Medicine Cabinet Sizes: Standard Dimensions & How to Choose the Right Fit

Standard medicine cabinet sizes range from 15 to 48 inches wide, 24 to 36 inches tall, and 4 inches deep. The most popular size is approximately 24 inches wide by 30 inches tall. To choose the right medicine cabinet size, match the cabinet width to your vanity and aim for a cabinet at least 1 inch to 3–5 inches narrower than the vanity on each side so the door opens freely.

Shop LED medicine cabinets with mirrors at Allsumhome →

What Is the Standard Medicine Cabinet Size?

A standard medicine cabinet is a wall-mounted storage cabinet installed above a bathroom vanity or sink. The standard medicine cabinet dimensions are 24 inches wide, 30 inches tall, and 4 inches deep, but the full range spans from compact 15-inch powder room models to wide 96-inch double-vanity configurations.

Here is a quick-reference breakdown of standard medicine cabinet dimensions: 

Most homeowners use 24" × 30" × 4" as their planning baseline, then adjust based on vanity size, bathroom layout, and storage needs. Larger bathrooms with double sinks typically require 36–48-inch wide cabinets, or a pair of 20–26-inch cabinets mounted above each sink area.

How to Size a Medicine Cabinet to Your Vanity Width

The vanity width is your most important measurement. Your medicine cabinet should be at least 2 inches narrower than the vanity on each side. This ensures the door opens a full 90 degrees without hitting a wall, tile edge, or adjacent surface. For a 30-inch vanity, that means choosing a 24–26-inch cabinet. For our Illusion and Illusion-B series with wide-opening doors, leave 5–8 inches of side space to avoid collision with tiles, walls or adjacent cabinetry. 

Use this table to find the right cabinet width for your vanity: 

Double vanity sizing

For double-vanity bathrooms, two individual cabinets (one above each vanity basin) are generally preferable to a single large cabinet spanning both sinks. Two cabinets improve symmetry, provide each person with independent storage access, and distribute lighting more evenly if you choose lighted models. A common pairing for a 72-inch double vanity is two 30-inch wide cabinets with approximately 2–4 inches of spacing.

Medicine Cabinet Height: Installation & Clearance Rules

Getting the height right means balancing three constraints: clearance above the faucet, clearance below the light fixture, and a comfortable mirror-viewing height for the people using it.

Standard installation height

Install the cabinet so its vertical center sits 64 to 72 inches from the finished floor. At this range, the mirror face aligns with eye level for most adults. For households with significant height variation, 68 inches from the floor to the cabinet center is a reliable default.

Clearance above the faucet

Leave a minimum of 5 inches between the top of the faucet (or countertop backsplash) and the bottom edge of the cabinet. This keeps water splashes away from the cabinet frame and provides comfortable hand clearance at the sink.

Clearance below light fixtures

If you have overhead lighting directly above the vanity, measure the vertical distance from the bottom of the fixture to the finished floor/countertop. The result tells you the maximum cabinet height that will fit without crowding the light. When in doubt, size down on height and up on width to maintain storage capacity.

Cabinet height options

• Standard (24–30 inches tall): Fits the majority of bathroom configurations. Works under most overhead fixtures without clearance issues.
• Tall (34–40 inches tall): Delivers a larger uninterrupted mirror surface and significantly more shelf storage. Best for bathrooms with no overhead fixture directly above the vanity, or rooms with 9-foot or higher ceilings. Note that tall medicine cabinets reduce the safe 5-inch clearance gap between cabinet base and faucets. It is important to lower overall mounting height when selecting tall models to avoid installation issues.

Recessed vs. Surface-Mount: How Installation Type Affects Size

How your cabinet mounts to the wall determines the available size options. For a detailed comparison of installation methods, see our recessed vs. surface-mount medicine cabinet guide.

