Need help understand calorie limit.

I am so lost trying to figure out the amount of calories I should be eating in order to lose. I get from 1200 to 1700 depending on whether I use the BMR or the guided thingy. Can someone help me understand? I am a 36 year old female. Don't really exercise alot. Trying to walk at least 4-5 times a week. I started out weighing 205 and currently weigh 195. Don't want to hamper my weight loss but don't want to starve either. Can someone help with what amount of calories I should be aiming for?

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