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Learn From Expert’s Guide: How to Measure Kitchen Sink (+How to Install)

Looking to learn how to measure kitchen sink to replace your existing sink but have no idea how to go about it? Then you’ve come to the perfect place.

There is a lot you must take into consideration before replacing the old kitchen sink.

And that’s precisely what we’ll cover in this article. By the time you’re done, you’ll have accurate measurements for the new sink.

Take as much time as needed for this job. Getting the wrong measurements will only lead to unwanted results in the long run. With that being said, let’s jump right into it.

What to Consider Before Installing a Kitchen Sink

When picking a sink for your kitchen, there are a couple of things you should keep in mind to avoid making a mistake.

Down below, you’ll find everything you need before installing the sink:

Keep The Radius At The Corner

Ever noticed those cute little corners on your sink? They look pretty cool, but that’s not their primary purpose.

In fact, they’re just there to prevent the chances of a break in the Formica. If you get rid of them, you could damage the Formica.

However, this is something you only need to keep in mind if you’re cutting out a countertop.

The Dimensions

If there’s a common mistake that we’ve seen people make from time to time, that’d be not taking into account the sink’s outer dimension.

But why is it a big deal? If you plan to install an overmount sink, you want the sink’s outer dimension to be larger than the actual counter opening.

If you don’t take this into account, the sink won’t cover everything around the perimeter.

The Material

Another thing most people seem to forget about is the material. All materials have different thicknesses.

This means that switching from stainless steel to porcelain can lead to some weird results.

Sometimes you might be able to get away with it.

For example, if you plan on re-using the existing cutout, you could choose a sink with similar measurements, and it might work.

Some materials are more forgiving, and others not so much.

The Sink Shape

It’s always easy to assume that any kitchen sink should be compatible with your cabinet.

But as we’ve seen so far, there are quite a few things you should keep in mind before getting one.

Another factor that you should consider is the shape of the sink. Most people have a rectangular shape sink.

But if you’re one of those folks who have a sink with curves on the bowls, you might only be able to replace it with the exact same design.

It’s pretty hard to replace one of those as they are not as common, and most of the time, the only way to replace them is by getting a sink from the same manufacturer.

Importance of Measuring Well Before Installing

Feeling as though you don’t need to learn how to measure kitchen sink before installing one? Well, here a couple of reasons that might change your mind:

Easier Fitting

Paying attention to the measurements will determine whether you end up with a gorgeous kitchen sink or one that won’t fit into the existing cutout.

Some people tend to skip this step as they have an old sink, which they often cannot remove.

A great way to get around is to simply find the old spec sheet from the original kitchen sink. This way, you can match the existing sink.

Otherwise, grab the measuring tape and measure the cabinet’s interior from left to right, and you should be good to go.

Custom Look

Kitchen sinks come in tons of different styles, materials, and sizes. However, if you get the wrong measurements, you will have a weird looking kitchen sink.

For example, the counter could hangover into the sink, or the edges could be exposed, which can ruin your kitchen’s aesthetic.

Corner Radius On Each Corner Of The Cutout

You must take enough time to measure the corner radius on each corner of the cutout.

For example, if the sink you plan on getting has a smaller lip than the old one, there is a high chance that the new kitchen sink will not cover the entire cutout.

How to Measure Kitchen Sink – 5 Steps to Follow

Measuring a kitchen sink is probably one of the most straightforward jobs out there.

Anybody can measure their own kitchen sink with the proper instructions. That said, follow these simple five steps to determine your sink’s size:

1. Measure The Sink Base Cabinet

The first step to getting measurements for kitchen sink is finding out how wide the cabinet’s interior is.

For this, you need to measure the interior width of the cabinet.

You need to measure the interior from left to right. Once you’ve gotten that number, please write it down.

2. Subtract Half An Inch

Now that you know how broad the interior is, you need to subtract half an inch from the number you previously got.

With this formula, you’ll be able to determine the maximum external sink size.

3. Measure The Length And With Of The Sink

Next, you want to get the old sink’s width and length before getting a new one. For this, start the measurement at the hook.

You might want to burn an inch to get accurate measurements.

However, keep in mind that you must subtract an inch from the final measurement if you go with this method.

Now, write down all the numbers you got for the width and length of the sink.

4. Measure The Depth Of The Sink

Now that you have the width and length, measure the depth of the sink. Just like before, you might have to burn an inch to get perfect measurements.

5. Remove The Faucet, Drain, And Sink

So far, you’ve got the measurements for the width, length, depth, and the sink base cabinet.

