A bathroom mirror should be 2 to 4 inches narrower than the vanity below it, so a 24-inch vanity takes a mirror 20–22 inches wide.
A mirror as wide as the vanity can work, but the frame then sticks out past the edges. Measure to the frame’s outside edge: a 30-inch glass with a 2-inch frame takes 34 inches.
24-Inch Vanity Mirror
A bathroom mirror should be about 2 to 4 inches narrower than the vanity below it. For a 24-inch vanity, that means a mirror 20–22 inches wide.
Every size in this guide comes from that same rule. The narrower mirror leaves a little counter showing on each side, so the pair looks planned instead of squeezed together.
A mirror that matches the vanity width exactly can work, but I’d skip it on a small vanity.
You lose the breathing room, and any frame you add will stick out past the edges. Stay with 20–22 inches and a frame fits easily.
Before you order, check the vanity’s widest point and pick a mirror that sits inside it.
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30-Inch Vanity Mirror
A 30-inch vanity looks best with a mirror that’s 26–28 inches wide.
That leaves a couple of inches of cabinet showing on each side, so the glass doesn’t crowd the walls. This is the classic guest bath setup, and one centered mirror is all it needs.
The standard 24" x 36" mirror is a little narrow here. It works, but it can look small over the cabinet.
The 30" x 36" is the other common size, and it runs the full width of the vanity. I’d only pick it for a deliberate wall-to-wall look with no side lights to fit.
If you want a mirror in between, look for one that’s 26–28 inches wide. Height is flexible, and 30–40 inches shows your head and shoulders well.
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Mirror Size for a 36-Inch Vanity
For a 36-inch vanity, aim for a mirror 30–34 inches wide. That keeps the glass a few inches narrower than the cabinet, which is the proportion that looks balanced.
A 30" x 36" mirror is a common fit.
At 30 inches wide, it leaves about 3 inches of vanity showing on each side. It looks full without crowding the walls.
A mirror as wide as the vanity can look squeezed in. If you want sconces (wall lights) beside the glass, stay on the narrower end so they have wall to land on.
Frames count too. A 30-inch glass with a 2-inch frame takes up 34 inches of wall, so measure to the outside edge before you buy.
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48-Inch Vanity Mirror
A 48-inch vanity looks best with a mirror 36–44 inches wide. That leaves a few inches of counter showing on each side, so the mirror sits inside the vanity instead of crowding its edges.
The two standard sizes are 48" x 36" and 36" x 48", width listed first. For a wide, single-sink vanity, I’d pick the 48" x 36" landscape version.
It follows the long line of the cabinet and gives you a broad view. The 36" x 48" portrait style is tall and narrow, so it suits a single sink best when the wall is short on width.
If you choose the 48-inch width, it runs flush with the vanity.
That works, but it gives the wall less breathing room. I’d stay a little under it.
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60-Inch Vanity Mirror
For a 60-inch vanity, pick a mirror 54–58 inches wide, or two mirrors at 26–28 inches each. That leaves a few inches of bare counter on each side, which looks intentional.
One wide mirror works best on a single-sink 60-inch vanity, or when you want a clean, frameless look.
Without a wall between sinks, though, you can’t hang a sconce there. You’ll need overhead light.
Over two sinks, I’d go with two mirrors. At 60 inches the sinks sit close together, and one big sheet of glass makes that tightness obvious.
Two mirrors give each person a spot. They also leave gaps for sconces, and you hang each one to its own sink, so a wall that’s a little crooked won’t show.
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72-Inch Vanity Mirror
A 72-inch vanity is the one size where you get a real choice. A single mirror should run 66–70 inches wide, or you can hang two mirrors at 32–34 inches each.
Mirrors that wide are hard to find, and the few you do see tend to cost more and ship in oversized boxes. That alone pushes many people toward a pair.
I’d go with two. Each person gets their own spot at the sink, and two mirrors in the 28–32 inch range look more balanced over a wide vanity than one long slab.
Leave a few inches of wall between them. Round or oval shapes almost always look better as a pair, too.
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Mirror Height and Mounting
Two numbers decide how high to hang a mirror. Here’s how I’d set them:
- A mirror that’s 30–40 inches tall fits most vanities and works with the heights below.
- Keep the bottom edge 5 to 10 inches above the countertop. That clears the faucet, soap dispenser and toothbrush cup.
- With a backsplash, start measuring from its top, not the counter. Skipping this is the most common mistake.
- Aim for the mirror’s center at about 60–65 inches from the floor. That’s eye level for an average adult.
- In a home with tall and short users, split the difference or favor the person who uses the sink most.
- Test it: you should see your whole face without stooping or rising on your toes.
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Mirror Shape
Rectangular is the safe pick, and I’d start there for most vanities.
It matches the straight lines of a countertop and cabinet, and you can use nearly the full width rule: a mirror around 70–80% of the vanity width, never wider than the vanity itself.
Round, oval and arched mirrors cost you some width. A round mirror’s diameter should be about the vanity width minus 4 inches, so a 26-inch round fits a 30-inch vanity.
Round softens a bathroom full of square tile and hard edges. A tall oval adds height in a low room.
Arched mirrors are flat at the bottom and curved on top, so size them like rectangles. They suit traditional and farmhouse rooms, but I’d skip them in a very minimalist space, where the arch can feel formal.
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Lighting Beside the Mirror
Sconces need wall space, and the mirror decides how much you get. Keep the glass inside the vanity width and the fixtures have a place to land on each side.
A mirror that runs wall to wall leaves no spot for them, so that look works only if you plan overhead light instead.
Mount sconces at eye level, which puts the light on your face instead of above it. A mirror’s center lands near 60–65 inches off the floor, so line the fixtures up around that height.
Measure to the outside of the frame, not the glass.
A frame adds roughly 1 to 3 inches per side, so a 30-inch glass with a 2-inch frame takes up 34 inches of wall. I’d tape the frame size on the wall first, then mark the sconces.
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One Mirror or Two Over a Double Vanity
Both work on a double vanity, and the choice mostly comes down to lighting and looks.
One wide mirror feels clean and open. Two mirrors, one centered over each sink, give each person a station and leave a gap in the middle for a sconce (a wall light) at eye level.
I lean toward two mirrors on a 60-inch vanity, where one wide mirror makes the sinks look cramped.
On a 72-inch vanity, a pair at 28–32 inches each also looks more balanced. Round or oval shapes almost always look better as a pair.
Whichever you pick, keep the mirror no wider than the vanity. For one mirror on a 60-inch cabinet, 54–56 inches is common.
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Frequently Asked Questions
What size mirror should I use for a 36-inch vanity?
Go with a mirror 30–34 inches wide.
That keeps the glass a few inches narrower than the cabinet, so some counter shows on each side. A 30" x 36" mirror is a common fit and leaves about 3 inches of vanity on each side.
How high should a bathroom mirror be hung above the vanity?
Keep the bottom edge 5 to 10 inches above the countertop, and measure from the top of the backsplash if you have one.
Then aim for the center of the mirror to land about 60–65 inches from the floor. That clears the faucet and puts the glass at eye level for an average adult.
Should a bathroom mirror be wider than the vanity?
No, a mirror a few inches narrower than the vanity looks more balanced.
Wall-to-wall glass only works as a deliberate look with no side sconces. If you want lights beside the mirror, keep the glass inside the vanity width so the fixtures have wall to land on.
