Ser Duncan the Tall is described in canon as being one inch shy of seven feet tall, so his height is about 6'11" (roughly 210 cm).

How tall is Ser Duncan the Tall?

In George R. R. Martin’s Dunk and Egg stories, Ser Duncan earns his nickname because he is “an inch short of seven feet,” which places him at around 6'11". In metric terms, fans commonly round this to about 210 cm, making him one of the tallest known knights in the setting, taller even than most famously large characters except the absolute giants like Hodor or the Mountain in some depictions.

Book canon vs. show portrayal

  • In the books and companion material, Duncan is repeatedly framed as “nearly seven feet tall,” emphasizing that his stature is extraordinary even among warriors and lords.
  • Fan discussions and Q&A breakdowns often settle on 6'11" / 210 cm as the best concrete number, based on in‑world measurements mentioned by characters like Maester Aemon.

Context in the world of Westeros

  • At just under seven feet, Dunk is roughly comparable in height to figures like Greatjon Umber and is taller than Brienne of Tarth, who is around 6'3".
  • His unusual height is not just a visual detail; it underlines his role as a legendary knight whose presence is physically and morally imposing in the Tales of Dunk and Egg and later histories.

Information gathered from public forums or data available on the internet and portrayed here.