But now, you have to get the size for the cutout. For this, remove the faucet and the drain from the sink. After that, get the sink out of the countertop.

With that out the way, measure the width and length of the cutout.

This is the best way to measure kitchen sink.

Any sink you plan on getting should be larger than the size of the cutout. Otherwise, it won’t cover the whole area.

How to Install a Kitchen Sink

Now that you’ve measured the kitchen sink to ensure that it fits in the same space, it’s time to install the new one.

1. What You Will Need

For this job, here is what you need:

  • A bucket—always use a container when installing a kitchen sink. Supply lines always hold water when removing them.
  • A putty knife—if the countertop is laminate, we suggest using a putty knife to get it off of the surface.
  • A screwdriver and hammer—you might need these tools to remove the garbage disposal if it’s not coming off.
  • Plumbers putty—use this substance to make a watertight seal on the drain.
  • Silicone sealant—to attach the sink to the countertop, use silicone sealant.
  • A garbage disposal key—use the wrench to remove the garbage disposal from the kitchen sink.

2. Shut Off The Water

First and foremost, turn off the water, and then turn on the faucet to release the pressure. After that, please turn off the power to the disposal and then plug it off.

Next, disconnect the supply lines. Before removing the supply lines, we suggest using a bucket to catch any water.

Once you’ve disconnected them, remove the drain pipes. Next, use a screwdriver to unscrew the discharge pipe.

It tends to get real jammed on there, so you might have to apply more strength than usual to remove it.

The garbage disposal should now come right off.

But if it doesn’t, get a screwdriver in there and then hit it with a hammer. After that, use the garbage disposal key to remove it.

3. Loosen The Metal Clips

Now, you have to remove the clips on the bottom. For this, you have to use a screwdriver.

You could now push the sink right up, but chances are it is attached to the countertop.

So, to lift it up, you’ll need to use the putty knife. Get it underneath, and try to release any adhesive you find. After that, gently push it from underneath.

4. Install The New Sink

Now that you’ve removed the sink put the new sink on a working table, and wrap a bead of plumbers putty around the drain strainer.

Once you’ve set the sealant around the drain strainer, press it into the sink.

From there, place both the gaskets and flange and then install the mounting bracket.

When you’ve installed them, you might notice that putty is coming out of the drain strainer. Go ahead and wipe it off.

With that out of the way, install the faucet and the clips on the bottom.

Once you’ve installed the clips, please run a bead of silicone sealant all over the sink edge, and then put the sink into the existing hole. Once again, wipe off any excess sealant.

5. Connect The Connections

Once you’ve installed the new sink, hook up the supply lines to the faucet. Next, connect all the connections and the sprayer.

From there, connect the disposal to the new sink and then install the discharge pipe.

Keep in mind that sometimes the new drainpipes might not fit into the new sink.

So, you might have to do a little bit of tweaking before you can get them in.

Now that you’ve installed pretty much everything, go ahead and install the P-trap and then plug the garbage disposal into the outlet.

Next, turn on the water. As soon as you turn it on, get underneath and make sure water is not coming out.

If you notice any leak, you might have to tighten the connections.

And that’s it for the installation. If you’d rather watch a video for this job, we suggest giving this one a try:

Frequently Asked Questions (FAQs)

Here is some useful information about the kitchen sink:

How do you measure kitchen sink size?

To accurately measure a kitchen sink, follow the following steps:

  • Measure the width, length, and depth of the kitchen sink
  • Remove both the faucet and drain from the sink
  • Measure both the width and length of the cutout
  • Now measure the sink base cabinet

What is the standard size for a kitchen sink?

The standard kitchen sink measurements can be anywhere from 27 inches to 30 inches.

But you can always go any further if needed. Some people have a 33-inch sink, and others have a smaller one.

As long as it fits into the existing hole, there’s nothing wrong with it.

Does the kitchen sink have to be under a window?

No, the kitchen sink does not have to be under the window.

There is nothing wrong with that, but it’s not a requirement.

Traditionally speaking, they were there for anybody who wanted to look out to the back yard.

Do you need a plumber to install a kitchen sink?

No, you don’t need a plumber for this job. Replacing the kitchen sink is not as hard as it might seem, and you can get it done within 30 minutes.


As you know by now, learning how to measure kitchen sink is pretty simple, and it does not take much time.

Perhaps the biggest obstacle you might encounter is removing both the faucet and the drain, but that’s about it.

As soon as you get those obstacles out of the way, you should be fine.

Besides that, you also have to keep in mind all the numerous factors we covered throughout the article.

Following through with all those points discussed should allow you to correctly pick up and install the right sink for your kitchen.