Maximum amount of calories in a giant chocolate chip cookie?

I just ate a huge cookie from my school's cafeteria. It was bigger than my hand, almost the size of a kid's face

I'm going out with my friends after school, so I'm going to be eating more food. I want to get an estimate of how many calories I've had before I go.

how many calories should I count it as?

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seem to be gaining on not a very large amount of food...help??!!

I'm not sure if it's just me, but from reading what other people seem to eat, in comparison, mine seems to be less, but yet i'm still gaining? I know it differs from person to person, but still.....if they say you need 2000-3000 to gain, at most i'm only getting like 1800???

here's today, anyway:

B: 30g granola with alpro almond milk, 250ml orange juice and 1 piece of brown toast with bertolli

S: Strawberries

L: 6 pieces of fish sushi, salad, orange, 125g fruit yogurt pot

S: McDonald's small fries + ketchup

D: 80g roasted pork, 3 pre-made roast potatoes, at least 3 cups of steamed mixed veg ( I like veg (: broccoli, cauliflower, carrots, etc) and a petit filous yogurt

S: Options instant hot chocolate, frozen berries and 100g l/f natural yogurt

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