How to calculate your personal calorie deficit Pretty simple using the TDEE calculator and doing some easy math, but if you still feel confused or want more help with doing a calorie deficit I can help! Doing a calorie deficit can be hard and confusing at first! Especially if you don’t know how to track your intake and what not I used MyFitnessPal to track mine! If you need more help though, my next group weight lose challenge (women only) starts on Monday and it comes with my guide! Basically,