My Literal Height Comparison To The Main Four And Urami:

My literal height comparison to the main four and Urami:

Jesus.....

𖦹 𝐂𝐨𝐦𝐩𝐚𝐫𝐢𝐬𝐨𝐧 𝐨𝐟 𝐭𝐡𝐞 𝐔𝐩𝐩𝐞𝐫 𝐌𝐨𝐨𝐧𝐬' 𝐡𝐞𝐢𝐠𝐡𝐭𝐬 𖦹

Since the design material collection books finally arrived, I was able to scan some of the pages and visualize the demon's heights. Some of them are officially stated while for others, I had to approximate based on comparison. Explanation for each of those is stated below.

First of are Muzan (179 cm), Kokushibo (190 cm), Doma (187 cm) and Akaza (173 cm). Their heights are all officially stated in the Demon Corps Records.

Next are Hantengu (166 cm), Gyokko (between 150 and 170 cm in his vase), Daki (~ 178 cm) and Gyutaro (~ 190 cm). The later two don't have an official height mentioned but the size of the head is a good measure to compare the characters in the official designs. Daki is of course taller because of her shoes, while in the anime, Gyutaro is hunched over a lot. But from the image of the design material from the Entertainment District Arc which I've used, you can see what his height is standing straight, or at least as straight as physically possible for him.

I'd like to add that while Gyokko's height is known, if you go based off the official art, he can be taller than 170 cm, depending on how straight he positions himself and how far he comes out of his vase.

Hantengu's clones

Looking at the clones next, you can see Zohakuten (~ 165 cm) and first-split Sekido and Karaku (~ 190 cm). Zohakuten's height is more or less official since we are shown the direct comparison with Tanjiro. The other two were again compared with the head sizes and proportions.

Second-split Sekido and Karaku as well as Aizetsu and Urogi are generally the same size (~ 190 cm) since their proportions don't really change. However, Urogi's anatomy generally affects his height, but not too much as when he's standing on his legs, his hips would be around the same height as the others'.

The smallest of the clones is the main body / fear clone (~ 19 cm). The tallest being Urami (~ 260 cm) who is seen directly next to Tanjiro in the design material.

Gyokko's height when morphed

Morphed / true-form Gyokko (~ 215 cm) is directly compared to Muichiro whose height is known (160 cm), making a visualization of his size easy.

(An approximation of his tail length may follow.)

Ranking

From tallest to smallest, Muzan and the upper moons as well as their other forms can be ranked as followed:

Urami - 260 cm

Morphed Gyokko - 215 cm

Kokushibo ︱ Sekido, Karaku, Aizetsu and Urogi ︱ Gyutaro - 190 cm

Doma - 187 cm

Muzan - 179 cm

Daki - 178 cm

Akaza - 173 cm

Hantengu - 166 cm

Zohakuten - 165 cm

Gyokko - ∅ 160 cm

Hantengu / Fear Clone - 19 cm