Double Vanity Spacing Calculator

A double vanity isn’t simply two sinks atop a single cabinet (though most would assume as much); it’s all about what fills the void between them; elbow collisions, towel thefts…you get the idea. We all know the importance of spacing versus style. If you are standing shoulder-to-shoulder while someone brushes their teeth and you wish they were further away or the mirror were longer, you already know the struggle.

What’s the first step? Vanity width. It’s the fixed value, the one that dictates everything else if you want to stick to your existing cabinet instead of purchasing a new one. There is typical widths for most houses (forty-eight inches for small baths, sixty inches for shared spaces, seventy-two/ eighty-four inches for master bathrooms). Plug those into the calculator above, and it will do all the math for you. This way, you don’t have to guess if those last four inches realy add usefulness or only make things look bulky.

How to Plan Your Double Vanity Space

The trick is understanding that vanity width isn’t enough. The page has a reference table showing how cabinet width affect the distance between the centers of two bowls. It also shows how it affects bowl size. But that’s not what matters. Usability depends on more than just width.

The second thing DIYers trip up on is centerline spacing. That’s the distance from one sinkhole to another. You need it to be far enough apart that your knees don’t bump into other person, but also close enough that you aren’t stretching too far to reach for soap. Generally speaking, with a sixty inch vanity, a thirty to thirty-four inch spread is good. It allows the sinks to feel like their own, while still connected. If you make it too wide, you lose the sense of being together in the space. If you make it too small, you will find yourself elbowing elbows first thing in the morning. That’s what most people are missing when they only look at pictures online.

The other overlooked spots are the side decks, those narrow stretches of counter alongside the outside bowls. That sweet spot is three to five inches. Enough room to wipe up water or even set down a toothbrush cup without feeling like it’s taking up too much space. Less than that and it seems like an afterthought. More than that, and you’re wasting valuable real estate that could go to a bigger mirror, or drawers. This tool actualy does this for you, alerting you to layouts where you’ll end up with slivers of wasted stone along the wall.

Mirrors gets some lovin’ too. On the math side of things, yeah it makes sense for them to be centered right above the drain in the sinks, but when they’re skinny it just ends up looking funny. Typically a two to six inch gap between two different mirrors works better than overlapping or touching. The eye has somewhere to rest and it also keeps the whole bathroom from feeling boxed in. For a single wide mirror, centering it on the total width of your vanity, even if it’s a little off-center in the reflection for one sink, is the move.

And then there are the drawers. Having a bank of drawers in the middle between the sinks is nice, that is, unless they’re pushing the bowls too close. To account for this, I added a little math that makes sure that whatever width drawer you choose doesn’t intrude into the common countertop area. Depending on how many drawers wide you’d like to go (and what depth those drawers are), you may want to reduce the bowl size or increase the spacing between the middle lines so everything still works. Elbow room vs. Storage is another tradeoff.

Ultimately, there is no rule book for a good vanity. There is only thinking about where two people realy will move in that little space. Think ahead. Measure twice, check your clearances, and know that comfort doesn’t come back from the store. Nail the spacing now and you’ll have less to get used to getting around each other later.