Vanity Size Calculator
Find the right vanity size for your bathroom. Enter your wall space and needs to get a recommended width, depth, and sink count, a clearance check against NKBA guidelines, and a downloadable PDF planning guide.
| Vanity Width | Sink Capacity | Counter Space | Storage Feel | Fits Your Wall | Verdict |
|---|---|---|---|---|---|
| Calculate to see options | |||||
Calculate to see options
How to Use the Vanity Size Calculator
Turn your wall measurements into a specific vanity to shop for — width, depth, height, sink count and a clearance check — in four steps.
Measure the wall and the floor
Choose wall-to-wall or open wall, then enter the available wall width and the floor depth from that wall out to whatever faces it. Both numbers matter — one decides what fits, the other decides whether you can stand there.
Reserve the space you can’t use
Add a side gap for each end and an obstacle reserve for a door swing, radiator or run of trim. Both come off the usable width before any vanity size is suggested, which is where most tape-measure plans go wrong.
Set sinks, height and depth
Leave sinks on auto and the calculator picks single or double based on what actually fits, or force one and see whether your wall supports it. Then choose standard or comfort height and a shallow, standard or deep cabinet.
Check clearance and save the PDF
Set your target standing space in front, then open the size table to see every standard width scored against your wall. Download the two-page guide with the clearance comparison before you order anything.
What’s Included
A vanity that fits the wall can still be the wrong vanity. This checks the width, the standing space in front and the sink count together.
A real size, not a range
The recommendation lands on an actual manufactured width — 24, 30, 36, 42, 48, 60 or 72 inches — because that’s what’s on the shelf. No rounding to a number nobody sells.
Honest double-sink advice
Two basins need real elbow room. Ask for a double on a narrow wall and the result says so plainly — a tight double, or a single instead — rather than squeezing in something you’ll regret using.
Clearance checked, not assumed
Cabinet depth plus countertop overhang comes out of your floor depth, and what’s left is compared against the recommended 30 inches and the 21-inch code minimum. The result is colour-coded so you can’t miss a fail.
Where every inch of the wall goes
Vanity, side gaps, obstacle reserve and leftover space shown as bars and a doughnut. If a chunk is being lost to a door swing, you’ll see exactly how much before you shop.
Every standard width scored
The comparison table rates all seven common sizes against your wall — sink capacity, counter area, storage feel and whether it fits at all — so you can see what you’d gain or lose by going one size either way.
Branded PDF planning guide
Two pages with the full space breakdown, the size options table and a clearance sheet comparing your numbers against recommended and minimum figures — useful with a showroom or a contractor.
By the Numbers
What the calculator models and the guidelines behind it.
24″ through 72″
comfortable minimum
NKBA recommendation
typical code minimum
no sign-up needed
Built for the Moment Before You Order
A vanity is heavy, boxed and often non-returnable once it’s out of the packaging. Getting the width right is a five-minute job that saves a very bad afternoon.
Anyone about to buy a vanity
You’ve found one you like and you’re hovering over the size dropdown. Check it against your wall first, including the door swing, so the box that arrives is the box that fits.
Households arguing about two sinks
Everyone wants a double until they use one that’s too narrow. Enter your wall and find out whether yours genuinely supports two basins or whether one sink with more counter is the better room.
People planning a small bathroom
In a tight room the vanity fights the door, the toilet and the walking space. Test a shallower cabinet or a narrower width and watch the front clearance change before you commit to a layout.
The Wall Is Never as Wide as You Think
Seven things that decide whether the vanity you order is the vanity you can install.
- 1Measure to finished walls, at floor level and at counter height. Tile, baseboard and out-of-plumb framing all steal width, and older walls are rarely parallel. Use the smallest number you get, then keep an install tolerance on each side so you’re not shaving a cabinet on site.
- 2Find the plumbing rough-in before you choose a width. The drain and supply lines are already in the wall, and an off-centre rough-in can rule out a vanity whose sink sits somewhere else. Moving them is real plumbing work, so it’s worth knowing before you fall for a size.
