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You can for instance do this:
calculations_list = Calculations.objects.filter(user=request.user) \
.values_list('make', 'model', 'first_registration', 'body', 'facelift',
'engine', 'transmission', 'mileage',
'customer__firstname', 'customer__lastname', 'customer__email') \
.annotate(purchase_price=F('purchase_price')*1.21)
.order_by('-id')
Source:stackexchange.com