How To Measure A Bathroom Sink?

How To Measure A Bathroom Sink?

You use a tape measure to determine the height, width, and depth. Probably the most important measurement you need is the width.

Bathroom sinks vary widely in terms of width.

How to measure a bathroom sink

The bathroom sink or basin is one of the most important parts of a bathroom. Without it, you will find it difficult to wash your hands, wash your face, or brush your teeth in your bathroom. To replace your current sink, you need to know its measurements. The measurements will help you to get a replacement that will fit easily into the space now occupied by your current sink.

Read on to find out how exactly to measure a bathroom sink.

Understand the measurements

Before you do any measurements on your bathroom sink, you need to understand exactly what you need to measure. The three most important measurements you will be taking are height, width, and depth.


The height of a sink is how deep it is. This is the length from the deepest part of the sink to where it meets the counter. It is not always the easiest thing to measure but it is important to measure. You should not get a sink that is much taller than what you have. This will make it difficult for you to set it up.


The width of a sink is a measure of how wide it is. To measure the width of a sink, you need to measure the distance from one end to the other. The average bathroom sink width is 22 inches. 


The depth of a sink should not be confused with its height. The depth of a sink is how long it is from the back to the front. In other words, what’s the distance between the end of the sink next to the faucet and the end next to you.

How exactly to measure a bathroom sink

Now that you know the important bathroom measurements, it is time to discover how exactly to measure a bathroom sink. 

  1. The first step is to thoroughly clean and dry the sink surface to get perfect measurements. Needless to say but the sink musts also have nothing inside it or around that can affect measurements.
  2. Measure the length of the edges. The most important measurement is the depth of the sink and the other measurement is the width of the sink. 
  3. Measure the height of the sink. The height of the sink as explained in the section above is how deep it is. When measuring the height of the sink you are not supposed to include the height of the faucet. 

With the above measurements, you have enough to order a new sink that will perfectly fit your current sink. 

How to replace a bathroom sink

If you read the above, section you wanted to know how to measure a bathroom sink. If you wanted to know how to measure a bathroom sink, it is probably because you want to replace it. In this section, you will learn how to replace a bathroom sink. 

  1. Measure everything important 

To replace a bathroom sink, the first thing you need to do is to measure everything. Take all its important measurements. These will help you to get a replacement that fits in the space occupied by your current sink. 

  1. Purchase a new bathroom sink 

Once you take the important measurements of your current sink, you should order a new sink using the measurements. You can order the sink online or visit your nearest home improvement store. It is much better to visit a home improvement store and sharing your measurements with an assistant and being shown the options available based on your measurements. Sometimes it gets a bit difficult to get specific things online. 

  1. Shut down your water supply 

Before you start replacing your sink you should shut down its water supply because you will have to remove the drain and the faucet during the process.

  1. Dismantle the plumbing 

After shutting down your water, you need to disconnect the plumbing from your current sink. This will involve disconnecting the P-trap and disconnecting the drain. P-trap disconnection requires you to be careful to avoid making a mess as there is usually dirty water in it. Most people put a basin under the P-trap when disconnecting it. This is what you too should do to avoid making a mess.

  1. Cut the sink out

After disconnecting the plumbing, your sink will be separate or free from everything else and ready to be removed. The removal process includes using a putty knife to cut the sealant around the sink. This will normally free the sink and all you will have to do is to lift it out. If your sink is not yet free, look for clips underneath it and remove them to free your old sink. 

  1. Apply sealant to the new sink 

At this stage, it is now time to install the new sink. You should begin with applying silicone sealant to its edges as instructed by the manufacturer. After applying the sealant, you should put the sink in. Wipeout any excess sealant that seeps out. 

  1. Connect your new sink 

Upon setting your new sink, you should start to connect it. Connect the drain and the P-trap and then connect the faucet and the water supply. Remember to caulk every connection to prevent leaking. 

  1. Test and use your new sink 

Once you reconnect everything, your mission is successful. You have replaced your old sink with a new one and the new one is ready to use.

How do you measure an undermount bathroom sink?

Place your straightedge ruler or your level across the top of your sink. Use your tape measure to measure the deepest part of your sink basin to the bottom edge of the ruler. Write down the depth. If you have an undermount sink, be sure to measure the height from the sink to the countertop.

How far should a bathroom sink be from the edge of the counter?

The NKBA suggests that the minimum space between the sinks’ centerlines within a vanity should be 36 inches. The depth requirements for double sinks are the same as those for single sinks. Two inches are always left between the front edge of the sink and the front edge of the countertop.

Are our bathroom sink holes standard size?

While a bathroom sink’s design and overall size may vary from one model to the next, the drain holes are fairly standard, 1.25 inches being a general standard, with widths of 1.5 inches and 1.625 inches also common. The size of the hole helps determine which size drain is needed for that particular sink.

How To Measure A Bathroom Sink – Related Questions

What shape bathroom sink is best?

Square Bathroom Sink | Pinterest

If you want to create a more unique bathroom space, a square sink is definitely a risk that can pay off. But, if you are looking for a more traditional look, an oval sink might be best. To complete the appearance and aesthetic of your bathroom, pair your new basin with a natural stone surface.

What is a standard sink size?

