It would only be like 1/2 teaspoon I was using and yes I do have a smartphone, I've used my fitness pal on the laptop but it sometimes gives out the wrong information I've noticed, I didn't know you could scan the stuff though, I will give it a go when I get internet back on my phone next month as had updates to do that ate about half of my data haha, only got it the other weekend as well xThey may but if you are using a tiny amount eg the amount to flavour a cake, I wouldn't worry. Have you got a phone that downloads apps? If yes I would suggest downloading MyFitnessPal it has the carbs for almost everything and you can scan items into it to check the nutritional value, including carbs.
I used to be bad for adding it to a cup of milk haha, god how I miss a cup of crusha etc haha xUnless you're drinking a whole bottle you don't need to worry about the carb content. And if you're drinking a whole bottle there's definitely more to worry about than a few carbs😛