Faucetsreviewed is audience-supported. When you buy through links on this site, we may earn an affiliate commission that we use for site maintenance. Learn more


6 Steps to Measuring Undermount, Round & Oval Kitchen Sinks: Simplified by Our Experts!

how to measure a kitchen sink
Written by Callum Strempel

A mismatched kitchen sink with the countertop looks awful and comes with many inconveniences. You can avoid such an unpleasant experience if you know how to measure a kitchen sink accurately. Before feeling overwhelmed by the variety of beautiful kitchen sinks available at the marketplace, you need to know the size that is compatible with your countertop and cabinet. You must use proper techniques to ensure the precise calculation of the sink dimensions. Read on to learn how to measure for a kitchen sink.

Why Measuring a Kitchen Sink Is Important?

You may basically need to measure a kitchen sink for two reasons – when you are replacing the current sink and when you are setting up a kitchen sink for the first time. In both cases,kitchen sink sizes significantly matter as the wrong-sized sink will create more nuisance instead of minimizing it.

At first, know the available space you have to place the sink. Determine the size of your countertop and decide which type of sink you are going to buy. Once you have ideas about the space of your kitchen and the apparent size of your sink, delve into the next steps of measuring a kitchen sink.

How to Measure a Kitchen Sink?

There are many variants of kitchen sink in terms of their shapes, sizes, and locations of the sink. Most of today’s kitchen sinks come in a rectangular shape and are placed on a countertop being associated with a cabinet sometimes. In the initial stage, you have to arrange the things you need to measure the sink.

1. Gather the Supplies

The right measurement largely depends on the use of the right essentials while calculating the dimensions of any tangible object. You may need the following list of supplies. Gather them ahead of the measurement.

  • Pencil and paper
  • Measurement tape
  • Straightedge Ruler (36”)

2. Measuring Your Sink and Countertop

When you are done with the arrangement of the necessary tools to measure kitchen sink, go on measuring the countertop and the sink carefully, pay meticulous attention to the detail as you may need to cut the countertop to adjust the size of the sinks. Once you cut the countertop, it will be a great hassle to readjust the sizes. So, look before you leap.

  • The Length

Measure a Kitchen Sink
Place a measurement tape along with the length of the sink. Ensure that you are measuring from left to right edge covering the entire length of the sink. Note down the measurement for further uses. This is the first step to learning how to measure for a new kitchen sink.

  • The Width

Measure a Undermount Kitchen Sink
Lay the tape measure from back to the front edge of the sink and measure the width. Place the tape at the edge of the sink where the kitchen sink faucet is and extend the tape across the basin to the edge where you are standing. Keep the record of the measurement.

  • The Depth

Use a straightedge ruler as before. Place it right at the top edge of the sink then extend it to the bottom of the basin. Take proper note of the distance.Kitchen sink depth measurement is essential as it will determine how fast the sink water gets drained down.

  • The Sink Lip

Any kitchen sink other than an undermount style has a sink lip. This is the distance from the visible edge of the countertop to the edge of the sink. The average length of a sink lip measures 1-inch. It may be different regarding your sink, keep a note of the sink lip measurement.

  • The Length & Width of Countertop Hole

This step is suitable for you if you opt to replace your old sink with a new one. You need to remove the old sink at first before placing the new one. Make sure that you have unplugged the water valves, disconnected the drain line, and taken help from a friend or someone else when lifting the old sink.

Now, the countertop hole will get exposed to you. Measure the length and width of the sink cutout. Keep these measurements in a secured place so that you can use them right at the moment when needed.

  • The Cabinet Opening Width

Sometimes, the kitchen sink accompanies a cabinet under the countertop. If you have a cabinet opening that supports the sink, you have a more dimension to calculate. Crawl underneath the countertop and lay the measurement tape from the top left corner of the cabinet to the top right corner. Take these sizes into account when buying a new sink. A sink any wider than that won’t fit well in the cabinet.

How to Measure a Undermount Kitchen Sink?

Undermount sinks are different than the other types of sinks as they hang under the counter. You will not see any sink lip if the sink is set in undermount style. As the placement of the sink is different from the conventional ones, you have to consider it, especially while measuring for an undermount kitchen sink.

You should measure these sinks after removing them from the countertop. Besides, there will be no faucet attached to the sink. The faucet remains separately on the counter. So, you have to keep ample space for the faucet when you are planning to set up a new undermount kitchen sink so that you can use them in the right way and keep the sink as well as sink faucet clean.

How to Measure Round and Oval Sinks?

Measuring a round or oval sink comes with more significant challenges. You have to measure the diameters instead of taking the record of length and width. Measure the diameter both lengthwise and widthwise to get precision in the sizes. Cut the countertop or the cabinet accordingly so that these sinks easily fit in the kitchen.
Some kitchen sinks seem oval and round from an external view, but the part attached to the countertop may still be rectangular. Be careful about those sinks. You don’t have to measure the diameters of those sinks; the length and width of the rectangular frame will do well in this regard.

Elkay Quartz Classic ELGRU13322BK0 Black Single Bowl Undermount Sink
  • Sink Dimensions: 33" X 18-7/16" X 9-7/16" Min. Cabinet Size: 36"
  • UNDERMOUNT INSTALLATION: Sink is installed beneath the countertop creating a seamless appearance between the sink and the countertop.
  • SINGLE BOWL: Bowl gives you uninterrupted space for washing and stacking dishes or other household tasks.
  • EASY TO CLEAN & STAIN RESISTANT: Coordinate your sink color with your décor and style; washes clean with soapy water; food and liquid won't stain.
  • IMPACT, HEAT & SCRATCH RESISTANT: Molded from fine quartz sand to resist banging, chipping and scratches; heat safe up to 535° Fahrenheit.

Standard Dimensions of a Kitchen Sink

The standard dimensions of a kitchen sink range from 22 inches wide to 30 inches long.  A Two- or three-inch deviation from this range is also considered as the standard size. This size is suitable for the rectangular shaped kitchen sink. Round and oval sinks range from 16 to 20 inches in diameter. Most of the kitchen sinks are 8-10 inches deep on an average.
There are differences in single bowl kitchen sink sizes and double bowl kitchen sink sizes. A single bowl kitchen sink can get as wide as 33 inches and double bowl sinks can go up to 48 inches. Triple bowl units often reach 60 inches in width. So, the dimension varies in terms of the types of the kitchen sink.

To conclude, you must keep a few things in mind before purchasing a kitchen sink and keeping it well-maintained. Make sure that your sink doesn’t seem too large or small in your kitchen room with respect to the proportion. Choose the right size that is compatible with the room size. Consider the space in the countertop and cabinet too. Also, make sure that the sink fits well in the base cabinet and counter. To do that, you must know how to measure a kitchen sink properly. This article will be of great help in this regard.

About the author

Callum Strempel

Licensed Plumber

Hi, I’m Callum, a full time plumber with a plumbing license issued by my state. So far, I’ve spent nearly a decade and a half installing and fixing a wide variety of plumbing components and units. My profession inspires me to talk about the kitchen and bathroom (and the plumbing system) so confidently and knowledgeably that I offer my free consultations to help neighbors and fellow homeowners every now and then. As I enjoy installing faucets, sinks, showers, and fixtures, I love to see people enjoying services from those components for years to come. So, I write every week to inform you and others. Will you mind going through some of my articles on this website?

Leave a Comment