The most common sizes for a kitchen sink are 30″ or 33″, however, a standard size could measure anywhere between 24″ and 36″ in length. The bulk of what you find while shopping will fall within this size range. Generally, sinks up to 30″ will contain one large single bowl.

Are all bathroom sink drains the same size?

While a bathroom sink’s design and overall size may vary from one model to the next, the drain holes are fairly standard, 1.25 inches being a general standard.

What size sink fits in a 24-inch vanity?

A 36″ base cabinet can handle a 33″ sink at most; a 30″ cabinet should be fitted with a sink no larger than 27″ wide. The average 24″ sink base cabinet comfortably accommodates a standard 22″x30″ sink; be sure to consider the depth of your sink when planning storage inside the base cabinet.

How close can the sink be to the wall?

The building code allows for a minimum of 21″. The bathroom lavatory, or sink, should be placed far enough from a wall or shower wall that it’s comfortable to use and easy to clean. The NKBA recommends 20″ measuring from the center of the lavatory to the wall.

What is the best depth for a bathroom sink?

If a bathroom sink is too shallow, splashing is more frequent and you won’t be able to fill the sink for any reason. Another reason for these heights is accessibility. Five to eight inches seems to be the most accessible depth for everybody.

How much space should be between the countertop and sink?

The sink should have a minimum of 24 inches of landing area on one side, and a minimum of 18 inches of landing area on the other side. Countertop Prep Area: In addition to landing area minimums, it is highly recommended that at least a continuous 36 inches of countertop be located directly next to the sink.

Do all bathroom sinks have 3 holes?

Sinks generally come in one of three configurations: 6”, 8”, and 6”-16”. The faucet will cover the holes in most of this configuration. You will need to measure the width between the outer holes or estimate it by measuring the width of the deck plate. A 3-hole sink is very common in bathrooms.

What is the difference between a top-mount and an under-mount sink?

What is an under-mount sink? While a top-mount sink sits jovially above the benchtop, an undermount sink is holding on for dear life underneath the countertop.

How do you measure a sink grid?

Using a tape measure, begin at the bottom of the sink walls just above where the walls start to curve inward toward the drain. Measure the width side to side from that point to the mirroring point on the other side of the sink. Repeat the same steps to measure the depth, front to back. You now have the width and depth.

What is the easiest bathroom sink to keep clean?

Pick a sink made of quick-cleaning materials like porcelain, tempered glass, or vitreous china. These three are the most convenient options in terms of maintenance. Metal sinks are popular, particularly stainless steel.

What type of bathroom sink is easiest to clean?

Bathroom sinks made from a clay-based ceramic material such as vitreous china, fireclay, and porcelain are common and easy to clean. Metal sinks, including brass, copper, and stainless steel varieties, are durable choices.

Which is better round or square sink?

While the around sink may have a classic look, a rectangular sink looks a lot more modern. If you’re going for a stylish design, it may be a better fit.

Is a 10 inch sink too deep?

Going Deep

Most kitchen sinks vary from 8 to 10 inches in depth. While a sink with a 10-inch depth makes it easier to soak pots and pans, deeper sinks can be more uncomfortable for shorter family members to use. Shallow sinks allow for easier reaching and prep work.

Will a 30-inch sink fit in a 30-inch cabinet?

With the 30-inch base cabinet, not all sinks can fit into it. Sinks come in all shapes, and different sizes thus chose wisely. Always the rule is that, take the Size of the base cabinet and subtract by 3 inches. It means, therefore, the Size of the Sink you require is 27 inches.

What is the standard size of a bathroom sink cabinet?

Standard widths for vanity cabinets are 24″, 30″, 36″, 48″, 60″ and 72″, however, you may find some in-between sizes out there. The standard depth of vanity, from front to back, is typically between 20″-21″. However, there are narrow depth options available which are usually 18”.

Is an overflow required on a sink?

We researched this to get you the very best answer! No, bathroom sinks do not necessarily need an overflow valve. The overflow serves two purposes, it diverts water back to the drain pipe and improves drainage speed.

How do you measure a sink tailpiece?

Measure from the wall where the house drain pipe is to the nut securing the J trap to the sink drain pipe with a tape measure. Add two inches to the measurement and write it down on a piece of paper. This is the measurement for the rear sink drain pipe.

How big is a small bathroom sink?

Small bathrooms usually call for small bathroom sinks, but small sinks can pack a powerful punch. Most standard round sinks measure 16 to 20 inches in diameter, while most rectangular sinks range from widths of 19 to 24 inches and 16 to 23 inches front to back. The typical basin depth is 5 to 8 inches.

What are the measurements of a standard bathroom?

A full bathroom usually requires a minimum of 36 to 40 square feet. A 5′ x 8′ is the most common dimension of a guest bathroom or a master bathroom in a small house. If you happen to have this standard-sized small bathroom, there are two different layouts you can consider.

What is the standard height of a bathroom sink?

The standard height of a bathroom sink, in general, ranges from 29 inches to 36 inches. A few examples that may help you determine what is the best fit for your lifestyle include:

Bathroom sinks built into pedestal cabinets are typically between 29 and 33 inches high. These types of bathroom sinks and cabinets can be installed at any height, within this range, according to individual desires and bathroom decorating preferences.

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