When it comes to painting there really is no standard pricing. Each painting contractor prices according to their own method - sometimes informed by experience and knowledge, and sometimes not. You will undoubtedly see a wide range between estimates.
The first thing you can do is figure out the cost of the paint. A typical room (12' x 14') will use 2-3 gallons of paint for the walls and ceiling. Add a gallon if it needs primer. This means the paint for your room will cost between $80 and $200 depending on the paint you want to use (top quality paints will range between $40 and $60 per gallon.
The labor rates will vary widely around the country, but typically painting contractors will charge by the day - $200 to $400 per day is common in the Northeast. A typical room will probably take 2 days. One day for setup, preparation and priming. And then the second day for two coats of paint and clean up. So that means painting a typical room will cost between $500 and $1,000. Remember, this is just a really rough example to give you an idea. Each painting job is different, and the prices you receive for yours may be very different.
If you are thinking of hiring a painter, there at least a few things to keep in mind when doing so. Many people don't understand the difference between a good paint job and a not-so-good paint job, and you don't want to learn the hard way. Here are a few tips to keep in mind when choosing a painter: