An example of the wall measurement would be: 40 linear feet of bedroom space, x 8 wall height, = 320, x 2 = 640. Minus 1 door (60) and 2 windows (80) = 500 sq feet being painted. Then divide the 500 by 400 (sq feet per gallon), and you get 1.25 gallons (4.73 L) needed for that room. For this, you'd need 1 gallon (3.8 L) and 1 US-quart (950 ml). If the amount it comes out to is over 1.3, we recommend just getting 2 gallons (7.6 L) so that you have leftovers if needed, since 2 US quarts (2,000 ml) costs essentially the same as a gallon in most stores.
If you have two weeks, a ladder and some experience, this makes an excellent DIY project. On most surfaces, it is forgiving of mistakes and easy to work with. Correcting mistakes only adds more time and not much more expense. However, a professional will get it done faster and with a better finish. If you don’t have 2 to 3 weeks to spare, find a professional painter near you today.
Practicing ladder safety is key. When using an extension ladder, always test that its resting at the right angle by putting your toes against the feet of the ladder and extend your arms outwards. At the proper angle, you should be able to rest your hands on the rung in front of you comfortably. When on a ladder, you should always keep your hands free and maintain a steady center of gravity.