Calculate exactly how much paint and primer you need by entering the dimensions of your room below. Optionally, incorporate ceiling repaint in your estimate.

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How to calculate Paint and also Primer

When you’re paint a room you could be wonder how many gallons of repaint you’ll actually need. There room a couple of methods to number this out.

The an initial method is to use the paint calculator above. It approximates the amount of paint, primer, and ceiling repaint you’ll require for the project.


Simply enter the dimension of her room, and also the calculator finds the square footage of the walls, then estimates the paint and primer needed for that area.

Of course, you have the right to estimate repaint without a calculator as well. You can calculate how many gallons you need in a few simple steps.


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The first step is come calculate how much repaint you need. This is likely the many costly material and is frequently not returnable if girlfriend order too much, so acquiring it best is important.

By far, the easiest method to calculation how countless gallons of repaint you require for a project is to consult the fast reference table below.

Paint Coverage Estimates

This table shows the approximated amount the paint essential for average-sized rooms.

One gallon of common latex repaint usually consist of 350 to 400 square feet of wall area.

Amount that paint needed to covering the median sized room, making use of a conventional latex paintRoom SizeGallons of paint Needed
small room (8′ x 8′)1 gallon
medium room (12′ x 12′)2 gallons
large room (18′ x 18′)3 gallons
bathroom1 gallon
kitchen1-2 gallons
bedroom2 gallons
family room3 gallons

How to measure a Room

Using a reference table is quick and easy, yet the many accurate technique of calculating paint and primer because that a job is to measure up the surface to it is in painted and use the coverage calculation for the specific product you’re using.

Step One: measure the Walls

The very first step in estimating paint material is to measure the wall surfaces or ceilings you will certainly be covering. Measure the length and also height the each wall in feet and also write castle down. It may be simplest to round as much as the next foot measurement for measurements that contain partial feet.

Step Two: calculation Square footage of each Surface

The following step in the process is to calculate the square clip of the walls and ceilings. Square clip is an area measure up of a space, measure in feet, and also we have a straightforward calculator to help with these calculations.

For each set of measurements from action one, main point the width and also height together to get the square footage. Make sure your measurements are in feet before multiplying. Compose down the square clip of every wall.


For example, let’s find the square clip of a wall that is 10 ft. Wide by 9 ft. High.

sq ft = 10 ft. × 9 ft.sq ft = 90 sq ft

Pro Tip: use an area calculator to uncover the area of facility wall shapes.


For walls that have big banks of doors or windows, take into consideration subtracting the area the those from the wall surface square footage to protect against ordering too much paint. To carry out that, measure up the length and height of each door and window and main point to find the square footage. Then, subtract the door and window square footage from the wall surface square clip to uncover the area that requirements paint.

If the walls space not an easy rectangles or space complex, then take into consideration breaking the wall surface into smaller sized sections and also calculate the square clip of each section individually. To illustrate this, if your wall is no a typical rectangle, rest it into different sections and measure the square footage of each section. Learn more about just how to measure irregular walls.

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Illustration showing exactly how to rest up a complicated wall shape into smaller pieces to measure.Step Three: include Square Footages with each other to find the Total

Once you recognize the square clip of each wall, include them with each other to uncover the total square footage. If you had split facility walls into several surfaces then be sure to add each surface to get the total.


For example, let’s find the complete square footage for 2 wall surfaces that space 120 square feet and 2 wall surfaces that room 150 square feet.

total sq ft = 120 + 120 + 150 + 150total sq ft = 540 sq ft


Step Four: Calculate repaint Coverage

The last step is to find the coverage proportion of her paint and calculate the variety of gallons needed to covering the total square footage. Most experts use the formula of 350 come 400 square feet of wall coverage per gallon of paint and also 200 square feet of wall coverage per gallon the primer.

It’s essential to note that different species and manufacturers may cover more or much less area. It’s additionally important to keep in mind that various application approaches such as spraying, rolling, or brushing will certainly cover differently.

Your paint merchant should be able to tell girlfriend the coverage for your selected paint, and also it’s regularly indicated top top the container.

Divide the total square clip by the coverage rate to find the number of gallons needed.


For example, let’s find the paint essential to cover 540 square feet utilizing a product that covers 350 square feet every gallon.

gallons = sq ft ÷ coveragegallons = 540 ÷ 350gallons = 1.54 gallons


How to Estimate repaint for Trim

Here’s a tip: estimate the paint and primer needed to covering trim or little surfaces by adding the size of the room and set the elevation of the room in inches come the elevation of the trim.

You can also estimate trim using the measurement technique above. Start by measuring the height of the trim in inches, then convert that to feet. Because that example, trim the is 4 inches high is .33 feet tall.

Then multiply the elevation by the size of trim to uncover the square footage. Then follow the remainder of the steps over to calculation the paint necessary to cover that square footage.

How to estimate Exterior Paint

You have the right to estimate exterior paint you’ll need similar to interior projects. Start by measuring every exterior wall surface of the home, then calculate the square clip of every one.

For walls with a gable, measure the square part and the gable part separately. You might find a triangle area calculator beneficial to discover the square footage of the gable.

The, include the square footage of every area together. Subtract the square footage of any type of doors and also windows that you won’t be paint from the complete square footage.

Consult the directions on the specific product you’ll be using for a coverage estimate.

Keep in mind the walls through porous surface such together concrete, brick, or rough wood will soak up much more paint 보다 a smooth surface. We indicate ordering an ext paint 보다 you calculation to cover this surfaces.

When make dramatic color alters you might also need second coat of repaint to gain adequate coverage; be sure to account for this in your estimate.

Estimation Tips

It might be a great idea come order 10-20% extra, probably an extra quart or gallon relying on your project, to enable for distinctions in coverage and also to have extra product for touch-ups under the road. If you are fairly close come an even gallon top top a little project and also want to save some money, take into consideration ordering a quart for her overage.

Don’t forget to estimate other supplies required for a painting project. Learn much more about the costs connected with a paint project.

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Be sure to take plenty that tarps and use a great blue masking tape come tape off any surfaces because that a clean repaint job. Finally, make sure you choose a an excellent brush and also rollers; spending an extra dollar or 2 on this will have just together much impact on your finish as the quality of the repaint itself.