Match the cabinet width to your vanity — equal or slightly narrower — and center the height at about 64 inches off the floor.
Getting the size right comes down to two numbers: vanity width and the height of the people using the sink. Depth, door count, and mounting type follow from those. The chart below shows standard pairings, then the wall and clearance checks that decide whether a size that fits your vanity fits your bathroom.
What Size Medicine Cabinet Fits Your Vanity?
Pair cabinet width to vanity width so the cabinet reads as balanced above the sink. The standard guide is 15 x 24 inches for an 18–24 inch vanity, 20 x 24 inches for a 30–36 inch vanity, and 30 x 24 inches for a 42–48 inch vanity.
KOHLER groups the same range by room size: 16–24 inches for smaller bathrooms, 24–30 inches for medium, and 30–40+ inches for large bathrooms or double vanities. Both systems agree: the cabinet should be equal to or slightly narrower than the vanity below it.
Door count tracks width. Single-door units run about 14–16 inches wide, double-door 24–30 inches, triple-door 36–48 inches, with heights between 24 and 40 inches. For a 60-inch double-sink vanity, hang two smaller cabinets, one above each faucet, rather than one oversized unit.
| Vanity Width | Recommended Cabinet | Typical Door Count |
|---|---|---|
| 18–24 inches | 15 x 24 inches | Single door |
| 30–36 inches | 20 x 24 inches | Single or double |
| 42–48 inches | 30 x 24 inches | Double door |
| 60 inches (double sink) | Two smaller cabinets | One per faucet |
| Small bathroom (KOHLER) | 16–24 inches | Single door |
| Medium bathroom (KOHLER) | 24–30 inches | Double door |
| Large bathroom (KOHLER) | 30–40+ inches | Double or triple |
How High Should It Hang, And What Clearance Do You Need?
Guides center the cabinet about 64 inches from the floor, with a practical range of 60–65 inches — eye level for most adults. Leave at least 3 inches between the cabinet bottom and the faucet top, or the spout and handles will fight the doors. Measure your faucet’s actual height; tall gooseneck models eat that gap fast.
Weigh the cabinet against the whole wall, not just the vanity. Center it on the vanity, and if a light fixture or window sits above the sink, work the cabinet around them.
Recessed Or Surface Mount — Which One Changes The Sizing?
Recessed and surface-mount cabinets of the same face size need different wall conditions, which can rule out a size before you buy.
Older homes with shallow or oddly framed walls may not accept the size you want.
Surface-mount cabinets skip the framing question but eat walking space and may need extra hardware.
Before ordering, confirm wall cavity depth, stud spacing, and the mounting type the cabinet ships as. For a shortcut, our tested picks for the best bathroom medicine cabinet with mirror list mounting type and dimensions for each model.
Retail dimensions vary more than standard pairings suggest. Read the overall dimensions on the product page, not a rounded width, and check the KOHLER medicine cabinet sizing guide against your wall before you commit.
FAQs
Should the cabinet be the same width as the vanity or narrower?
Equal or slightly narrower. A cabinet wider than the vanity looks top-heavy and can crowd the faucet. If your vanity sits between two standard sizes, size down rather than up.
Can I install a recessed cabinet in any wall?
No. Recessed cabinets need enough cavity depth and framing between studs, usually 16 inches on center. Shallow exterior walls, walls with plumbing, or non-standard framing can rule out a recessed install — a surface-mount model is the safer pick.
What is the standard height for a medicine cabinet above the sink?
Most guides center the cabinet at 64 inches from the floor, with 60–65 inches as the working range. Go higher if the primary user is tall, and always leave at least 3 inches between the cabinet bottom and the faucet top.
References & Sources
- KOHLER. “Shop Medicine Cabinets.” Width ranges by bathroom size, recessed wall-opening specs, and surface-mount kit requirements.
- Home Depot. “Medicine Cabinet Buying Guide.” Standard vanity-to-cabinet width pairings, 64-inch mounting height, and double-sink guidance.
- West Elm. “Seamless Medicine Cabinet.” Current retail dimensions showing the real range of offered sizes.
