They are 31 calories and 0.1 grams fat according to this site....
Oh darn, I can't post links yet. I just hate that. Anyhow, just google "calories tangerine" and some good sites will come up. I trust "thecaloriecounter" That is where I got the 31 cals from
That is for a 70g tangerine, weighed with the skin on I imagine. Do you have a food scale? They are great for making sure you are calculating the right portion
I hope that helps