How many calories?

Hi, I am not sure how many calories I should be taking everyday. I am 5'6" and 227 lbs. I am nursing a 16 month toddler, and taking care of his older brother and other household activities. Currently I haven't started excersing yet. I have set the weight loss to 2 lbs a week but I find the 1200 calories a bit harsh.
I would appreciate any help calculating. Thanks

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