Bathroom Sink Measurements

A Complete Guide to Measuring for Your New Bathroom Sink

Installing a new bathroom sink is a relatively easy way to update the look of your space. But before you purchase a stylish new sink, it’s crucial to take accurate measurements of your vanity or sink base. This will ensure you select the perfect-sized basin and faucet to fit in your existing bath layout.

As someone who has made the frustrating mistake of buying a sink online that didn’t fit my bathroom vanity, let me walk you through the complete process of measuring for a new sink. Follow these steps and tips to get the right bathroom sink size and dimensions for your needs.

Measure Your Existing Vanity or Sink Base

Start by measuring the length, depth, and height of the existing cabinetry or vanity where your new sink will be installed. This gives you the maximum dimensions to work within.

Length is side to side and depth is front to back. For height, measure from the floor to the top of the vanity or counter. Record your cabinet dimensions and have them handy for reference when shopping for sinks.

Consider Vessel or Drop-In Sink

Decide if you want an undermount, vessel, or drop-in style bathroom sink. Vessel sinks sit on top of the vanity surface. These come in a wider range of sizes, as you don’t need to factor in a vanity cut-out.

Drop-in sinks require cutting a hole in the counter or vanity top. Undermount sinks sit below the counter surface. All install a bit differently, so factor this into your measurements.

Measure Faucet Holes

Take note of the current number and placement of any faucet holes in your existing sink or countertop. This will determine what faucet configurations you can use with a new sink.

If there are no pre-drilled faucet holes, this gives you flexibility to choose any faucet spread you want. Just make sure to account for drilling new holes during installation.

Leave Room for Faucets and Extras

When measuring for a new sink, leave a bit of extra room on all sides to accommodate any faucets, backsplashes, countertop overhangs, or potential tile trim.

For example, a widespread faucet needs clearance on either side of the sink. A wall-mount faucet can limit your available length. Make sure to measure your current or planned faucet dimensions.

Consider Cabinet Storage Needs

If your sink will be installed in a vanity, measure the existing storage situation. Is there a bank of drawers or just an open cabinet? Make sure your new sink size allows for optimal use of the vanity storage space.

You may want to choose a compact sink to allow room for drawers or shelving underneath. This is especially key in small bathrooms with minimal cabinet storage.

Standard Sink Size Dimensions

Once you have your measurements, it’s helpful to know standard modern sink sizes:

  • Small bath sinks: 14” to 17” wide
  • Standard single sinks: 20” to 24” wide
  • Oversized single sinks: 25” to 30”+ wide
  • Double sinks: 25” to 60”+ wide

Depths for most sinks range from 14” to 23”. Vessel sinks can be much shallower. Of course, always verify the dimensions for any sink model you’re considering rather than relying on standard sizes alone.

Make a Scale Drawing

To visualize how a specific sink will fit in your space, make a simple scale drawing of your vanity area and mark the sink dimensions. This lets you see if it will look well-balanced or be too large.

Leave a 1-2” gap on all sides between the sink and vanity edges so you have wiggle room during installation. This helps avoid any frustrating size issues.

Allow for Overflow and Backsplash

When determining what sink size your bathroom can accommodate, account for extras like:

  • Faucet overhang in front
  • Backsplash depth behind
  • Side cabinet overhang allowance
  • Room for sink bowl overflow lip

Mapping these out on your scale drawing is useful and prevents surprises later on.

With these measurements and tips, you can shop for bathroom sinks with confidence, knowing what dimensions will work for your space. Always double check any sink specs before purchasing. 

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