I have never based what I eat on calories since going low carb. By setting my carbs at 20 net and my protein much higher than most people suggest the amount of fat I eat seems to fall into place. Those calculators just mess me up so I don't use them.

For example today I will eat:
Carbs: 20 gms net
Protein: 111 gms
Fat: 121 gms
Calories: 1650

Works for me.