Wouldn't the calorie intake vary from hamster to hamster, depending on their size, sex, age, and condition (and type)? I don't know the right answer, but based on this complete high quality high-energy lab diet by Purina Lab Diet (ProLab RMH3000 formula) that's highly recommended in the U.S. by professional breeders,
http://www.labdiet.com/pdf/5p00.pdf
I can estimate the following:
It says "adult hamsters will eat up to 14g a day", and the gross energy value is 4.10kcal/g, physiological fuel value is 3.46kcal/g, and metabolizable energy is 3.2kcal/g. I'm not sure how those values compare to normal human foods, but taking the average, we get 3.59kcal/g. I
think human food is counted by gross energy value. Anyway, it means that an adult hamster (syrian) will eat up to 50.2kcal / day average and 57.4kcal/day (gross energy value from food). That means less for dwarf hamsters and smaller syrians.
Hope my analysis is not too far off! You can see other nutritional value comparisons in that PDF file of nutritional information.
P.S.: this is for a fit lab animal--chubby lazy hamsters at home probably consume a bit more.