How To Measure Undermount Kitchen Sink

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Not only are undermount kitchen sinks attractive and minimalistic, but they are also quite functional in their design. Because they don’t have exposed rims, they don’t catch crumbs and dirt which makes cleaning easy. But before you can get to use your undermount kitchen sink and enjoy it, you need to install it first.

Perhaps the very first step to installing an undermount sink is taking measurements. Not only must you know the right things to measure, but also know how to measure undermount kitchen sink. This way you won’t end up with a hole in your countertop bigger or smaller than the sink you have purchased.

Before you begin measurement, ensure your sink is in a stable position by placing it on a flat and stable surface. This can be a sturdy flat table or a stable workbench. Then you need to get basic measuring materials. These include:

  • Measuring tape
  • A straightedge ruler
  • Pen and paper for noting your measurements
With these instruments, you can proceed to take measurements of the length, width, and rim of the sink.

How to measure the length of the sink?

To take measurements you can take a convenient position directly in front of the sink like you were washing dishes. Then place on the end of the measuring tape on the one edge of the sink. Ensure that the tape gets to the outside rim of the sink on that side. From here, stretch the tape to the other edge of the sink. Write down this measurement.

How to measure the width of the rim? 

Standing in the same position you can measure how wide the sink is from the back to the front. Place the tap on end of the tape on the outside rim at the back of the sink. From here measure forward towards you. Note this measurement also and write it down.

Measuring the lip/rim

The “lip” of the sink refers to space in between the countertop edge and the edge sink edge. In most kitchen sinks this is usually not more than 1 inch in length.  For an undermount, it is important that you measure the width of this rim. It should be relatively the same for all four sides and variations less than 1/8 inches are insignificant. Note down this measurement as well.

Measuring and cutting out the hole

With these measurements, you can proceed to cut a hole in the countertop where you want to place the sink. To do this there is a need for some calculations. First, add the measurement of the sink lips for the left and right side. Subtract this from the length measurement you took earlier.

Repeat this same process for the width of the sink. Subtract the rim measurement for the front and back ends from the total width. This will give you the length and width of the hole you will cut. The lips of the sink will sit on top of the countertop on all four sides of the sink.

 While taking your measurement, close attention to the corner radius of the sink and hole you are about to cutout. While there is no need for an accurate calculation of this radius you should still be mindful of it. This way you don’t end up with gaps in your installation.


Note that this procedure assumes that you have bought a sink and you are cutting a new hole for installation. If it is the other way round and you are replacing an old sink, then measuring the hole first is advisable. Either way, it is important to know how to measure undermount kitchen sink in order to pick one that fits perfectly.

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