Last Updated : 12 Jul, 2025
DecimalField is a field which stores a fixed-precision decimal number, represented in Python by a Decimal instance. It validates the input using DecimalValidator
Syntaxfield_name = models.DecimalField(max_digits=None, decimal_places=None, **options)
Parameters:
Note: max_digits must be greater than or equal to decimal_places.
Example Usage:
To store numbers up to 999 with a resolution of 2 decimal places:
models.DecimalField(..., max_digits=5, decimal_places=2)
And to store numbers up to approximately one billion with a resolution of 10 decimal places:
Django Model DecimalFieldmodels.DecimalField(..., max_digits=19, decimal_places=10)
Illustration of DecimalField using an Example. Consider a project named geeksforgeeks having an app named geeks
Refer to the following articles to check how to create a project and an app in Django.
Enter the following code into models.py file of geeks app.
Python
from django.db import models
from django.db.models import Model
# Create your models here.
class GeeksModel(Model):
geeks_field = models.DecimalField(
max_digits = 5,
decimal_places = 2
)
Adding the App to INSTALLED_APPS:
Make sure to add the geeks app to your project's INSTALLED_APPS in settings.py:
Python
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'geeks', # Add this line
]
Migrations
To create the database schema for your model, run the following commands:
1. Create migrations:
python manage.py makemigrations
2. Apply migrations:
python manage.py migrate
This will create the GeeksModel and add a geeks_field DecimalField to the database.
How to use DecimalFieldDecimalField is used for storing decimal numbers (e.g., monetary values, precise measurements) in the database.
Here’s how you can store a decimal number in the GeeksModel:
Python
# importing the model from geeks app
from geeks.models import GeeksModel
# importing the decimal module
import decimal
# creating a Decimal instance
d = decimal.Decimal(9.53)
# creating an instance of GeeksModel and saving it
geek_object = GeeksModel.objects.create(geeks_field=d)
geek_object.save()
Now, this decimal value 9.53 will be stored in the database in the geeks_field column and we can check it in admin server.
Field OptionsField Options are the arguments given to each field for applying some constraint or imparting a particular characteristic to a particular Field. For example, adding an argument null = True to DecimalField will enable it to store empty values for that table in relational database. Here are the field options and attributes that a DecimalField can use.
Field Options Description Null If True, Django will store empty values as NULL in the database. Default is False. Blank If True, the field is allowed to be blank. Default is False. db_column The name of the database column to use for this field. If this isn’t given, Django will use the field’s name. Default The default value for the field. This can be a value or a callable object. If callable it will be called every time a new object is created. help_text Extra “help” text to be displayed with the form widget. It’s useful for documentation even if your field isn’t used on a form. primary_key If True, this field is the primary key for the model. editable If False, the field will not be displayed in the admin or any other ModelForm. They are also skipped during model validation. Default is True. error_messages The error_messages argument lets you override the default messages that the field will raise. Pass in a dictionary with keys matching the error messages you want to override. help_text Extra “help” text to be displayed with the form widget. It’s useful for documentation even if your field isn’t used on a form. verbose_name A human-readable name for the field. If the verbose name isn’t given, Django will automatically create it using the field’s attribute name, converting underscores to spaces. validators A list of validators to run for this field. See the validators documentation for more information. Unique If True, this field must be unique throughout the table.RetroSearch is an open source project built by @garambo | Open a GitHub Issue
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