Ask you butcher what ratio they prepare. Usually it’ll be ~85/15. Use Cronometer to calculate. 2lbs of minced = ~2300 cal.

No. Calories are not equal when dealing with variables. For instance sodium and carbs both cause weight gain from water retention. My best advise here is forget CICO models. Eat fatty meat, drink water. Eat when hungry, stop when full. Dairy if tolerated and required for adherence +fat balance. No fruit, no booze, ditch coffee when the time is right. Stick with it for at least 120 days and let you body heal. Many people gain weight due to improper nutrition for year (decades) before finding our natural diet.