So you are eating this meal...
Turkey sub sandwich, 75 carbs
Half an odwalla juice drink (16 oz bottle), 35 carbs
Baked potato chips, 26 carbs
Total carbs, 136; total bolus, ~9 units Novolog
...I know this will differ between pump and syringe users, but how exactly do you bolus/inject? I'd give myself 6 units before starting to eat and then, depending on how much of the sandwich and chips I actually eat, I'll add a few more units. If I eat everything I'd give myself 9 units based on my 1:15 insulin to carb ratio. But, if I only eat half of the sandwich I'll probably only give myself about 6.5-7 units.
Does anyone else do this? Two sets of boluses based on how much you think you'll eat and how much you actually eat? I guess that's what I like most about my pump. And to what lengths do you go to ensure your calculations are correct? Do you just use mental math or do you sometimes just do a "ballpark guess" based on how much carbs you think you're eating?