I don’t think James Potter is tall, so isn’t Harry
https://www.tumblr.com/hp-confessions/791252800098205696/james-was-described-as-tall-from-voldemorts-pov?source=share
What do you think?
I don't think James and Harry were *super tall* but, I definitely think they were taller than average (5'8-5'9 (174.4cm) in the UK in 1998). The explanation from the confession isn't one I think makes sense when combined with everything else we know. Besides, I don't think Voldemort would call James "tall" if it were just a contrast with Harry; I don't think he would've used the word "tall" if he weren't tall.
Also, if we follow the trajectory of Harry's height throughout the books as I did here, he is around 5'2 (~157cm) in PoA:
He [Peter] was a very short man, hardly taller than Harry and Hermione
(PoA, Ch19)
Then he has a big, noticeable growth spurt in OotP:
He was a skinny, black-haired, bespectacled boy who had the pinched, slightly unhealthy look of someone who has grown a lot in a short space of time
(OotP, Ch1)
And another big, noticeable growth spurt in HBP:
“You’re like Ron,” she sighed, looking him up and down. “Both of you look as though you’ve had Stretching Jinxes put on you. I swear Ron’s grown four inches since I last bought him school robes. Are you hungry, Harry?”
(HBP, Ch5)
“And it doesn’t hurt that you’ve grown about a foot over the summer either,” Hermione finished, ignoring Ron.
(HBP, Ch11)
But still not over 6' (~183cm) in DH:
Once the painful transformation was complete he was more than six feet tall and, from what he could tell from his well-muscled arms, powerfully built
(DH, Ch12)
So I usually place Harry and James as 5'11 (~180-181cm, though I headcanon them as 181cm) and I think the text supports that.
You can note that since GoF, Harry is no longer described as short and scrawny like in the first 3 books (Harry gets a description at the start of most of the books):
"Harry had a thin face, knobbly knees, black hair, and bright green eyes." - PS
"Harry, on the other hand, was small and skinny, with brilliant green eyes and jet-black hair that was always untidy" - CoS
"Harry, though still rather small and skinny for his age, had grown a few inches over the last year" - PoA
"A skinny boy of fourteen looked back at him, his bright green eyes puzzled under his untidy black hair" - GoF, still skinny, but no longer short for his age.
"He was a skinny, black-haired, bespectacled boy who had the pinched, slightly unhealthy look of someone who has grown a lot in a short space of time" - OotP, Skinny, but taller after a growth spurt. Not described as short or small for his age as pre-GoF
"and the artificial light drained his face of all color, so that he looked ghostly beneath his shock of untidy black hair" - HBP, again, not described as short.
Because he isn't.
Additionally, Ginny is around 5'1 (~155 cm) (shorter than Luna, and repeatedly described as "small"), and Harry seems to be considerably taller than her, in HBP:
Harry looked over the top of Ginny’s head to see Dean Thomas holding a shattered glass in his hand, and Romilda Vane looking as though she might throw something. Hermione was beaming, but Harry’s eyes sought Ron. [...] he grinned down at Ginny
(HBP, Ch24)
He looks over her head at the crowd, easily scanning the room. This implies he is, at least, around a head taller than her, allowing him to do so with no effort.
And Draco, is only *slightly* taller than Harry:
Harry did not dare look directly at Draco, but saw him obliquely; a figure slightly taller than he was
(DH, Ch23)
As in, an inch or two at most (I usually lean towards a half-inch to an inch difference).
Harry is the same height as Narcissa early in HBP:
“Really?” said Harry, taking a step forward and gazing into the smoothly arrogant face that, for all its pallor, still resembled her sister’s. He was as tall as she was now. “Going to get a few Death Eater pals to do us in, are you?”
(HBP, Ch6)
Who is described as tall:
His mother was blonde too; tall and slim
(GoF, Ch8)
Hermione, at around 5'5 (~165 cm) is considerably shorter than Harry:
Hermione and Mundungus were shooting upward
(DH, Ch)
While Bellatrix is taller than Harry (I assume not by much):
She was taller than he was, her long black hair rippling down her back, her heavily lidded eyes disdainful as they rested upon him
(DH, Ch26)
And she's tall for a woman in general:
a tall dark woman with heavy-lidded eyes
(OotP, Ch6)
And Snape is taller than Narcissa (if not by much, probably):
Snape caught hold of her wrists and removed her clutching hands. Looking down into her tearstained face
(HBP, Ch2)
Both Bellatrix and Narcissa are tall for women. I usually place Narcissa at 5'9 (~175-176 cm), so Bellatrix and Draco are taller than her, and Harry grows 1-2 inches throughout HBP and DH (which is reasonable for a teen boy).
So, I do think Harry and James were tall. Not super tall like Dumbledore (around 6'5 or 195-196 cm) or Ron and Voldemort (around 6'3 or ~190cm), but taller than average in the UK and definitely not short.
(I also want to note that when Harry and James were an "inch apart" in OotP, James was also 15-16. 15-year-old Harry is almost as tall as 16-year-old James, not adult James)
I see Harry's height during the books as something like this:
Book 1 - short and scrawny - ~4'6 (137-138 cm)
Book 2 - still short and scrawny - ~4'8 (142-143 cm)
End of book 3 - the same height as 14-year-old Hermione and adult Peter, grew by "a few inches" since CoS - ~5'2 (157-158 cm)
Book 4 - not much information, so this is a guess - ~5'4 (162-163 cm)
Book 5 - has a considerable growth spurt - ~5'7 (170-171 cm)
Early Book 6 - Another considerable growth spurt that ends him at around Narcissa's height - ~5'9 - 5'10 (176 - 178 cm)
End of book 7 - same height as James at 21 - ~5'11 (he's 181 cm in my headcanon, but he can/would say 6' if asked)
Sorta want to add here my headcanon/speculative approximate heights for other characters (some with more evidence than others):

















