To get basic measurements, measure the length and width of each wall you want to paint in inches. Multiply the length and height together, and divide by 144. This will give you the square footage for each wall. A gallon of paint typically covers around 400 square feet. In some cases, you may need a primer 2 first, then a single coat of paint, meaning that you may need one gallon of primer and one gallon of paint to cover 400 square feet. However, if the wall requires multiple coats, this will increase the total amount of square footage required, and therefore the amount of paint.
When calculating total cost of your project, one of the most important factors to consider is the paint itself. Paint costs will be determined by the quantity of paint and primer required to complete your project, as well as the quality of the paint you choose. You can use this paint calculator to estimate how much paint you will need.. Once you have an idea what you're working with, go to your local home improvement store and compare the costs of a gallon in person. Painting professionals can also quote average prices from their years of experience working with different paint qualities.
The companies with the best paint products are Benjamin Moore, Dunn Edwards, Sherwin Williams, and Vista Paint. As a painter I don't recommend Berh from Home Depot as much because it's quality is just marketing. Flat paint has no sheen and it shows its true color, but is not easy to wash or clean. Satin, eggshell have low sheen and is washable. Semigloss ang glossy has a high sheen and these paints are recommended for bathrooms and kitchen or where there's high humidity and steam.
Also, don't be afraid to ask if the painters are trustworthy people. Unfortunately, there are plenty of cases where a painter has stolen items from a home or caused damage to the house or injury to the homeowner. Subcontractors may not be as skilled as employees, and the contractor you're hiring may not have much experience working with them, making them more of a risk. Additionally, ask if the painters are employees or subcontractors, and what the screening or hiring process is like. If the company conducts background checks, that's a good sign. 
"There's wisdom in a multitude of counsel" {Bible Book of Wisdom/Proverbs} I thank you all I learned so much here not only painting but contracting in general. After all this I realize how blessed my ignorance not taken advantage of by Greater Philadelphia area motivated young skilled pride-in-work honest hardworking + seasoned older employee of Scott Gribling Painting of Lansdale PA. I'm proud I had the idea that Tom Parkinson here taught me the phrase & affirmed paying daily "progress draws" & purchase receipts instead of advance deposit in case something happens to contractor, and as Tom teaches the natural effectiveness of receiving from the day's work :)
When their bids are successful, contractors meet customers to finalize their requirements and plan the order and timing of work. Contractors estimate the time required for surface preparation, painting several coats and drying time between coats. For interior painting jobs, they might have to allow time for clearing rooms. Exterior painting schedules might be dependent on the weather in different parts of the country. Exterior painting is not practical in very wet or very cold conditions.
If you decide to hire help, have several contractors inspect the job and provide proposals. You'll probably find huge price differences for the same job. A Checkbook undercover shopper got quotes from nine Washington-area contractors to repaint the walls, ceiling and trim for a living room, dining room, family room, bathroom and kitchen. Including paint and supplies, prices ranged from $2,650 or less to more than $6,500.

I do not mean to come off with an edge, however, this is an article for people hiring low bid, uninsured, one man band painters out to "hustle" a buck. Hire reputable, established companies or hire someone you know or have a strong referral from. If you are arguing over watered down paint, ticky, tacky deposits, buying your own supplies, you have hired the wrong guy.

The BBB isn't a painter-specific group but rather an organization that is dedicated to ensuring that consumers can access information about anyone they do business with. The BBB also rates companies based on a Standards of Trust scale, which goes from A+ to F. A company doesn't have to be a member to get a grade, and it's a good idea to check to see how your contractor is scored as well as its membership status.
Before the scrubdown, protect nearby plants by misting their leaves and saturating the surrounding soil with water, pulling them away from the house, and shrouding them in fabric drop cloths. (Plants will cook under plastic.) Lay more drop cloths along the base of the walls to collect any falling paint debris. Walls should be wet down before getting scrubbed, then washed with a gallon of water mixed with 1 cup chlorine bleach and 1 cup of either a concentrated, phosphate-free cleaner, such as a trisodium phosphate (TSP) substitute, or Jomax House Cleaner. Working in sections, from the bottom to the top, will avoid streaks. Be sure to rinse walls well before the solution dries. Wood siding and trim should be ready to paint after a day or two of dry weather.
I did go with the highest bidder and it did not matter. They did a shoddy job and threatened to take me to court when I pointed out mistakes that they made based on their work standards stated on the quote. I have not paid them yet, just filed a complaint with the BBB. No money down asked, no contract signed. The boss stated I have to high of expectations just because I live in a 121 year old house!

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