Calculate how much paint and primer you need by start the dimensions of your room below. Optionally, encompass ceiling paint in your estimate.

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How to calculate Paint and Primer

When you’re paint a room you could be wonder how countless gallons of paint you’ll in reality need. There room a couple of methods to figure this out.

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


Simply go into the size of your room, and the calculator finds the square clip of the walls, then approximates the paint and also primer needed for that area.

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


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The first step is come calculate exactly how much repaint you need. This is most likely the most costly material and also is frequently not returnable if girlfriend order as well much, so obtaining it ideal is important.

By far, the easiest way to estimate how plenty of gallons of paint you need for a project is to consult the quick reference table below.

Paint Coverage Estimates

This table shows the estimated amount the paint required for average-sized rooms.

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

Amount that paint necessary to cover the typical sized room, utilizing a standard 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 also easy, yet the most accurate method of calculating paint and also primer for a job is to measure up the surface to be painted and use the coverage calculation for the details product you’re using.

Step One: measure up the Walls

The first step in estimating paint material is to measure up the wall surfaces or ceilings you will certainly be covering. Measure up the length and height that each wall in feet and also write them down. It may be simplest to round approximately the next foot measure up for measurements that save on computer partial feet.

Step Two: calculate Square footage of every Surface

The following step in the process is to calculation the square clip of the walls and also ceilings. Square clip is one area measurement of a space, measure in feet, and also we have a basic calculator to aid with this calculations.

For each set of measurements from step one, multiply the width and height with each other to acquire the square footage. Make certain your measurements are in feet before multiplying. Create down the square clip of each wall.


For example, let’s find the square footage 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 find the area of complex wall shapes.


For walls that have large banks of doors or windows, consider subtracting the area the those indigenous the wall surface square clip to protect against ordering too lot paint. To carry out that, measure up the length and also height of each door and home window and main point to discover the square footage. Then, subtract the door and home window square footage from the wall surface square footage to discover the area that needs paint.

If the walls room not an easy rectangles or room complex, then take into consideration breaking the wall into smaller sections and calculate the square clip of each ar individually. To illustrate this, if your wall is no a normal rectangle, break it into various sections and also measure the square clip of each section. Learn more about just how to measure up irregular walls.

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Illustration showing exactly how to break up a complicated wall shape into smaller piece to measure.Step Three: add Square Footages together to discover the Total

Once you understand the square footage of every wall, add them together to uncover the full square footage. If you had actually split complicated walls right into several surfaces then be sure to include each surface to acquire the total.


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

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


Step Four: Calculate paint Coverage

The last step is to discover the coverage proportion of her paint and also calculate the number of gallons essential to sheathe the complete square footage. Most experts use the formula of 350 come 400 square feet of wall coverage per gallon of paint and 200 square feet of wall coverage per gallon the primer.

It’s crucial to keep in mind that different types and manufacturers may cover much more or much less area. It’s also important to keep in mind that different application techniques such together spraying, rolling, or brushing will certainly cover differently.

Your paint seller should be able to tell girlfriend the coverage for her selected paint, and also it’s often indicated ~ above the container.

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


For example, let’s find the paint needed to cover 540 square feet making use of a product the covers 350 square feet every gallon.

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


How to Estimate paint for Trim

Here’s a tip: estimate the paint and primer required to sheathe trim or little surfaces by adding the dimension of the room and collection the height of the room in inches come the elevation of the trim.

You can additionally estimate trim making use of the measurement method above. Start by measure the elevation of the trim in inches, then convert that to feet. Because that example, trim the is 4 inches tall is .33 feet tall.

Then multiply the height by the size of trim to discover the square footage. Climate follow the rest of the steps above to estimate the paint required to cover that square footage.

How to calculation Exterior Paint

You have the right to estimate exterior repaint you’ll need similar to interior projects. Start by measuring each exterior wall 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 helpful to uncover the square clip of the gable.

The, include the square clip of each area together. Subtract the square clip of any doors and windows that you won’t be painting from the complete square footage.

Consult the direction on the certain product you’ll be making use of for a coverage estimate.

Keep in mind that walls v porous surface such together concrete, brick, or rough lumber will soak increase much an ext paint than a smooth surface. We imply ordering much more paint 보다 you estimate to cover these surfaces.

When do dramatic color changes you might likewise need second coat of paint to get adequate coverage; be sure to account because that this in her estimate.

Estimation Tips

It may be a an excellent idea to order 10-20% extra, probably an extra quart or gallon depending upon your project, to enable for distinctions in coverage and also to have actually extra product for touch-ups under the road. If friend are relatively close to an also gallon top top a tiny project and also want to conserve some money, consider ordering a quart for your overage.

Don’t forget come estimate other supplies needed for a paint project. Learn much more about the costs linked with a painting project.

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Be sure to seize plenty of tarps and use a an excellent blue masking tape to tape off any type of surfaces for a clean repaint job. Finally, make sure you select a good brush and also rollers; spending an extra disagreement or two on these will have actually just as much affect on your complete as the high quality of the paint itself.