I've calculated my BMR, and all RMR etc. My problem is knowing if it's really accurate or not, because I seem do get different amounts from different calculations from different sites. Also how do I account for the activity I do in a day. I'll be working out low volume high intensity on my weight training 4 days a week, and doing 2-3 HIIT cardio sessions a week. I need my BMR plus the calories that I'll be burning doing my exercise and then back that off by an amount that will ensure a caloric defecit (spell). Please help me.