Recessed mount sizing

A recessed cabinet is installed inside the wall cavity and sits flush with the wall surface. It adds no projection depth (outward depth sticking out from wall) to the room — the right choice for smaller bathrooms where every inch of floor space matters. It should be noted that recessed medicine cabinets rely on hollow cavity space inside 2×4 or 2×6 wall frames; they cannot be installed on solid/non-hollow walls.

Sizing constraints to know: 

• Width is limited by stud spacing. Standard framing with 16-inch on-center studs leaves 14.5 inches of clear space between studs. Single-stud-bay recessed cabinets are typically 14–15 inches wide. Wider recessed models (24 inches or more) require the wall to be framed with a custom header during a renovation.
• Depth is limited to 3.5 inches in standard 2×4-framed walls. In special conditions, homes with 2×6 framing can accommodate up to 5.5 inches of recessed depth.
• Not possible where pipes, wires, or blocking run through the target wall cavity. Check before cutting.

Surface-Mount Sizing

A surface-mount cabinet hangs directly on the wall. Because nothing is cut into the wall, there are no stud-spacing or depth constraints. You can choose any width in the product range without framing changes.

• Width: No structural limit (standard range is 14–96 inches). It should be noted that large surface-mount cabinets measuring 48 inches and wider must be anchored directly into wall studs for structural support, to prevent falling hazards during use.
• Depth: 4–6 inches, depending on model.
• The cabinet projects from the wall by its full depth. In narrow bathrooms, confirm that the open door (which extends beyond the cabinet body) does not create a clearance issue with the toilet, shower glass, or entry door.

Sizing a Medicine Cabinet with Mirror and Lights

A medicine cabinet with a mirror and lights introduces sizing variables that a basic cabinet does not. The LED lighting system, built-in electrical components, and mirror specifications each affect how the cabinet fits and performs in your space.

Plan around your lighting layout

If you plan to add wall sconces on either side of the cabinet, leave 5 to 6 inches of clear space between the cabinet's outer edge and each sconce. This eliminates shadow zones at the sides of your face and ensures the cabinet door clears the sconce hardware when fully open.

If your bathroom uses overhead lighting only, you have more flexibility with width and can size the cabinet closer to the vanity width without concern about sconce clearance.

Built-in outlet and USB port placement

Allsumhome's LED medicine cabinets include a built-in 1800W electrical outlet and USB ports inside the cabinet — a feature that competitors' standard models do not include. When sizing, note that the outlet typically sits at the rear of the bottom shelf. Cabinets narrower than 20 inches have less interior clearance around the outlet; models 24 inches and wider provide comfortable access without crowding other stored items.

LED specifications and what they mean for sizing

Allsumhome lighted medicine cabinets use CRI 90+ LED strips with color temperature adjustable from 3000K to 6000K — warm white for evening routines, bright cool white for makeup and grooming. Anti-fog mirror glass is standard across the lighted range.

These components are integrated into the cabinet frame and do not require additional clearance beyond the standard installation rules above. However, for recessed installations specifically, always check the listed external depth of the LED cabinet (not just mirror depth), as the LED driver and wiring add a small amount to the frame assembly compared to non-illuminated models.

Soft-close hinges and door swing clearance

Lighted Allsumhome cabinets include soft-close hinges. At 90 degrees open, the door extends outward from the wall by a distance equal to the cabinet's depth — typically 4–6 inches on surface-mount models. Factor this into your layout if the vanity is positioned close to a wall, shower enclosure, or interior door.

For pairing a lighted medicine cabinet with a matching illuminated mirror, see our LED vanity mirror buying guide for guidance on sizing and positioning.

Browse lighted medicine cabinets at Allsumhome →

Medicine Cabinet Sizes by Bathroom Type

Bathroom size and configuration: which medicine cabinet dimensions make the most sense? Here is how to approach sizing for the three most common setups.

Powder room (half bath)

Powder rooms typically feature an 18–24-inch pedestal sink or small vanity and limited wall space. A compact cabinet with a width of 14–20 inches works best. Prioritize height over width to maximize shelf storage without overwhelming the wall.

