Step 1. Sink Preparation

The first thing you must do before measuring a kitchen sink is determine what type of sink you have. There are a few main sink types, including drop-in sinks, undermount sinks and farmhouse sinks.

• Drop-in sinks can be referred to as top-mount or self-rimming sinks. These sinks feature a rim that rests on top of the counter surface.
• Undermount sinks will be installed below the countertop. Countertops cover the rim of the sink, meaning no part of the sink rests on the countertop.
• Farmhouse sinks have both a deep basin and exposed front. Cabinets will not cover the basin.

Once you know the type of sink in your kitchen, prepare to take measurements following these steps:

• Empty your kitchen base cabinet out so you have a clean area to measure.
• Take all your measurements more than once to ensure accuracy.
• Installation may vary based on sink type and measurement directions.

Step 2. Measure The Kitchen Sink

Let’s go over some standard sink measurements, including tips for how to measure specific types of kitchen sinks. 

• Use measuring tape or a ruler, beginning with the lip or edge that sits on the countertop.  If you have an undermount sink, then measure from the edge of the counter opening.
• Measure your sink’s length by placing the edge of your tape measure on the left edge of the sink, stretching it all the way across to the right edge.
• Write down the measured length before moving on.
• You can measure the sink width by placing the tape measure at the back edge of the sink, stretching it across the sink basin to the front edge.
• Write down the width measurement.
• To measure the basin depth, place your straightedge ruler or your level across the top of the sink. Use the tape measure to measure the deepest portion of the sink basin to the bottom edge of the ruler.
• Record the depth.

Step 3. Measure The Cabinet(s)

Once you have recorded the sink measurements, it’s time to accurately measure the cabinet space. The cabinet measurement will ultimately determine what type of sink you can install.

• Measure the depth of the cabinet first. Place the tape measure along the bottom of the cabinet and measure from the back to front edge.
• Measure the total width by placing the tape measure along the bottom of the cabinet, measuring from the left to right edge.
• Once you have the total number, subtract approximately 4 inches from the total width and 1 from the depth in order to find the sink width.
• The most common standard sink size is 24 inches from back to front.

Step 4. Remove Old Sink And Measure Cutout

Your old sink must be removed to take this set of measurements. Make sure you shut off water valves that lead to the sink and disconnect water lines, then remove the faucet. Next, disconnect the drain attachments and remove the sink.

• Measure just as you did in step 1 after the old sink is removed.
• Measure side to side, then front to back. This will determine the total width available for your new sink.
• Be mindful of your corner ratio. Make sure the corner radius and the lip of the new sink are not smaller, which means all gaps are covered.

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