Django: Calculate the Sum of the column values through query

You're probably looking for aggregate

from django.db.models import Sum

ItemPrice.objects.aggregate(Sum('price'))
# returns {'price__sum': 1000} for example

Annotate adds a field to results:

>> Order.objects.annotate(total_price=Sum('price'))
<QuerySet [<Order: L-555>, <Order: L-222>]>

>> orders.first().total_price
Decimal('340.00')

Aggregate returns a dict with asked result:

>> Order.objects.aggregate(total_price=Sum('price'))
{'total_price': Decimal('1260.00')}

Use .aggregate(Sum('column'))['column__sum'] reefer my example below

sum = Sale.objects.filter(type='Flour').aggregate(Sum('column'))['column__sum']

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