How To Measure an Undermount Kitchen Sink Properly

As an Amazon Associate I earn from qualifying purchases. Learn more.

Need to measure your undermount sink for a perfect fit?

You’ve come to the right place!

Whether you’re installing an undermount kitchen sink for the first time or are replacing your old one, having precise measurements is extremely important.

Undermount sinks usually need more support than drop-in models, so it’s crucial to know whether the size of your sink is compatible with the cabinet and countertop space available. Keep reading to learn how to measure an undermount kitchen sink properly!

What’s In This Guide

In this guide, we provide you with a proven 6-step method to measure an undermount kitchen sink. We also list down the list of supplies, materials, and tools you’ll need for precise measurement.

Finally, we answer some of the most commonly asked questions about measuring an undermount kitchen sink.

Hopefully, this guide will sort out all your confusion. However, if you still have a question about how to measure an undermount kitchen sink properly, please leave us a comment below!

The Process

Measuring an undermount kitchen sink is an extremely easy task and will only take a couple of minutes.

The following dimensions need to be taken in order to describe an undermount sink completely:

  1. length
  2. width
  3. depth
  4. sink lip
  5. length and width of countertop hole
  6. cabinet opening width

Get Prepared: What You’ll Need

You need to use the right tools to measure the dimensions of any object.

For this task, you’ll need the following supplies:

  • Measurement tape
  • A pencil and paper

Step 1: Length

How To Measure Undermount Sink

Place the measurement tape along the length of the kitchen sink. Make sure you measure from the left to the right edge and cover the entire length of your sink. It’s advisable to write down all the measurements for further use.

Step 2: Width

How To Measure Undermount Sink

Place the measurement tape at the back edge of the sink and drag it to the front to measure the width. Make sure you align the tape with the kitchen faucet and extend it across the basin to the edge where you’re standing.  

Step 3: Depth

Extend the measurement sink from the top edge of the sink to the bottom of the basin.

Step 4: Sink Lip

Since undermount kitchen sinks hang under the counter, you won’t be able to see the sink lip. So, you’ll have to remove the sink from the countertop in order to measure this dimension.

The sink lip is the distance from the edge of the sink to the visible edge of your kitchen countertop. Although most sink lips measure one inch in diameter, it’s still a good idea to take the measurement yourself.

Step 5: Length and Width of Countertop Hole

How To Install Undermount Sink

This step is important if you want to replace your old undermount kitchen sink with a new one. Make sure you turn off the water valves and disconnect the drain line before you remove your old sink.

Once you’ve removed your kitchen sink, measure the length and width of the countertop hole.

Step 6: Cabinet Opening Width

How To Measure Undermount Sink

If you have a cabinet underneath your countertop, you need to measure its width before you buy a new kitchen sink. Crawl under the counter, and place the measurement tape at the top left corner and extend it to the top right corner.

Any sink wider than the cabinet opening width will not be a good fit.

Frequently-Asked Questions About Measuring an Undermount Kitchen Sink

How to measure oval and round sinks?

Measuring an oval or round sink is a bit more difficult. You’ll have to measure the unit’s diameters instead of the length and width.

Make sure you measure the diameter (both lengthwise and widthwise in the case of an oval sink) and then cut a hole in the cabinet or the countertop accordingly.

What are the most common sizes of undermount kitchen sinks?

Most undermount kitchen sinks measure 30” to 33” in length, but a standard size can measure anywhere between 36” and 24” in length.

How much space does an undermount kitchen sink need?

It’s advisable to leave around three inches of space from the sink’s edge to the wall. Make sure you also leave at least one inch of space from the front of the sink to the edge of the countertop for the rim.     

24 thoughts on “How To Measure an Undermount Kitchen Sink Properly”

  1. Nevertheless, minority that take the flexible price lendings go through pay higher or reduced rates of interest each quarter on the lending.

  2. Heya i am for the first time here. I came across
    this board and I find It really useful & it helped me out a lot.

    I hope to give something back and help others like
    you helped me.

  3. I don’t even know how I ended up here, but I thought this post was good. I don’t know who you are but certainly you are going to a famous blogger if you are not already 😉 Cheers!

  4. I think this is one of the most important info for me. And i’m glad reading your article. But wanna remark on some general things, The web site style is great, the articles is really great : D. Good job, cheers| а

  5. Hi I am so happy I found your webpage, I really found you by error,
    while I was researching on Askjeeve for something else, Regardless I am here now and would just like to say kudos for a
    remarkable post and a all round enjoyable blog (I also love the
    theme/design), I don’t have time to browse it
    all at the moment but I have bookmarked it and also added your RSS feeds, so when I have time I will be back to read more, Please do keep up
    the awesome b.

  6. Thanks for your personal marvelous posting! I definitely enjoyed reading it, you
    could be a great author. I will remember to bookmark your blog and may come
    back sometime soon. I want to encourage continue your great job, have a
    nice evening!

  7. Good site you have got here.. It’s hard to find good quality writing like yours these
    days. I seriously appreciate individuals like you!
    Take care!!

  8. you are actually a just right webmaster. The site loading velocity is incredible.
    It seems that you’re doing any distinctive trick. Furthermore, The
    contents are masterpiece. you have performed a great activity on this matter!

  9. Hello! I simply wish to give you a big thumbs up for the great info you have right here on this post. I’ll be returning to your blog for more soon.


Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.