If you’re wondering how tall Sukuna is, the answer depends on which form of the King of Curses you’re talking about. In Jujutsu Kaisen, Sukuna’s height changes between his vessel form (when he inhabits Yuji Itadori’s body) and his true, original form.
In Yuji’s body, Sukuna is the same height as Yuji, standing at about 5'8" (173 cm). This is the commonly referenced height throughout the series, since most of Sukuna’s appearances occur while he’s using Yuji as a vessel.
However, Sukuna’s true form is significantly larger and more imposing. When he manifests with additional arms and eyes or appears in flashbacks from the Heian era, his body is noticeably taller and more muscular. While the series never gives an official measurement, fans estimate his original form to stand over 6'3" (190 cm) based on scale comparisons in the manga.
So to summarize:
• Sukuna in Yuji’s body: around 5'8" (173 cm)
• Sukuna in his true form: estimated 6'3"+ (190 cm+)
No matter the form, Sukuna’s presence is unmistakably towering—both literally and in power.