
How Much Paint Will I Need Calculator – Calculate how much paint and primer you need by entering the dimensions of your room below. If you like, add ceiling paint to your estimate.
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How Much Paint Will I Need Calculator
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Paint Coverage Calculator
If you are painting a room, a fence, or your entire house, you may wonder how many gallons of paint you will actually need. There are several ways to achieve this.
The first method is to use the paint calculator above. It estimates the amount of paint, primer, and ceiling paint you’ll need for any given project.
Just enter the size of the area, and the calculator will find the square footage of the walls, and measure the paint and primer needed for that area.
Of course, you can measure the paint without counting once. You can calculate how many liters you need in a few simple steps.
Interior Painting Costs
The first step is to calculate the size of the area to be painted. Paint is an expensive item, and while you want a little extra money for touch-ups later, you don’t want to order more than you need, as it can be returned.
By far, the easiest way to estimate how many gallons of paint you need for a project is to look at the quick reference table below.
This assumes that the paint you use can cover it in one coat. If you are going from light to dark or dark to light, you may need a colored primer and one to two coats of paint or two to three coats of paint without primer to get the color you want.
Paints that contain paint and primer in one will usually cover in one coat, but always check the brand and type of paint you are using for recommendations, especially for bright or dark colors. If you are painting new drywall, then it is a good idea to apply a coat of primer first.
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Using a reference table is quick and easy, but the most accurate way to calculate paint and primer for a project is to measure the areas to be painted and use the coverage ratio for the specific product you are using.
The first step in measuring paint material is to measure the walls or ceiling you will be covering. Measure the height and length of each wall in feet and write them down. It may be easier to round to the next foot measurement for measurements that contain half feet.
You can also measure the walls in inches and convert the area to square feet later to get more accurate measurements, especially for small spaces, closets, or small exterior walls.
The next step in this process is to calculate the square footage of the walls and ceiling. Square footage is a measure of the area of a space, measured in feet, and we have a simple calculator to help with these calculations.
How Much Paint Do I Need?
For each set of measurements from step one, multiply the width and height together to get a square image.
If you are measuring in inches, divide the number you get by multiplying by 144 to convert it to square feet. When doing this method, it is sometimes easier to add up the square inches from each area first, then convert to square feet. Write down the square of each wall.
For example, let’s find a square image of a wall 10 ft wide by 9 ft. height.

On walls with large banks of doors or windows, consider relocating those from the wall of square footage to avoid ordering too much paint. To do that, measure the height and width of each door and window and multiply to get a square picture. Then, remove the door square and picture window square from the wall to find the area that needs painting.
How To Paint A Room
If the walls are not simple or complex rectangles, consider breaking the wall into smaller sections and calculating the square footage of each section. To demonstrate this, if your wall is not a regular rectangle, break it into different sections and measure the square footage of each section. Read more about how to measure unusual walls.
Once you know the square footage of each wall, add them together to get the total square footage. If you have divided complex walls into several areas, be sure to add each area to get the total.
For example, let’s find the total square footage of two walls of 120 square feet and two walls of 150 square feet.
The final step is to find the coverage ratio of your paint and calculate the number of gallons needed to cover the total square footage. Most professionals use a formula of 350 to 400 square feet of wall coverage per gallon of paint and 200 square feet of wall coverage per gallon of primer.
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It is important to note that different brands and manufacturers may cover more or less space. It is also important to note that different application methods, such as spraying, rolling, or brushing, will combine differently.
These calculations also assume that you will be applying an even, solid coat of paint. If you choose to use a faux finish, this will also change the math.
Your paint dealer should be able to tell you the coverage of the paint you have chosen, and it is usually indicated on the container.
For example, let’s find the paint needed to cover 540 square feet using a product that covers 350 square feet per gallon.
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You will need to mix the nearest full gallon or quart. It’s not a bad idea to have leftover paint at the end of a project as it can be used for touch ups, especially with shades that can be difficult to match or vary slightly from lot to lot.
Here’s a tip: estimate the paint and primer needed to cover trim or small areas by taking a picture of the perimeter of the room – or the number of feet around the perimeter, and multiplying this by the length of the trim. To make it more accurate, measure the perimeter in inches or divide the linear feet by 12 before multiplying.
Once you have the total square inches, divide by 144 to get the square feet. This can be an easier method than trying to find the length in feet of fixing something, like a pencil, that might be less than 1 inch long.
You can also measure trim using the above measurement method. Start by measuring the height of the trim in inches, then convert that to feet. For example, a cut that is 4 inches long is 0.33 feet long.
How Much Paint To Buy: An Online Calculator
Then multiply the length by the length of the trim to get the square footage. Then follow the other steps above to measure the amount of paint needed to cover that square footage.
You can measure the exterior paint you will need just like the interior projects. Start by measuring each exterior wall of the home, then calculate the square footage of each.
For gabled walls, measure the square section and the gable section separately. You may find a triangle area calculator useful for finding the square footage of a gable.
Then, add the square footage of each area together. Remove the square footage of any doors and windows that you won’t draw in the perfect square footage.
Thorndown Wood Paint Coverage Calculator
Remember that porous walls such as concrete, brick, or rough wood will absorb more paint than a smooth surface. We suggest you order more paint than you estimate to cover these areas.
Or talk to a paint dealer about what they recommend for painting these areas. Similarly, a home with old wood will need more paint than a home with new wood.
When making significant color changes, you may also need an additional coat of paint to get adequate coverage; be sure to account for this in your estimate.
It would be a good idea to order 10-20% more, maybe an extra quart or gallon, depending on your project, to allow for differences in mix and to have extra touches down the road. If you’re close to a gallon on a small project and want to save money, consider ordering a quart for your overage.
How Much Paint Do I Need To Cover My Walls And Ceiling?
Don’t forget to measure other items needed for the painting project. Learn more about the costs associated with painting work.
Be sure to grab lots of tiles and use blue masking tape to tape off any surface for a clean paint job. Finally, make sure you choose a good brush and rollers; spending an extra dollar or two on these will have as much impact on your finish as the quality of the paint itself.
This can vary depending on the type of paint and the surface you are covering. A general rule of thumb, however, is 1
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