Help calculating BMR...

OK so I'm still very confused about this whole thing.

I'm 29 (nearly 30); 5'1; 140 lbs.

I work about 30 hours a week at a job where I'm on my feet all day, and about 15-20 hours a week a desk job.

I work out 3x a week with a personal trainer burning anywhere from 200-450 calories a session. I do a long run 2-4 times a week, at least 14K burning over 1000 calories.

I said I was light activity. Which means I burn 1785 a day BMR and I still record my workouts with my trainer and my long runs.

Is this correct? 

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