Getting the right size mirror for your bathroom vanity is part art and part science. A mirror that’s too small can feel awkward, while one that’s too big might overwhelm the space or interfere with lighting and outlets.

Here’s how to choose the best size mirror to go over your vanity for a balanced, functional, and stylish look.

General Sizing Guidelines

• The mirror should be 2 to 4 inches narrower than your vanity on each side.
• For a 36” vanity, look for mirrors between 28” and 32” wide.
• The height depends on ceiling height and lighting placement, but 30–36” tall is a common range.

Single vs. Double Vanity

• For single vanities: One centered mirror is usually best.
• For double vanities: Choose either one large mirror that spans both sinks or two smaller mirrors, one above each sink.

Other Tips

Make sure the mirror doesn’t extend past the vanity edges.

Leave space above the faucet for the mirror to sit comfortably.

Consider lighting — sconces or overhead lights may impact the ideal mirror size.

Final Thoughts

A well-proportioned mirror ties your whole vanity area together. Use painter’s tape to map out different sizes on your wall to visualize the best fit before you buy.