A 48"×32" medicine cabinet is one of the largest sizes commonly available, and it's built for double vanities or a single wide vanity where you want one continuous mirror and storage run instead of two smaller cabinets. At 32" tall, it also gives plenty of vertical mirror space for taller households.

• Ideal for double-sink vanities 44"–54" wide
• Needs a clear, unobstructed wall span — confirm stud layout before a recessed install
• Pairs well with a wide vanity light bar or two symmetrical sconces

The 40"×32" size is a popular middle ground for double vanities that don't need the full 48" width — it comfortably spans two sinks set closer together while still giving each person a wide reflection and generous interior storage.

• Great fit for double vanities 36"–44" wide
• 32" height suits vanities set at standard or slightly raised counter heights
• Check your rough opening depth if going recessed — larger cabinets sometimes need added blocking

A 36"×32" cabinet works two ways: as a bold, oversized statement piece over a single large vanity, or as a shared cabinet over a compact double vanity where the sinks sit close together. The extra height (32") is especially useful in bathrooms with tall ceilings or a taller-than-average household.

• Fits single vanities 36"–42" wide, or tighter double vanities
• 32" height leaves room for a below-cabinet backsplash or tile accent
• Popular size for both recessed and surface-mount installs

The 30"×26" size is a step up from a standard single-vanity cabinet, giving a slightly wider mirror and more shelf space without moving into double-vanity territory. It's a strong choice if your vanity runs on the wider side of "single" (30"–36") but you don't want an oversized-feeling cabinet.

• Best for single vanities 28"–34" wide
• 26" height keeps proportions balanced over a standard-height vanity light
• A common size for both budget and lighted cabinet models

At 24" wide but 32" tall, this size is built for bathrooms where vertical mirror space matters more than width — think narrower vanities with higher ceilings, or a look where the cabinet reads more like a full mirror than a wide storage box.

• Fits single vanities 22"–28" wide
• Extra height is great for taller users or a more dramatic mirror look
• Works well flanked by vertical sconces rather than a horizontal light bar

The 20"×32" size keeps the footprint narrow — ideal for tighter powder rooms or pedestal sinks — while still delivering a tall mirror for full-face grooming and makeup application. It's one of the better choices when wall width is limited but you don't want to sacrifice mirror height.

• Great for pedestal sinks and compact single vanities (18"–24" wide)
• 32" height compensates for the narrower width
• Check ceiling height and vanity light placement so the taller cabinet doesn't crowd the fixture

20"×26" is the classic, go-to size for a standard single vanity — it's the size most people picture when they think "medicine cabinet." It fits the widest range of bathrooms without looking oversized or undersized, which is why it tends to have the deepest selection of finishes and features.

• Fits most single vanities 24"–30" wide
• Balanced proportions for both recessed and surface-mount installs
• Usually the size with the most style, finish, and lighting options to choose from

The 16"×24" size is the go-to for small bathrooms, powder rooms, and pedestal sinks where wall space is at a premium. It's compact enough to fit almost anywhere while still offering enough interior storage for daily essentials.

• Best for powder rooms, half baths, and pedestal or corner sinks
• Easiest size to recess into a standard stud bay with minimal cutting
• A popular starter size for budget-friendly and entry-level cabinet lines