RICHARD says on 18/Sep/11
Didn't look much shorter than Michael Richards in Problem Child.About a 4 inch difference tops.

lorne says on 12/Sep/11
A legit 5'11 guy.Wasn't much shorter than 6ft Chris meloni.Honestly, he could look 181cm on Three's Company, but I dunno...
For now, I say 5ft11 flat...Maybe 5ft11.25in when he was younger.
(RIP John)

Legend says on 2/Jun/11
pb says on 16/Apr/11
the more i watch reruns of three's company, the more i think he wasn't quite 5'11". there were numerous guest stars on the show whose heights are well-known (jeffrey tambor, among others), not to mention the heights of his female co-stars (joyce dewitt, suzanne somers, priscilla barnes, jenilee harrison) - and compared to them, ritter didn't look to be the height he's listed here.

whenever ritter (as jack tripper) stooed next to a legit 6'0"+ guy like jeffrey tambor, he didn't look to be within an inch or so. at the same time, whenever the blonde girls on the show wore heels, they didn't appear to be as short as they should have if ritter were a legit barefoot 5'11. it was especially notable in the case of jenilee harrison, who is listed as 5'8" but looks taller than that on three's company. when she wears heels on the show, she's noticeably taller than ritter - and that shouldn't be possible if he's a legit 5'11" barefoot, even if she's wearing 3 inch heels.

my conclusion is that ritter was more like 5'10" or 5'10.25" barefoot. that explains why he could look close to 6" at times and why he could also get towered over by legit 6'0"+ guest stars.
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I agree actually.

pb says on 16/Apr/11
the more i watch reruns of three's company, the more i think he wasn't quite 5'11". there were numerous guest stars on the show whose heights are well-known (jeffrey tambor, among others), not to mention the heights of his female co-stars (joyce dewitt, suzanne somers, priscilla barnes, jenilee harrison) - and compared to them, ritter didn't look to be the height he's listed here.

whenever ritter (as jack tripper) stooed next to a legit 6'0"+ guy like jeffrey tambor, he didn't look to be within an inch or so. at the same time, whenever the blonde girls on the show wore heels, they didn't appear to be as short as they should have if ritter were a legit barefoot 5'11. it was especially notable in the case of jenilee harrison, who is listed as 5'8" but looks taller than that on three's company. when she wears heels on the show, she's noticeably taller than ritter - and that shouldn't be possible if he's a legit 5'11" barefoot, even if she's wearing 3 inch heels.

my conclusion is that ritter was more like 5'10" or 5'10.25" barefoot. that explains why he could look close to 6" at times and why he could also get towered over by legit 6'0"+ guest stars.

Legend says on 9/Nov/10
I like him so much, he was special and no one was ever like him. 5'11.25 peak probably.