- 3Doors and drawers need room the tape measure doesn’t show. A cabinet that fits the wall can still be blocked by a door swing, a toilet or a towel radiator. Add that space to the obstacle reserve above, and check that the vanity’s own drawers can open fully once it’s in.
- 4A double sink needs about 60 inches to be worth having. Below that the basins crowd each other, the counter between them disappears and two people still can’t use it at once. In a 48 to 59 inch space, a single sink with generous counter usually functions better than a squeezed pair.
- 5Protect the standing space in front. Thirty inches from the vanity face is the comfortable target and around 21 inches is the usual code floor. Depth and overhang both eat into it, so a deeper cabinet in a narrow room can quietly push you under the line.
- 6Pick the height for who actually uses the room. Comfort height at 36 inches saves most adults from stooping; the traditional 32 inches suits children and shorter users better. It’s a small difference on paper and an everyday one in practice.
- 7In an open-wall layout, leave a deliberate gap. A vanity that stops an inch short of a wall looks like a mistake; one that stops several inches short looks like a decision. If you’re not filling the run wall to wall, make the space on each side generous and equal.
Frequently Asked Questions
Answers to the most common questions about vanity widths, depths, heights, sink counts and clearances.
What size vanity do I need?
Start with the wall width, then subtract anything you can’t build into — a door swing, a radiator, the trim — and a small gap at each end. What’s left is your usable width, and the largest standard vanity that fits inside it is usually the right answer. The second test is the floor: cabinet depth plus overhang has to leave comfortable standing space in front. Enter both measurements above and the calculator applies both tests at once.
What are the standard bathroom vanity sizes?
Widths are generally sold in fixed steps — 24, 30, 36, 42, 48, 60 and 72 inches are the common ones, with the smaller sizes suiting powder rooms and the largest reserved for double-sink installs. Depth is typically around 21 inches, with shallow 18-inch cabinets for tight rooms and 24-inch versions for maximum drawer storage. Heights cluster around a traditional 32 inches and a comfort height near 36. The size table above scores all seven widths against your own wall.
How wide does a double sink vanity need to be?
Sixty inches is the usual comfortable minimum, and 72 gives each person genuine space. Doubles are made at 48 to 59 inches, but at that width the basins sit close together, there’s almost no counter between them and two people using it at once still bump elbows. If your wall is in that band, a single sink with wide counter and more drawer space is often the better bathroom. Set sinks to auto above and the calculator makes that call from your measurements.
How much space do I need in front of a vanity?
Around 30 inches of clear floor in front of the vanity is the widely recommended target — enough to stand, bend and open a drawer without backing into anything. Building codes commonly set the floor lower, near 21 inches, which is workable but tight. Remember the measurement runs from the front edge of the countertop, not the cabinet, so the overhang counts. The calculator subtracts depth and overhang from your floor measurement and flags the result green, amber or red.
What height should a bathroom vanity be?
Two heights dominate. The traditional height sits around 32 inches and suits children and shorter adults, which is why it’s still common in family and hall bathrooms. Comfort or counter height is closer to 36 inches and means most adults aren’t leaning over to wash their face — easier on the back and now the more popular choice for primary bathrooms. Pick for the people who use the room daily rather than for resale, and note that the finished height includes the countertop.
How deep should a vanity be?
Around 21 inches is standard and works for most bathrooms. A shallow cabinet near 18 inches buys back precious floor space in a narrow room, at the cost of smaller drawers and a tighter basin. Deeper cabinets around 24 inches give the most storage and the most generous counter, but they push the standing space in front the wrong way. Switch between the three above and watch the front clearance figure move — that trade-off is the whole decision.
Does the vanity have to fill the whole wall?
No, and there are two different approaches. A wall-to-wall install fills the run between two side walls, which maximises storage and looks built-in — you only need a small tolerance at each end for out-of-square walls and easier fitting. An open-wall layout leaves a deliberate gap on each side, which suits freestanding and floating vanities and makes a small room feel less packed. Choose the install type above and the side gap guidance adjusts accordingly.