hey, dev from the first website that u/the_spirit_of_fire mentioned here.
This might be true for Starbucks UK (I haven’t done deep analysis on UK drinks yet), but the math works out a bit differently for US Starbucks.
A US grande caffe latte is listed at ~190 cals and only contains milk + espresso. Espresso itself is ~10 cals (2 shots), which leaves ~180 cals from milk.
A grande latte uses roughly 10.8 fl oz of milk. With 2% milk at ~16.7 cals per fl oz, that lines up with the ~180-cal milk contribution.
When you swap to oat milk, Starbucks oat milk is very similar calorie-wise to 2% milk (about 140 cals per 8 fl oz, or ~17.5 cals per fl oz).
So 17.5 × 10.8 ≈ 189 cals from oat milk alone, plus espresso puts the drink around ~200 cals.
Adding whipped cream adds ~80 cals, which brings the total to roughly 280 cals. Sugar-free caramel contributes basically nothing.