How to Measure Undermount Sink Size

If you’re in the market for a new under mount sink, one of the most important things to consider is the size. Not all sinks are created equal, so it’s important to measure your space and make sure you get a sink that will fit. 

How to Measure Undermount Sink Size

In this blog post, we’ll walk you through how to measure undermount sink size, as well as some of the most common sizes. So whether you’re remodeling your kitchen or just replacing your old sink, read on for all the info you need!

Do You Measure a Sink from the inside?

When measuring an undermount sink, you should always measure from the inside of the sink. This will give you the most accurate measurement of what size sink you need to fit your space.

Start by measuring across the width at the top opening of the sink and then measure from front to back. 

Make sure to measure all parts of the sink, including the lip and corners. Also, be mindful of any faucets or fixtures that may need to fit in the same space as your sink. However, if you are installing a single-hole faucet, then you can ignore that measurement.

11 Methods on How to Measure Undermount Sink Size

1. Use a Tape Measure:

Using a tape measure is one of the most accurate ways to measure an under-mount sink. Measure the length and width of the sink opening in inches, then record the measurements. While measuring, be sure to measure from the outside edges of the sink. If possible, measure diagonally to ensure accuracy.

2. Measure Overhang Distance:

It’s important to accurately measure the overhang distance when installing an under-mount sink. This measurement will determine how far out your countertop should extend past your cabinet walls in order for your sink to hang properly. Use a tape measure to measure the distance from the edge of your sink to the wall of your cabinet. You should make sure that this measurement is equal on both sides.

Installing an Under-mount Sink

3. Measure Countertop Thickness:

Make sure you have a countertop that is thick enough for an under-mount installation. Measure the thickness of your countertop with a tape measure in order to make sure it is between 1/2″ and 1-1/4″. Measurement thicker than 1-1/4″ will require a different sink installation method. Although it should be noted that some under-mount sinks are designed to fit countertops up to 2″ thick. Make sure to check the product specifications for your sink.

4. Count Drain Holes:

An undermount sink usually requires at least one drain hole, so be sure to count how many holes are present before purchasing a new sink for installation. Drain holes should be centered in the sink and the correct size for the drain you intend to use. 

Generally speaking, a 2-inch diameter drain is suitable for most sinks, but larger or differently shaped drain holes may be needed for more specialized sinks. Make sure you know the exact size and shape of the hole before you purchase the sink to ensure a proper fit. Additionally, some drain holes may need to be drilled into the countertop before installation.

5. Check Sink Depth:

When measuring for an under-mount sink, also check the depth of the bowl in relation to the overall size of the sink itself. This will help you determine if the sink is large enough to fit your specified needs. 

Try to find a sink that is deep enough to hold all the dishes, glasses, and other items you plan on using. If the depth of the bowl is too shallow, it may not be able to accommodate your needs. Ultimately, you should choose a sink that will provide ample space for all the uses you plan on having. Keep in mind that some sinks may require special plumbing considerations for deeper bowl depths.

6. Check Basin Size:

Make sure that the basin size of the sink is suitable for your kitchen. Measure the total length and width of the bowl, including any curled edges, so that it fits properly within the existing space in your kitchen. Though a larger basin can give you more room for washing dishes and other items, it may also take up too much space in your kitchen. Consider the overall size of the sink in relation to your kitchen layout before making a purchase.

The Sink is Suitable for Your Kitchen

7. Check Drain Location:

Before installing an undermount sink, make sure to double-check where the drain location is on it. This will be important for connecting a drainage pipe to it later on during installation. Although the drain location can usually be found on the underside of the sink, it’s best to double-check so that you have no surprises when it’s time to connect the drainage pipe. If you’re unsure, contact your plumber for help.

8. Prepare Countertop:

Once you know where the drain location is and have purchased the necessary supplies to install an under mount sink, you’ll need to prepare the surface of the countertop before installing it.

This means cleaning it and checking to make sure that the surface is level. If the countertop isn’t level, you may need to use an adjustable bracket or shim to help support the sink once installed. Make sure to double-check the countertop for any cracks, chips, or other damage that could pose a problem during installation.

9. Measure Sink Rim Width:

When measuring an undermount sink, also measure its rim width in order to ensure a secure installation onto the countertop surface. Measure from one side of the rim to the other with a tape measure. While you can opt for a sink with a wide rim, narrow-rim sinks provide a cleaner look and are easier to clean.

Most rims range from 1-3 inches, but you can find some with a wide variety of widths depending on the type and style. Be sure to find a rim that is proportionate to the countertop and surrounding area.

10. Measure Drain Opening:

Measure the drain opening on top of your sink in order to make sure that it is properly sized for your installation. Use a tape measure in order to correctly measure this opening and record the measurement for future reference. If the opening is not the right size, you may need to purchase an adapter in order to fit your new sink. However, it is always best to measure and double check your measurements before making any large purchases.

Use a Tape Measure in Order to Correctly

11. Check Installation Specifications:

Before buying an undermount sink, double-check its installation specifications so you can be sure it will fit into your existing kitchen countertop space and connect properly with any drainage pipes or fixtures necessary for its operation. This will also help ensure a secure and safe installation process down the road. 

However, if you’re uncertain about any part of the installation process, it’s best to consult a professional and licensed plumber for help. Installing an undermount sink is a relatively simple task that can be completed in just a few hours. With the right tools and supplies, you can easily get your new sink up and running in no time. So take the time to make sure you have everything you need and double-check your installation specifications before getting started.

Things to Consider When Measuring Undermount Sink Size

1. Countertop Width:

The countertop needs to be wide enough to accommodate the sink, so it’s important to measure that first.

2. Cabinet Size:

Undermount sinks are typically mounted in a cabinet or shelf beneath the countertop, so it’s important to know how much space you have to work with in the cabinet.

3. Sink Depth:

It’s important to consider how deep you want your sink to be and the width and length of the sink. If you have a large amount of countertop space, you may want to opt for a deeper sink.

4. Faucet Placement:

Depending on where you plan to place your faucet, you may need to adjust the measurements for your under mount sink accordingly.

Place Your Faucet

5. Drainage Requirements:

You’ll also need to take into account how much drainage you need from your sink, as well as any other requirements related to plumbing or ventilation that could affect the size of the undermount sink you choose.

Conclusion

Measuring the size of your sink is an important part of choosing the right under-mount sink for your kitchen. You will need to take into account the countertop material, thickness, and cutout when measuring for your new sink. If you’re looking for a new under mount sink, it’s important to make sure you choose the right size. 

The first step is to measure the countertop space where you’ll be installing the sink. Once you have those measurements, you can start shopping around for a sink that will fit snugly in that space. Make sure to leave enough room on either side of the sink for faucet installation. With these tips on how to measure undermount sink size, you should be able to find an undermount sink that fits your needs perfectly!

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Terry Alexander

Hi, I am Terry. I started my professional life as a handyman and did a lot of external and internal repair of home and plumbing support. From my childhood, my passion for home repair and fixtures created an opportuinity to pursue a career in HVAC and plumbing industry. As I gained years of knowledge and my love for plumbing grew overtime, I thought to document my journey so that I could help others who ran into daily problems in their home repair. Hopefully it will help you fix those pesky home repair and plumbing problems that always seem to happen at the worst time possible!

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