How tall is Kristian Nairn

Northern Ireland born actor and DJ best known for playing Hodor on HBO series Game of Thrones. On his own website's 'about me' section it used to mention "Standing at 6'10" tall" and Kristian claimed on Twitter to be "6ft 11 ish" and also "I'm either 6ft 10 or 11 depending on the measuring tape". He also mentioned "After all these years, there is only one thing that makes me self conscious about my height. Airplanes.".5ft 8 Rob and Kristian @ LFCC 2013
[Height Comparison]

I'm 41 and I'm 6ft 10in. Some people say I'm 6ft 11in, some 6ft 9in. I don't want them to shave off an inch, but I don't want them to add an inch either to disappoint people.