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How many sides are you painting and what is the unit?

It depends on the height of the ceilings. If they are 10 feet, that would put the painted area at 400 square feet. Paint covers approx 350 - 400 square feet per gallon over a sealed surface, depending on the texture of the wall so it would take about a gallon of paint for one coat. Lower ceilings will use a little less, cathedral or tall ceilings more. Add in another gallon if you are painting the ceiling.

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12y ago
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15y ago

The equation for finding square footage is length x width x height.
Once you have that number subtract any large areas you do not intend to paint (windows, doors etc - height x width)
Determine if you intend to do one coat or two, (two is recommended so double your area).
Generally speaking a gallon of paint will cover approximately 400 square feet. When in doubt, err on the side of caution and order a bit more than you need. This will give you the extra you may need for touch-ups or in case of a minor spill or miscalculation.

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14y ago

First determine the square footage.

Height of wall - times - total circumference of room - less major openings - equals sq. ft.

Next read the label of the can of paint. It will give you the approximate coverage.

Assume you will get the minimum amount of coverage listed and remember you will most likely need two coats (unless the colour is very dark, in which case you may need three or even four coats to completely cover).

If you are buying a custom (or mixed) colour it is better to err on the side of too much, as even with the new computer matching technology available EVERY can mixed will be just slightly different. That is why you should "box" (mix together all cans of the same colour) your paint, to assure perfection.

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10y ago

You will need at least 1 gallon of paint to paint 10x10 room.

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12y ago

Approximately 5 litres will do it.

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Q: How much paint do you need to paint a 20X30 room?
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The amount of paint required depends on all three dimensions of the room - length, width and height - not just two. Also, it will depend on the coverage of the paint, the quality and porosity of the surfaces to be painted.


WHen i get paint samples how much can i get?

You will be able to use as many paint samples as you need. These samples are only used to compare color contrast or brightness. By finding alot of paint samples suited for your room, you should be able to determine how many you need


How do you come up with a price quote when charging to paint a room?

There is a formula used to calculate how much paint you need to paint a room. Determine what the square feet of the room you are painting is and multiply it by the number of coats you want to put on the walls. Divide that number by 400 and you will end up with the number of gallons of paint you need. The other choice is to use an online paint calculator.


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depends on what country you're in, how many coats of paint, and what type of paint.


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It depends on the covering properties of the paint. That will depend on the surface being painted.


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How many gallons of paint do you need for a 12 x 18 ft room?

It will depend on the preparation of the area to be painted and the coverage of the paint.