Welcome to FitDay and the forums!
Currently, there is no facility to do that automatically. With the FitDay Premium you can track custom info, but you'd still have to do the math. We've been told that tracking net carbs may be added sometime in the future (but I wouldn't hold my breath).
Regards,
Michael
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47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans) 
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12) Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.
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