BMR rate and calories

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Hi all

All this BMR and calorie stuff is confusing! Im new to this and need some advice please.....I have 63lbs to lose with a time frame of 9 months hopefully....Ive calculated my BMR to be 1720 and Im currently doing 1200 cals a day but Im always at least 400 under each day after I calculate exercise.
I need to know if 1200 is too little calories?

All very confusing, so any advice is greatly appreciated thank you :-)

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