflect(
+                    table_name)) as batch_op:
+
+            batch_op.alter_column('cost',
+                                  type_=sa.Numeric(precision=40, scale=28))
diff --git a/cloudkitty/rating/hash/db/sqlalchemy/models.py b/cloudkitty/rating/hash/db/sqlalchemy/models.py
index 3695a540..e16d5b27 100644
--- a/cloudkitty/rating/hash/db/sqlalchemy/models.py
+++ b/cloudkitty/rating/hash/db/sqlalchemy/models.py
@@ -230,7 +230,7 @@ class HashMapMapping(Base, HashMapBase):
         sqlalchemy.String(255),
         nullable=True)
     cost = sqlalchemy.Column(
-        sqlalchemy.Numeric(30, 28),
+        sqlalchemy.Numeric(40, 28),
         nullable=False)
     map_type = sqlalchemy.Column(
         sqlalchemy.Enum(
@@ -309,7 +309,7 @@ class HashMapThreshold(Base, HashMapBase):
         sqlalchemy.Numeric(20, 8),
         nullable=True)
     cost = sqlalchemy.Column(
-        sqlalchemy.Numeric(30, 28),
+        sqlalchemy.Numeric(40, 28),
         nullable=False)
     map_type = sqlalchemy.Column(
         sqlalchemy.Enum(
diff --git a/doc/source/user/rating/hashmap.rst b/doc/source/user/rating/hashmap.rst
index efc28ba1..80f8f822 100644
--- a/doc/source/user/rating/hashmap.rst
+++ b/doc/source/user/rating/hashmap.rst
@@ -160,8 +160,8 @@ As for mappings, a threshold can be tied to a specific scope/project.
 Cost
 ----
 The cost option is the actual cost for the rating period. It has a precision of
-28 decimal digits (on the right side of the number), and 30 digits on the left
-side of the number.
+28 decimal digits (on the right side of the decimal point), and 12 digits on
+the left side of the decimal point (the integer part of the number).
 
 Examples
 ========
diff --git a/releasenotes/notes/fix-rating-rules-value-precision-40d1054f8ab494c3.yaml b/releasenotes/notes/fix-rating-rules-value-precision-40d1054f8ab494c3.yaml
new file mode 100644
index 00000000..2eef9bf8
--- /dev/null
+++ b/releasenotes/notes/fix-rating-rules-value-precision-40d1054f8ab494c3.yaml
@@ -0,0 +1,10 @@
+---
+fixes:
+  - |
+    Allow rating rules that have more than 2 digits in integer part.
+
+    Currently, CloudKitty only allows creating rating rules as
+    ``99.999999999999999999999999``. Therefore, for prices equal to or higher
+    than 100, we would not be able to use them. This patch will enable
+    operators to use any value between ``0`` and ``999999999999`` (in the
+    integer part of the number), which will provide more flexibility.