Are Tolkien Elves taller or shorter than Men?
In general fantasy, elves are frequently smaller than humans. But I seem to recall that in Tolkien they aren't.
Based on this SFF.SE comment
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Tolkien's Elves are of a similar size to Men. However, they tend to be slimmer, and probably slightly taller on average, although there are no direct comparisons recorded. A couple of examples:
Thingol, King of Doriath in the First Age and many-times forefather of Elrond and Aragorn, was described as "tallest of all the Children of Illúvatar" (which includes both Elves and Men).
Both when we meet Galadriel and Celeborn for the first time, and again when we meet Círdan the Shipwright in the White Havens at the end of Lord of the Rings, the phrase "Very tall they were/he was" is used. Again, no direct comparison, but given that the company includes Aragorn and Boromir the first time, and Gandalf the second time, it's certain that they were tall in comparison to Men.
They are certainly not small pixie-like elves like you find in a lot of fairy-tale settings - we know that Hobbits and Dwarves were of similar heights (although again Dwarves were much stockier than Hobbits) and the Elves were certainly not in that category.
I found some good info on this question here:
This addresses questions of height among many Tolkien characters including Thingol, the Númenoreans, the declination of height with decreasing noble lineage, and the upper/lower limits on some of Middle-Earth's tallest mortals and elves (with citations in "The Unfinished Tales of Númenor", "The Silmarillion", "The Peoples of Middle-Earth", and a few JRRT letters).
In summary these are some estimates given:
Boromir ~ 6'4
Most men of Noble Numenorean blood during the 2nd Age ~ 7' was common
Elves (even more than Hobbits) could walk when they wished without sound or footfall. Pippen soon began to feel sleepy, and staggered once or twice; but each time a tall Elf at his side put out his arm and saved him from a fall.
LOTR: The Fellowship of the Ring -- chapter 3 -- Three Is Company
I know you've already picked the (very nice) answer above, but I thought I'd add the blurb where Frodo et al first meets Elves after they leave the Shire. It's not a perfect quote, unfortunately, as likely any beings, aside from the Dwarfs would appear quite tall to a Hobbit, but if you take the quote at face value, Elves are tall.
Actually, it is a more complex question that it first appears. In the writings of JRRT, elves are indicated as beign taller than men at the time. I always visualised them as a foot taller, but not as stocky.
However, it is also clear that at the end of LotR, the elves are waning, and men are waxing. There is some implication I believe - I cannot remember the precise passages, as they are probably from the History of Middle Earth - that this may mean that the stature of men is increasing. The elves are the same elves, so will not shrink, but they may become less taller than men ( if that makes sense ).
So it could easily have been that elves were around 6ft tall, while men were more like 5ft. As men have increased in size, the difference is less significant.
Tolkien consistently described Elves as "tall". He described unusually noble men/races-of-men as "tall". Tolkien was very clear that even the noblest of men, the Numenoreans, aren't as tall as they used to be. Elves are immortal, ergo, any 1000+ year old elf (a young elf!) is pretty certainly going to be taller than a man born 30-40+ generations later.
In my opinion it seems like elves and men were of similar stature in the ancient days, but as Elves faded they generally became somewhat shorter and phisycally weaker. This opinion comes from this passage of the Silmarillion (roughly translated from my spanish version):
In those days Elves and Men had similar strength and stature, but the elves wisdom, skill and beauty was greater; and those who had dwelt in Valinor, and contemplated the Powers surpassed the Dark Elves in these things, much as they surpassed in turn the people of the mortal race.
It seems to me, considering Tolkien works, that some attributes (like strength and height) diminished in elves as their spirit (or light) burned their bodies away. This process doesn't happen at the same rate, thus you have Míriel (Fëanor's mother) diminishing rather quickly and, on the other hand, you have Galadriel and Celeborn, remaining indeed very tall.
It may be argued that the fading is just metaphorical, but in Tolkien metaphorical and physical usually go hand in hand:
As ages passed the dominance of their fëar ever increased, 'consuming' their bodies (as has been noted). The end of this process is their 'fading', as Men have called it; for the body becomes at last, as it were, a mere memory held by the fëa.
History of Middle-earth X Morgoth's Ring Part 2 "The Second Phase" Chapter 3: "Laws and Customs Among the Eldar" Of Death and the Severance of Fëa and Hröndo [> Hröa]
Yet, it seems that some Elves, and all the examples seem to point only to the Higher Elves (which had spent long time in the Blessed Kingdom, maybe blunting or actually overriding their waning), were very tall and remained that way through many ages.