How many calories does a home-made marinade add?
Oil which ends up being eaten, no matter if it comes from deep frying, marinating or just adding it, clocks in at 7-9 calories per gram of oil. If you add any sugar or thick syrup, calculate around 4 calories per gram. Tabasco sauce, being mostly vegetables and vinegar, is truly trivial in calories. 

If you weigh the oil (and sugar if using) going into your marinade, and also weigh all your finished marinade, you can roughly calculate the calories per g of finished marinade: (("grams oil"*8)+("grams sugar"*4))/"total weight". 

Now divide the total weight of marinade (minus the weight of marinade wasted -weigh it!) by the number of portions, and multiply with the calories per gram factor you calculated above.

Chances are that oil will penetrate less than other marinade ingredients, which could end up with there being a bit less calories in the finished food than calculated.