Calorie goal setting

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Q: I have a scale that calculates DCI. Daily Caloric Intake. My understanding is that this is the cal needed to maintain. To lose 2 lbs a week cut that by 1k cal. MyFittness Pal suggests 1200 cal minimum and warns you if you go under. The math then looks like this. DCI (1825) - 1000 (to lose 2 lbs / wk) = Daily goal (825). Consume 1200 to get to minimum for My Fitness Pal to let you "complete" a day. To get back to 825 do 375 cal of exercise. On the app it looks like 825 - 1200 - 375 = 0. Am I looking at this correctly? 825 seems low and when I use the "guided" goals in the app it sets my daily goal at 1500. If it helps I'm 47 M 167 trying to get what I believe is BMI normal ~ 155 lbs. I've on a day 190 on the app and so far have lost 38 lbs. I've cheated ~ 8 times in that timeframe. I workout daily and am looking to do my first sprint triathlon in over 10 years. Side note... why can I only select "tech support questions"?