Cirrus Light 
Sciencepone of Science!
I don't understand how there can even be an argument when we have what are effectively empirical data points;
>>991140p
The best one is the one I called "EQG Doorframe", since there is a standard size for doorframes, and even if that's off, late-teen girls should be about 5'6", anyways, but Angel will be the same size in both worlds since bunnies exist normally in both, so it's more or less a nail in the coffin to any other theories on pony sizes.
Source for doorframe work:
>>395227t
We also have the "eight foot candy cane", and I saw a graphic comparing the size of ponies against butterflies that fly around them at some points in the show. That method is admittedly less vetted than the others. This was done in the doorframe image above, but"[I've also done it on my own more succinctly here, too.":](https://www.deviantart.com/eagle1division/art/My-Little-Pony-How-Little-311034846
)
There's also the "Apple Theory" which uses the average size of apples with the apples we see in the show and compares them to Applejack (who's standing next to them in that frame). Again, also used in the doorframe image, but I'm going to put the image here, too, just to show the work:
There's also, as someone mentioned, the bloopers reel:
>>1162182t
Also the intro to EQG has this:
>>1529869t
For an average 5'6" young woman/late teen, that means the ponies are around 3'5"
Finally, we also have this:
>>1529617t
and this screencap:
>>541249t
both giving right around - just under 4 feet.
And now of course, we also have this image I'm commenting on, here.
They are in-between 3 and 4 feet. At this point, it's not a matter of opinion or headcanon, given the sheer amount of proofs we've had of this range.
And it seems the creators are very surprisingly consistent about that.
But given the sheer amount of proofs of the 3-4 foot range, anything that points to a different size is basically a data scatter unless a few of them start to pile up.
>>991140p
The best one is the one I called "EQG Doorframe", since there is a standard size for doorframes, and even if that's off, late-teen girls should be about 5'6", anyways, but Angel will be the same size in both worlds since bunnies exist normally in both, so it's more or less a nail in the coffin to any other theories on pony sizes.
Source for doorframe work:
>>395227t
We also have the "eight foot candy cane", and I saw a graphic comparing the size of ponies against butterflies that fly around them at some points in the show. That method is admittedly less vetted than the others. This was done in the doorframe image above, but
There's also the "Apple Theory" which uses the average size of apples with the apples we see in the show and compares them to Applejack (who's standing next to them in that frame). Again, also used in the doorframe image, but I'm going to put the image here, too, just to show the work:
![full](http://i.stack.imgur.com/EuepU.png
There's also, as someone mentioned, the bloopers reel:
>>1162182t
Also the intro to EQG has this:
>>1529869t
For an average 5'6" young woman/late teen, that means the ponies are around 3'5"
Finally, we also have this:
>>1529617t
and this screencap:
>>541249t
both giving right around - just under 4 feet.
And now of course, we also have this image I'm commenting on, here.
They are in-between 3 and 4 feet. At this point, it's not a matter of opinion or headcanon, given the sheer amount of proofs we've had of this range.
And it seems the creators are very surprisingly consistent about that.
But given the sheer amount of proofs of the 3-4 foot range, anything that points to a different size is basically a data scatter unless a few of them start to pile up.