How to Measure For a New Kitchen Sink
It takes just four simple steps.
Before you go buying a new kitchen sink, you need to make sure it's going to fit. The first step is to measure the size of your current sink, as well as any remaining space you have to work with. So, grab a tape measure and read our guide to taking these easy steps to measuring a kitchen sink
Before You Measure
Since each kitchen sink is measured differently, it's important to know exactly what type of sink you currently have. For more information on these types, read our guide: Need Help Choosing Your Next Kitchen Sink?.
How to Measure A Kitchen Sink
Whether you're replacing an old sink with the same installation type or looking for a new style, you should:
- Determine your project scope.
- Measure your current kitchen sink's width and length.
- Measure available counter and cabinet width and length.
- Measure sink depth and kitchen cabinet depth.
For more in-depth information on how to approach these four steps, keep reading.
What You'll Need
- Pencil
- Paper
- Tape measure
- Level
Step 1: Determine Your Project Scope
Are you replacing a kitchen sink with the same installation type you currently have or are you trying a new style? Knowing this will determine how you measure your kitchen sink.
If you're replacing an existing sink with the same installation type, simply measure the length, width and depth of your current sink and choose a replacement with the same measurements. That's it, easy. However, if you're choosing a new sink installation type, follow the three steps below.
Step 2: Measure Your Current Sink
Measure the length and width of your countertop's existing cutout along with the depth of your old sink. If you currently have an inset sink (aka drop-in sink), you may need to go into the cupboard underneath the sink to measure the opening from below. Measuring the inset sink's basin from above won't accurately show how big the countertop opening is. Your replacement sink should be no deeper, wider or longer than these measurements. If you'd like a deeper sink, skip to step 4.
Your under-cabinet and kitchen countertop space will determine how big your new sink can be. To find your countertop's usable surface space, measure from the front edge of your countertop to the wall, accounting for the thickness of any backsplash. This is the widest your new sink can be. However, if you use up all available space, you will need to use wall-mounted faucets which will include making new holes in your wall and moving plumbing lines. To make this more DIY friendly, we recommend measuring the base of your kitchen tap and dedicating that amount of countertop space for tap holes and the rim of an inset sink (if you choose this as a new style). If you're measuring for a Belfast / butler sink style, remember that it's okay for this style to jut out slightly from the face of your kitchen counter.
Next, you'll need to find the interior length of the cupboard space underneath. Go into your cupboard and measure from left to right (side to side), then subtract three to four inches from the total length to account for sink-mounting hardware needed on either side. To ensure your cupboard can accommodate your new sink, this measurement should be no less than the 'Minimum Base Cabinet Width' listed under the sink's specifications.
Step 4: Measure Sink Depth and Cabinet Depth
Lay a level or straightedge across the top of your sink. Measure from the deepest part of your sink to where the measuring tape and straightedge meet. Most sinks do not have a flat bottom to allow for better drainage, which is why it's important to note the deepest part of your sink. Remember that a new undermount sink will be slightly deeper than the product's labeled depth as there will be an inch or two of countertop above it.
If you want a deeper sink than you have now, make sure to check under your cupboard to ensure the new sink you want clears any structural elements or immovable objects – such as plumbing pipes, electrical connections and garbage disposals – and offers enough clearance for drain assembly. When measuring for a Belfast / butler sink, which sits flush with the surrounding cabinets, you'll need to measure the distance between the top of your counter and the top of the cupboard doors beneath it. This measurement will dictate the maximum depth your sink can be.
Tip: If you're interested in buying a kitchen sink grid to help protect the bottom of your sink, measure the width and length of the sink's basin. Your sink grid should be the same size or close to the size of your sink to ensure it protects the basin. While taking measurements, take into account the curve of the basin's edges. This will also affect the shape of the grid you choose.
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