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What Size Mirror Do I Need for My Vanity?

Match a bathroom vanity mirror to vanity width, sink layout, and lighting clearance, with quick size guidance for common vanities.

Direct answer

Choose a vanity mirror that is narrower than the vanity, wide enough to cover the sink zone, and placed so faucets and lights do not crowd it. A practical starting point is to leave a few inches of vanity visible on each side instead of trying to match the vanity width exactly.

vanity width minus side reveal allowance, then branch into one-mirror or two-mirror layouts for double vanities
Calculator

Vanity mirror size calculator

Recommended mirror
42" mirror
Vanity width
in
Sink count
count
Visible vanity on each side
in
Clearance below light
in
Mirror layout
Single mirror
Target mirror width
42"
Typical top clearance
6" below lighting

One mirror usually looks cleanest. Keep the mirror narrower than the vanity and wide enough to cover the sink zone cleanly.

Vanity width to mirror width guide

24" to 30"

20" to 26" mirror

Single mirror is usually best

36" to 42"

30" to 36" mirror

Single mirror often still works

48" to 54"

40" to 48" mirror

Choose based on light and sink spacing

60" to 72"

52" to 66" single mirror

Two mirrors often look cleaner

Why mirror width alone is not enough

A mirror can be the right width and still install badly if the sconces, faucet, backsplash, or medicine-cabinet depth were ignored. That is why the page gives a width recommendation and a placement check instead of pretending the job is solved by one number.

Placement checks that matter

  1. 1Center the mirror over the sink zone rather than the whole countertop if the layout is asymmetrical.
  2. 2Leave enough clearance for faucets, backsplashes, and the bottom edge of lighting.
  3. 3Choose two mirrors more often on double vanities when each sink has its own light.
  4. 4Do not size the mirror so wide that it competes with trim, sconces, or side walls.

FAQ

What size mirror for a 30 inch vanity?

A 30 inch vanity often pairs well with a mirror around 22 to 26 inches wide. That keeps the mirror narrower than the vanity while still covering the sink zone cleanly.

What size mirror for a 60 inch double vanity?

A 60 inch double vanity can work with one wider mirror or two smaller mirrors. Two mirrors are often cleaner when each sink has its own light and wall space.

Should a bathroom mirror be the same width as the vanity?

Usually no. A mirror that is slightly narrower than the vanity tends to look more proportional and leaves room for lighting, trim, and wall clearance.

Sources & method

We reviewed these references while writing this answer. Figures are estimates — confirm safety-critical work with a professional. Last updated June 7, 2026.