If illumination is not a priority in a powder room, medicine cabinets without lights are available in narrow configurations, 14 inches wide, and can be surface-mounted over any wall material without electrical work.

Single-sink bathroom

The most common bathroom configuration. Match the cabinet to your vanity using the sizing table above. For a 30-inch vanity, a 24–26-inch wide cabinet is the standard recommendation. A 24-inch wide by 30-inch tall LED medicine cabinet — recessed or surface-mounted — covers the vast majority of single-sink installations and provides enough shelf depth for everyday toiletries, medications, and grooming tools.

Primary bathroom with double vanity (60–72 inches)

Double-vanity setups offer two sizing approaches — one wide cabinet spanning the full vanity, or two individual cabinets with one above each vanity basin. For most primary bathrooms, two individual cabinets are the better choice. They maintain visual symmetry on both sides of the room, allow independent door access without one person blocking the other, and — if choosing lighted models — distribute illumination evenly at both sink positions rather than concentrating it from a single central source.

A well-matched configuration for a 72-inch double vanity: two 30-inch wide LED medicine cabinets, centered above each sink, with 10–12 inches of wall space between them.

Frequently Asked Questions

1. What sizes do medicine cabinets come in?

Medicine cabinets come in widths of 15 to 96 inches, heights of 24 to 40 inches, and depths of 3.5 to 6 inches. The most common standard size is 24 inches wide by 30 inches tall by 4 inches deep. Compact 14–15-inch models are available for powder rooms; double-vanity setups typically use 36–48-inch-wide cabinets or a pair of 20–26-inch cabinets side by side.

2. How big should a medicine cabinet be compared to a vanity?

A medicine cabinet should be at least 1 inch narrower than the vanity on each side so the door opens to a full 90 degrees without obstruction. For a 30-inch vanity, choose a 24–26-inch wide cabinet. Matching the vanity width exactly is sometimes possible, but it risks the door hitting an adjacent wall, tile surround, or decorative panel, depending on your layout.

3. What size medicine cabinet should I get for a 72-inch vanity with a mirror?

For a 72-inch double vanity, the two most practical options are two 28–32-inch cabinets — one above each vanity basin — or one 60–66-inch wide cabinet spanning the full vanity. Two individual cabinets are generally preferred — they improve symmetry, provide independent storage for two users, and deliver more even lighting at each sink position when lighted models are used.

4. What is a good depth for a medicine cabinet?

Four inches is the standard depth for surface-mount cabinets and comfortably fits most bathroom layouts. Recessed models installed between standard 2×4 wall studs have a usable depth of approximately 3.5 inches. Surface-mount cabinets can reach 5–6 inches, which adds meaningful interior shelf space — enough to store full-size bottles and grooming tools upright — without requiring any wall work.

5. Are lighted medicine cabinets still in style?

Yes. LED medicine cabinets with integrated mirrors and lighting are one of the most popular bathroom upgrade categories in 2026, and the trend shows no sign of reversing. The combination of anti-fog mirror glass, adjustable color temperature from 3000K to 6000K, and a built-in 1800W outlet makes lighted cabinets significantly more functional than a plain mirror paired with separate sconces — while delivering the clean, spa-like look that dominates contemporary bathroom design.

6. What are the two types of medicine cabinets?

The two main installation types are recessed and surface-mount. Recessed cabinets get installed within the wall cavity for a flush, built-in appearance, which is ideal for smaller bathrooms where wall projection matters. Surface-mount cabinets attach directly to the wall surface, require no wall cutting, and offer more size and placement flexibility, including installation over tile or walls with plumbing and wiring behind them.

7. Does a medicine cabinet have to match a vanity?

No, but it should be proportional to the vanity width (see the sizing table above) and visually coordinate with the hardware finish. A practical approach is to match the cabinet frame or handle finish to the vanity faucet and drawer pulls rather than the vanity cabinet color. In LED medicine cabinets, the illuminated mirror becomes the dominant visual element, making finish coordination less critical than proper placement and sizing.