Just me trying to figure things out!

Gabriel Agreste is, according to canon, 7'2.614" tall. Basically 7'3".

Emilie Agreste would come up to his shoulder standing next to him, which you can guess by looking at this picture:

So, she'd be at least 6'3", or maybe a little shorter, but I'd say anywhere from 6' to 6'2".

Adrien gets really tall, you can tell from the episode with Bunnix. Like, when he and Ladybug are facing Bunnix and we can only see their backs. You can't even see Cat's shoulders!

So I would say Adrien would get anywhere from 6'4" to 6'6", not as tall as his dad, but a height that's between his height and Emilie's height. Maybe he'd even reach 6'8", who knows!

But considering his parents are/were giants, Adrien is definitely gonna be a giant, too!