connorcream, 
you can go here and check out nutritional value of starbucks drinks with your variation.  
http://www.starbucks.com/retail/nutrition_beverages.asp
I look at the grams of sugar rather than calories to evaluate whether a drink is suitable for N days. 
For me I was drinking chai tea lattes on S and NWS days as treat.  I drank them with soymilk.  A grande chai tea latte with soymilk has 41 grams of sugar.  1 teaspoon of sugar is about 4 grams.  So you can see that 41 grams is equivalent to more than TEN teaspoons of sugar. 
For me, that would be really pushing it for an N day drink, i.e. this is why I only drank them on S/NWS days.
In September I went back to drinking coffee. I had quit for four years.  Using Reinhard's "glass ceiling" concept I am able to effectively limit myself to two cups  a day and this is working well for me.
During the week I drink two tall cafe mistos, one after breakfast and one after lunch.  Each one, including soymilk has 7 grams of sugar.  This is LESS THAN 2 teaspoons.  Also it doesn't have a "sweety" taste.  I qualify that for N Days.  On S/NWS days I am drinking Caramel Macchiatos which have a little bet less sugar than the Chai Tea Lattes ... a grande has 32 grams of sugar with soymilk ... about 8 teaspoons of sugar. DEFINITELY A TREAT 
 
 
anyway, this is how i evaluate my starbucks drinks, and obviously I am shamelessly ADDICTED ... but I do ENJOY them so ... my cafe mistos and caramel macchiatos and I was really enjoying those chai tea lattes before I went back to coffee, 
oh also just want to note I don't ever add any additional sweetners to my Starbucks drinks, 
sorry so long, 
Blueskighs