What is my activity level?

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Hi, my name is Libby and I am here to maintain a hard-earned healthy lifestyle after losing 40 pounds thanks to this website!

I have been on different sites and they all seem to tell me that 2000 calories is effiicient for my activity level (moderately active/active) however this tells me to eat 1860.

I don't know whether this is unaccurate, or the definition of active on this website is different to others.

Basically I walk around 3 miles every day, and 3 times a week I do 45 min aerobic exercise. During the day, I would say I am on my feet half of the time.

What do you think my activity level is, and how many calories do you think I should have?

(I am 15, 112lb and 5'3)