dude anything is posible
How much have your rating improved?

My chess.com rating went like this:
April 2011 : 1150
May 2011 : 1300
June 2011: 1400
July 2011: 1450
August 2011: 1470
September 2011: 1500
Now: 1550

100 points in a year? That's insane. I can fluctuate 100 points either way in a single hour, depending how I'm playing. Seriously.

Your current rating score also plays a big factor in terms of how much you can earn in one year.
If you're starting at 1000, for example, it is very, very possible to gain 400 points, even 500 or 600 to round out the year at 1400-1600!
However, if you are starting at 1600, it will be much, much harder to move up to 2000-2200 in just one year. For the vast majority of people, this will take several years, or ten years, or a lifetime.
Also, if you're talking about Standard Turn-Based Online Chess, how much "help" your willing to receive in your games will be a big factor. For example, if you're willing to use the "Analysis Board" as a tool to aid your calculation, you will play a stronger game, and thus you will have a higher rating than if you did not use this tool.

Thanks, Dana...!
Skwerly, naturally there are "mood swings" to ones rating, but there is likely to be a trend.

I think with the right work ethic someone can easily go from beginner to expert (2000+) in 2-3 years

I started out here one year ago and now I'm 2109, but I'm over-rated thanks to a few forfeit wins vs players about my current rating (one of them was a dead loss for me BTW) so I'll be happy to maintain a +2000 rating after my current crop of games, almost all of which are vs. players about 2000 or higher.
I've been playing for 40 yrs and my peak USCF OTB rating was 2007 back in the early 80's. Right now I'm rated 1846 at ASPCC and 1560 at IECC :( and I'm +38 -5 = 8 so far for whatever that's worth.

gaining 800 is possible if you play 2700ish players on this site and hope they forget to log on or they get caught for cheating.

Perhaps also fun to know what I learned with my rating improvements.
1150 - Knowing the rules with exception of en passant + experience of about 100 chess games from when I was 8-9 and member from a chess club. Didn't play much chess in the 12 years in between.
1300 - After learning some basic tactics, like pins and forks
1400 - A little opening knowledge, more tactics.
1450 - More tactics and basic king pawn endings.
1500 - Learning to play against d4, more tactics and more king pawn endings.
1550 - More of the previous + basic rook endings + making a beginning with strategy.

That's an interesting list, Dana.... So your path was basically tactics, tactics and more tactics. I'm only now beginning to get a hold of tactics. My understanding of positional concepts is way better than my ability to spot tactics. I'm rated 1,576 right now, but only a little more than 1,300 in the Tactics Trainer.
NimzoRoy, looking at your stats, I see you improved about 450 points in a year. How many hours related to chess weekly, including everything (playing, studying, analyzing...)?

That's an interesting list, Dana.... So your path was basically tactics, tactics and more tactics. I'm only now beginning to get a hold of tactics. My understanding of positional concepts is way better than my ability to spot tactics. I'm rated 1,576 right now, but only a little more than 1,300 in the Tactics Trainer.
I prefer to set tactics trainer at practise mode and solve problems between 1000 and 2000. That way I have more time to look at the position and understand the tactics and learn something, inplace of rush the tactic and I don't know if I have a very easy 1000 rated tactic or a very difficult 2000 one. Also otb chess which I started with a few weeks ago I play 1:45 + 15 minutes games and I already play way too fast, so want to train myself to take more time and actually look at the position inplace of doing a quick move in 10 seconds and hoping that it's good.
However last time I tried the rated mode I ended up with a rating between 1400 and 1500.
I barely know any positional things, except the basics such as double pawns are generally bad, knights are better in closed postions and bishops in open positions, rooks love (half) open files, space is an advantage and that the pieces are placed well if they can move to a lot of squares. But those things I read in between and my understanding doesnt go much deeper then how I wrote it here.
I've heard that one can only hope for an rating improvement of 100 points yearly. Others say 400 is possible. But what does the data say? How much have your rating (on Chess.com) improved in the time you've been a member on Chess.com (not counting the first month or so, when the rating adjust to ones pre-Chess.com level)?
Is it 100 points in a year? Or maybe 250 points in 4 months? Or only 30 points in 10 years? I'm curious.
I'm primarily interesting in Standard Turn-Based Online Chess, not Live Chess.