I have seen a few disney Princess Threads talking about the heights of the disney princesses. I am going to give my opinion based on myself and facts.

Tall;
Esmeralda: She's not an official princess, but yes, she is the tallest. It has been confirmed.
Pocahontas; She's almost the height as John Smith, who was a tall man. She was always drawn with really long legs.
Elsa: She is Norwegian, the oldest, and has always just seem tall to me, even when she was younger.
Megara; Meg has the segundo tallest boyfriend, and is around his neck. I'm going to count it.

Medium;

Aurora; Though they say she is the tallest, she just looks petite to me. I'll put her here anyway.
Anna; Anna is much shorter than her sister, but hey, she's still a Norwegian.
Cinderella; She's about even with me.
Tiana; Just seems taller than some of the others. Taller than Charlotte.
Merida; Merida has always seemed shortish/average, maybe she is short, but then again, she has two parents around 6 feet.
Belle; Almost short, but she's compared to a beast. Then again, she has a ridiculously short father.

Short:
Mulan; mulan seems short, but she's around the same height as some of the men in the army.
Ariel; Ariel just looks short to me. Even in human form, she was tiny.
Jasmine; Short, but not the shortest.
Rapunzel; Rapunzel is shorter than everyone (except the children) in the village. I think it is to show her innocence.
Snow White; Youngest, due to the voice, she hasn't hit puberty yet. I think she is the shortest disney princess.

Please tell what you think and add your own theories on height. Please do not judge to harshly or be rude. Thank you for reading!